The URL can be used to link to this page

Home My WebLink About2007-004 RESOLUTION NO. 2007-004 Wo A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF ATASCADERO, CALIFORNIA, CERTIFYING CITY HALL REHABILITATION PROJECT MITIGATED NEGATIVE DECLARATION PLN 2004-0141 (Applicant: City of Atascadero) WHEREAS, the City Council of the City of Atascadero, Atascadero, CA directed staff to pursue grant funding for the repair and rehabilitation of City Hall following the December 2003 San Simeon Earthquake; and, WHEREAS, staff has applied for and received approval of the California Cultural and Historical Endowment (OCHE) State grant for funding the repair and rehabilitation of City Hall; and WHEREAS, an Initial Study and Draft Mitigated Negative Declaration 2006-0031 were prepared for the project and made available for public review in accordance with the requirements of the California Environmental Quality Act (CEQA); and, WHEREAS, The Draft Mitigated Negative Declaration incorporates professional consultation that meets the Secretary of Interior's Professional Qualifications Standards for Historic Architecture, Historic Preservation Planning and/Architecture History per the Code of Federal Regulations, 36 CDF part 61 and, WHEREAS, the laws and regulations relating to the preparation and public notice of environmental documents, as set forth in the State and local guidelines for implementation of the California Environmental Quality Act(CEQA)have been adhered to; and, WHEREAS, the City Council of the City of Atascadero convened on January 23, 2007; and, NOW, THEREFORE, the City Council of the City of Atascadero, hereby resolves to take the following actions: SECTION 1. Certification. The City Council does hereby certify City Hall Rehabilitation and Rehabilitation Project Mitigated Negative Declaration 2006-0038 as identified in Exhibit A. Exhibit A: Mitigated Negative Declaration 2006-0038 am City of Atascadero Resolution No. 2007-004 Page 2 of 3 On motion by Council Member O'Malley and seconded by Council Member Clay, the foregoing Resolution is hereby adopted in its entirety on the following roll call vote: AYES: Council Members Beraud, Brennler, Clay, O'Malley and Mayor Luna NOES: None ABSENT: None ABSTAIN: None ADOPTED: January 23, 2007 CITY OF ATASCADERO 7 By: LL Mike Brennler, Mayor Pro Tem ATTEST: Marcia McClure Torgerson, C.M.C., City Clerk J APPROVED AS TO FORM: Patri t, City Attorney am City of Atascadero Resolution No. 2007-004 Page 3 of 3 EXHIBIT A: Draft Mitigated Negative Declaration WAW Exhibit available for review at the City Clerk's Office. aw INITIAL STUDY/MITIGATED NEGATIVE DECLARATION ATASCADERO CITY HALL REPAIR PROJECT Lead Agency: City of Atascadero Environmental Consultant: Padre Associates, Inc. 811 EI Capitan Way, Suite 130 San Luis Obispo, CA 93401 Project No. 0602-2391 December 2006 associates, inc. ENGINEERS, GEOLOGISTS & ® ENVIRONMENTAL SCIENTISTS Start Here Project Description Applicant: City of Atascadero, City Hall Annex, 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Project Title: Atascadero City Hall Repair and Rehabilitation Project Project Atascadero City Hall, 6500 Palma Avenue, Atascadero, CA 93422 Location: Project The project consists of a series of actions for the repair, maintenance, and rehabilitation of Description: Atascadero's City Hall. The project would occur in three phases. Funding for each phase of the project is derived from separate sources. Funding for the first phase of the project would come from a State grant. The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall within seven major categories of work, as follows_ • Exterior cladding; • Roofing, waterproofing, and skylights; • Interior partitions, doors, and glazing; • Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation, and air conditioning repairs; and, • Electrical lighting, power, and communication repairs. i aoz� CITY OFATASCADERO CEQA REFERRAL REQUEST FOR COMMENTS Community Development Department 6905 EI Camino Real, Suite 6 Atascadero, CA 93422 (805) 461-5000 Date: December 14, 2006 State Clearinghouse Atascadero Mutual Water Company San Luis Obispo Air Pollution Control District San Luis Obispo Environmental Health Department Atascadero Unified School District SLO County Sheriffs Dept. SLO County Assessor's Office From: Steve McHarris, Deputy Community Development Director 11 The attached Proposed Mitigated Negative Declaration is referred for your Agency's review and comment. The public review period for this project runs from December 15, 2006 through January 17, 2007. Mitigated Negative Declaration 2006-0038 and Initial Study. CITY OF ATASCADERO COMMUNITY DEVELOPMENT DEPARTMENT CITY OF ATASCADERO NOTICE OF INTENT TO ADOPT MITIGATED NEGATIVE DECLARATION AND CITY COUNCIL PUBLIC HEARING NOTICE IS HEREBY GIVEN that the City Council will be holding a public hearing to consider the following project and environmental determination. The public is encouraged to attend. Applicant: City of Atascadero, City Hall Annex, 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Project Title: Atascadero City Hall Repair and Rehabilitation Project Project Atascadero City Hall, 6500 Palma Avenue, Atascadero, CA 93422 Location: APN — 029-345-001 Project The project consists of a series of actions for the repair, maintenance, and rehabilitation of Description: Atascadero's City Hall. The project would occur in three phases. Funding for each phase of the project is derived from separate sources. Funding for the first phase of the project would come from a State grant. The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall within seven major categories of work, as follows: • Exterior cladding; • Roofing, waterproofing, and skylights; • Interior partitions, doors, and glazing; Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation, and air conditioning repairs; and, • Electrical lighting, power, and communication repairs. Fd.: 0602-2791 A—da. Cuy Hill ISMND PIrm Dar. 1214/061:26 PM 6905 EL CAMINO REAL, SUITE 6 • ATASCADERO, CALIFORNIA 93422 (805) 461-5000 • FAX 461-7612 CITY OF ATASCADERO CERTIFICATE OF FEE EXEMPTION 6905 EI Camino Real, Suite 6 Atascadero, CA 93422 (805) 461-5000 De Minimis Impact Finding Applicant: City of Atascadero, City Hall Annex, 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Project Title: Atascadero City Hall Repair and Rehabilitation Project Project Atascadero City Hall, 6500 Palma Avenue, Atascadero, CA 93422 Location: APN — 029-345-001 Project The project consists of a series of actions for the repair, maintenance, and rehabilitation of Description: Atascadero's City Hall. The project would occur in three phases. Funding for each phase of the project is derived from separate sources. Funding for the first phase of the project would come from a State grant. The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall within seven major categories of work, as follows: • Exterior cladding; • Roofing, waterproofing, and skylights; Interior partitions, doors, and glazing; Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation, and air conditioning repairs; and, • Electrical lighting, ower, and communication repairs. FINDINGS OF EXEMPTION: 1. An Initial Study has been prepared by the Lead Agency to evaluate the project's effects on wildlife resources, if any. 2. The Lead Agency hereby finds that there is no evidence before the City that the project will have any potential for adverse effect on the environment. 3. The project ❑will ® will not result in any changes to the following resources: (a) Riparian land, rivers, streams, watercourses and wetlands; (b) Native and non-native plant life and the soil required to sustain habitat for fish and wildlife; (c) Rare and unique plant life and ecological communities dependant on plant life; (d) Listed threatened and endangered plants and animals and the habitat in which they are believed to reside: (e) All species listed as protected or identified for special management in the Fish and Game Code, the Public Resources Code, the Water Code or regulations adopted thereunder; (f) All marine and terrestrial species subject to the jurisdiction. of the Department of Fish and Game and the ecological communities in which they reside; and (g) All air and water resources, the degradation of which will individually or cumulatively result in a loss of biological diversity among the plants and animals residing in that air and water. 'If the project will result in changes to any of these resources, the City has, on the basis of substantial evidence, "rebutted" the presumption of adverse effect to these resources. A statement in support of this rebuttal is attached. CERTIFICATION: I hereby certify that the Lead Agency has made the above finding(s) of fact and based upon the Initial Study and the hearing record the project will not individually or cumulatively have an adverse effect on wildlife resources, as defined in Section 711.2 of the Fish and Game Code. 4 t"" December 14,006 2 Steve McHarris, Deputy Community Development Director Date Filo 0602-2791 Mauad= 01Y Hao 1SMND Prim Dae: 12/14061:26 PM 6905 EL CAMINO REAL, SUITE 6 • ATASCADERO, CALIFORNIA 93422 • (805) 461-5000 • FAX 461-7612 �. CITY OF ATASCADERO NOTICE OF DETERMINATION 6905 EI Camino Real, Suite 6 Atascadero, CA 93422 (805) 461-5000 To: ® County Clerk, County of San Luis Obispo From: Steve McHarris, City of Atascadero Subject: Filing of Notice of Determination in Compliance with Section 21152 of the Public Resources Code STATE CLEARINGHOUSE #: Applicant: City of Atascadero, City Hall Annex, 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Project Title: Atascadero City Hall Repair and Rehabilitation Project Project Atascadero City Hall, 6500 Palma Avenue, Atascadero, CA 93422 Location: APN — 029-345-001 Project The project consists of a series of actions for the repair, maintenance, and rehabilitation of Description: Atascadero's City Hall. The project would occur in three phases. Funding for each phase of the project is derived from separate sources. Funding for the first phase of the project would come from a State grant. The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall within seven major categories of work, as follows: • Exterior cladding; • Roofing, waterproofing, and skylights; • Interior partitions, doors, and glazing; • Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation, and air conditioning repairs; and, • Electrical lighting,ower, and communication repairs. This is to certify that the City of Atascadero, the ® lead/a ❑ responsible agency approved the above-described project on 1. The project ❑ will ® will not have a significant effect on the environment. 2. ❑ An Environmental Impact Report was prepared and certified for this project pursuant to the provisions of CEQA and reflects the independent judgment of the Lead Agency. ❑ A Negative Declaration was prepared for this project pursuant to the provisions of CEQA and reflects the independent judgment of the Lead Agency. ® A Mitigated Negative Declaration was prepared for this project pursuant to the provisions of CEQA and reflects the independent judgment of the Lead Agency. 3. Mitigation measures ® were ❑ were not made a condition of the approval of the project. 4. A Statement of Overriding Considerations ❑ was ® was not adopted for this project. 5. Findings ® were ❑ were not made pursuant to the provisions of CEQA. 6. The location and custodian of the documents which comprise the record of proceedings for the Final EIR (with comments and responses) or Mitigated Negative Declaration are specified as follows: Custodian: Steve McHarris, Deputy Community Development Director Location: Community Development Department, 6905 El Camino Real, Suite 6, Atascadero, CA 93422 December 14, 2006 Steve McHarris, Deputy Community Development Director Date Fdc: 0602-7391 AU—dao City Hall ISMND Pro. Dnc 12114/061:26 PM 6905 EL CAMINO REAL, SUITE 6 • ATASCADERO, CALIFORNIA 93422 • (805) 461-5000 FAX 461-7612 CITY OF ATASCADERO ' . mPROPOSED MITIGATED NEGATIVE DECLARATION #2003-0016 6905 EI Camino Real, Suite 6 Atascadero, CA 93422 (805) 461-5000 Applicant: City of Atascadero, City Hall Annex, 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Project Title: Atascadero City Hall Repair and Rehabilitation Project . Project Atascadero City Hall, 6500 Palma Avenue, Atascadero, CA 93422 Location: APN — 029-345-001 Project The project consists of a series of actions for the repair, maintenance, and rehabilitation of Description: Atascadero's City Hall. The project would occur in three phases. Funding for each phase of the project is derived from separate sources. Funding for the first phase of the project would come from a State grant. The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall within seven major categories of work, as follows: • Exterior cladding; • Roofing, waterproofing, and skylights; • Interior partitions, doors, and glazing; • Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation, and air conditioning repairs; and, • Electrical lighting, power, and communication repairs. Findings: 1. The project does not have the potential to degrade the environment. 2. The project will not achieve short-term to the disadvantage of long-term environmental goals. 3. The project does not have impacts which are individually limited but cumulatively considerable. 4. The project will not cause substantial adverse effects on human beings either directly or indirectly. Determination: Based on the above findings, and the information contained in the Initial study 2006-0038 (made a part hereof by reference and on file in the Community Development Department), it has been determined that the above project will not have an adverse impact on the environment when the following proposed mitigation measures are incorporated into the project (see attachment). Prepared By: Date Posted: Public Review Ends: Attachments: Steve McHarris, Deputy Community Development Director December 15, 2006 January 17, 2007 Initial Study/Mitigated Negative Declaration 2006-0038 F,1. 0602-2391 AU..... Ciry Hall ISMND Prim Daae: 11/14/06126 PM 6905 EL CAMINO REAL, SUITE 6 • ATASCADERO, CALIFORNIA 93422 • (805) 461-5000 • FAX 461-7612 ENVIRONMENTAL CHECKLIST FORM Environmental Review 2003-0016 CITY OF ATASCADERO INITIAL STUDY Applicant: City of Atascadero, City Hall Annex, 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Project Title: Atascadero City Hall Repair and Rehabilitation Project Project Atascadero City Hall, 6500 Palma Avenue, Atascadero, CA 93422 Location: APN — 029-345-001 Project The project consists of a series of actions for the repair, maintenance, and rehabilitation of Description: Atascadero's City Hall. The project would occur in three phases. Funding for each phase of Zoning: the project is derived from separate sources. Funding for the first phase of the project would Surrounding Land Uses and come from a State grant. Setting: The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall South: Recreation (REC); Sunken Gardens within seven major categories of work, as follows: • Exterior cladding; • Roofing, waterproofing, and skylights; San Luis Obispo Air Pollution Control District San Luis Obispo County Environmental Health Department • Interior partitions, doors, and glazing; • Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation, and air conditioning repairs; and, • Electrical lighting, power, and communication repairs. Lead Agency Name and Address: City of Atascadero 6905 EI Camino Real, Suite 6, Atascadero, CA 93422 Contact Person and Phone Number: Steve McHarris, Deputy Community Development Director City Of Atascadero 6905 EI Camino Real, Suite 6 Atascadero, CA 93422 (805) 461-5000, ext. 3482 General Plan Designation: D — Downtown - Zoning: DC — Downtown Commercial Surrounding Land Uses and North: Downtown (Commercial); Atascadero Junior High School Setting: South: Recreation (REC); Sunken Gardens West: Downtown (Commercial) East: Downtown (Commercial) Other public agencies whose approval is required (e.g., permits, financing approval, or San Luis Obispo Air Pollution Control District San Luis Obispo County Environmental Health Department participation agreement) CITY OF ATASCADERO INITIAL STUDY TABLE OF CONTENTS Section Page 1.0 INTRODUCTION.............................................................................................................1-1 1.1 PURPOSE OF IS/MND......................... :.............................................................. 1-1 1.2 IS/MND FORMAT AND CONTENTS.................................................................. 1-1 1.3 CEQA IS/MND REQUIREMENTS....................................................................... 1-2 1.4 LEAD AGENCY NAME AND ADDRESS............................................................. 1-2 1.5 CONTACT PERSON AND TELEPHONE NUMBER .......................................... 1-2 1.6 PROJECT SPONSOR'S NAME AND ADDRESS ............................................... 1-2 1.7 PROPERTY OWNERS........................................................................................ 1-2 1.8 RESPONSIBLE AGENCIES................................................................................ 1-2 2.0 PROJECT DESCRIPTION.............................................................................................. 2-1 2.1 INTRODUCTION AND BACKGROUND............................................................. 2-1 2.2 PROJECT LOCATION..................................................................••..................... 2-3 2.3 SITE FEATURES...................................................................................•-•----....... 2-3 2.4 NECESSARY PROJECT IMPROVEMENTS...................................................... 2-3 2.5 PROJECT OBJECTIVES AND DESCRIPTION .................................................. 2-4 2.6 PROJECT FUNDING.................................................•----............•--•.......-•--........ 2-12 3.0 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED ......................................... 3-1 3.1 AESTHETICS:.................. -... ......... .................................... ... 3-4 3.2 AGRICULTURAL RESOURCES.....-•................................................................. 3-5 3.3 AIR QUALITY....................................................................................................... 3-6 3.4 BIOLOGICAL RESOURCES.....................•-------..........---................................... 3-14 3.5 CULTURAL RESOURCES.............. ............3-16 3.6 GEOLOGY AND SOILS..................................................•--................................ 3-56 3.7 HAZARDS AND HAZARDOUS MATERIALS .................................................... 3-59 3.8 HYDROLOGY AND WATER QUALITY............................................................ 3-61 3.9 LAND USE AND PLANNING............................................................................. 3-64 3.10 MINERAL RESOURCES................................................................................... 3-65 3.11 NOISE................................................................................................................ 3-65 3.12 POPULATION AND HOUSING......................................................................... 3-69 3.13 PUBLIC SERVICES........................................................................................... 3-70 3.14 RECREATION................................................................................................... 3-71 3.15 TRANSPORTATION/TRAFFIC.........................................................................3-73 3.16 UTILITIES/SERVICE SYSTEMS....................................................................... 3-76 3.17 MANDATORY FINDINGS OF SIGNIFICANCE ................................................. 3-78 1-i C1 TY OF ATASCADERO INITIAL STUDY LIST OF TABLES Table Title Page 3.3-1 Ambient Air Quality Standards .................................................... ............................... 3-9 3.3-2 Summary of Air Quality Standard Exceedances........................................................ 3-10 3.5-1 Repair and Rehabilitation Impact Evaluation............................................................. 3-18 3.11-1 Definitions of Acoustical Terms.................................................................................. 3-66 3.15-1 Roadway Classifications............................................................................................. 3-74 LIST OF FIGURES Figure Title Page 2-1 Site Vicinity Map............................................................................................................... 2-5 2-2 Site Location Map............................................................................................................ 2-7 2-3 Site Plan.......................................................................................................:................... 2-9 3.5-1 Existing Basement Level Floor Plan.............................................................................. 3-33 3.5-2 Existing First Floor Plan................................................................................................. 3-35 3.5-3 Existing Second Floor Plan............................................................................................ 3-37 3.5-4 Existing Third Floor Plan................................................................................................ 3-39 3.5-5 Existing Fourth Floor Plan............................................................................................. 3-41 3.5-6 Existing Upper Rotunda Mezzanine Plan...................................................................... 3-43 3.5-7 Existing Roof Plan.......................................................................................................... 3-45 3.5-8 Existing Section A.......................................................................................................... 3-47 3.5-9 Existing Section B.......................................................................................................... 3-49 APPENDICES A. MITIGATION MONITORING AND REPORTING PROGRAM B. HISTORICAL RESOURCES REPORT C. SOILS ENGINEERING REPORT CITY OF ATASCADERO INITIAL STUDY CHAPTER 1.0 INTRODUCTION 1.1 PURPOSE OF THE INITIAL STUDY/MITIGATED NEGATIVE DECLARATION The City of Atascadero (City) Community Development Department, serving as the Lead Agency under the California Environmental Quality Act (CEQA), has prepared this Initial Study/Mitigated Negative Declaration (IS/MND) to assess the impacts that may result from the development of the proposed project. The proposed project involves a series of actions to repair and rehabilitate the Atascadero City Hall (City Hall), built in 1918, which was damaged by the 6.5 (Richter Scale) San Simeon Earthquake, which occurred on December 22, 2003. The City Hall is on the National Register of Historic Places (#77000336) and is a California Historical Landmark (#958). It is a 58,834 square -foot building constructed of unreinforced masonry and concrete frame with a masonry veneer. The 'damage caused to the historic building forced its closure and the relocation of City staff to other buildings. This IS/MND is intended to inform the public, decision makers and other responsible or interested agencies and organizations of the potential environmental effects of the proposed project. The environmental review process enables public agencies to evaluate a project in terms of its environmental consequences and to consider and implement methods of eliminating or reducing any potentially adverse impacts. This document is being prepared to review and evaluate the significance of the project's impacts on historical resources and covers only the first phase of the project. 1.2 IS/MND FORMAT AND CONTENTS The IS/MND comprises the substantive portion of the environmental documentation for the project prepared to comply with CEQA requirements. This. IS/MND has been prepared in conformance with the CEQA Guidelines for Implementation of the California Environmental Quality Act, California Code of Regulations, Title 14 (hereafter "CEQA Guidelines"). The IS/MND examines the following topic areas: • Aesthetics • Agricultural Resources • Air Quality • Biological Resources • Cultural Resources • Geology and Soils • Hazards and Hazardous Materials • Hydrology/Water Quality 1-1 • Land Use/Planning • Mineral Resources • Noise • Population and Housing • Public Services • Recreation • Transportation/Traffic • Utilities/Services Systems CITY OF ATASCADERO INITIAL STUDY 1.3 CEQA IS/MND REQUIREMENTS An IS/MND must be prepared in conformance with the CEQA of 1970, as amended. Public Resources Code Section 21064.5 and CEQA Guidelines Section 15070 state that an IS/MND may be prepared if the Initial Study identifies a potentially significant effect for which the project proponent has made, or agrees to make, project revisions that clearly mitigate the effects. Additionally, an IS/MND may not be used if any substantial evidence indicates that the revised project with mitigation may still have a significant effect on the environment. 1.4 LEAD AGENCY NAME AND ADDRESS CEQA applies to discretionary government actions that are defined as a project and have the potential to result in either a direct or indirect physical change in the environment. An activity is considered a project if it requires issuance of a lease, permit, license, certificate, or other entitlement by a public agency. The CEQA Lead Agency is the California government.agency that has the principal responsibility of approving a project and preparing the appropriate CEQA documentation. CEQA applies to all California government agencies at all levels, including local agencies, regional agencies, and state agencies, boards, commissions, and special districts. The City is designated as the CEQA lead agency for approval of this project by virtue of its discretionary authority as a municipality. 1.5 CONTACT PERSON AND TELEPHONE NUMBER Mr. Steve McHarris, Deputy Director City of Atascadero Community Development Department 6905 EI Camino Real, Suite 6 Atascadero, CA 93422 Telephone (805) 461-5000, ext. 3482 1.6 PROJECT SPONSOR'S NAME AND ADDRESS See above 1.7 PROPERTY OWNERS See above 1.8 RESPONSIBLE AGENCIES A responsible agency is an agency other than the lead agency that has a legal responsibility for also carrying out or approving a project. The responsible agency must actively participate in the lead agency's CEQA process by reviewing the document and using it for the approval of the project. The responsible agency may also use this document to achieve CEQA compliance when issuing permits or approvals required authorizing the project. Responsible agencies pertaining to this project include: • San Luis Obispo Air Pollution Control District. California Air Resource Board has enacted an Asbestos Airborne Toxic Control Measure for Construction, Grading, Quarrying and Surface Mining Operations. The San Luis Air Pollution Control District 1-2 CITY OF ATASCADERO INITIAL STUDY (APCD) would require submittal of an evaluation prior to construction which includes a determination as to whether building materials at the project site may contain asbestos. If asbestos is present, then the APCD may require preparation of an Asbestos Health and Safety Program and dust mitigation measures under guidance of the National Emission Standards for Hazardous Air Pollutants (NESHAP). • County of San Luis Obispo Environmental Health Department. The San Luis Obispo Environmental Health Department (SLOEHD) would be responsible for dealing with lead issues in the event lead is found. Due to the age of the building, it is very likely that lead is present. Therefore, SLOEHD would act as an implementing authority for preparation of a Lead Work Plan. 1-3 CITY OF ATASCADERO INITIAL STUDY THIS PAGE LEFT INTENTIONALLY BLANK 1-4 1'ccaavo .n . CITY OF ATASCADERO INITIAL STUDY CHAPTER 2.0 PROJECT DESCRIPTION 2.1 INTRODUCTION AND BACKGROUND The City has proposed to undertake actions to repair and rehabilitate the City Hall, which was damaged by the 6.5 San Simeon Earthquake of December 22, 2003. The project, known as the City Hall Repair and Rehabilitation Project, would include seven categories of work related to repair, rehabilitation and maintenance of the building as specified by a team of architectural and engineering consultants retained by the City. With implementation of the proposed project, the City aims to ensure that the project conforms to provisions of CEQA Guidelines pertaining to preservation and restoration of registered historic buildings. This document is being prepared in order to review and evaluate the significance of the project's impacts on historical resources and other areas of potential environmental significance. The IS/MND covers the first of three separate, distinct phases. A detailed explanation of the characteristics of the first phase is provided in Section 2.5. 2.1.1 Building History The City Hall was originally designed and constructed to be the centerpiece of the Atascadero Colony, a utopian planned community by Edward Gardner Lewis. With the desire to have an administration building to attract attention to the community, Lewis commissioned Bliss and Faville, a prominent San Francisco architectural firm to design the building. After completion of -the design process, construction began in 1914 and was completed in 1918 by the F.O. Engstrom Company of Los Angeles utilizing local resources, including bricks made from local clay. Designed with a Greek cross plan, the building houses two separate and distinct rotunda spaces on the.first and fourth floors in the center of the building, with offices ringing the perimeter. The 40 -foot tall rotunda space on the first floor was designed to be a museum to showcase agricultural and mineral products. It is far more ornate than the fourth floor rotunda due to the decorative plaster, coffered dome, clerestory windows and elaborate chandelier. The 44 -foot tall rotunda on the fourth floor was originally planned to be the community library and, up until the earthquake, was used as city council chambers. This rotunda is more subdued than the first floor space due to. the original space plan for the building. Ornate plaster column capitals are the most decorative elements and the original skylight at the top of the dome has long been eliminated on the exterior of the building and re -roofed with a metal cap. The remainder of the. building is filled with offices. The building functioned as the headquarters of the Colony Holding Corporation until the Colony's bankruptcy in the mid 1920's. After that, the building housed many -functions including real estate offices, a bank, and a number of different schools. The County of San Luis Obispo acquired the building in 1950 as a Veteran's Memorial and leased out portions to a local school. In 1952 the County moved its offices into the building and when the City incorporated in 1979, 2-1 CITY OF ATASCADERO INITIAL STUDY the building was returned to the City to function as an administration building. The building was listed on the National Register of Historic Places (#77000336) in 1977 and was made a California Registered Historical Landmark (#958) in 1984. 2.1.2 Structural Damage As a result of the San Simeon Earthquake, extensive damage occurred to the City Hall, including approximately seven inches of differential foundation settlement and slab -on - grad buckling. The reinforced concrete floors and stairs also sustained spalling damage (i.e., cracking and chipping). The unreinforced masonry walls were damaged by major cracking, spalling, permanent distortion, and localized collapse. Evaluation of the structural earthquake damage was performed using Federal Emergency Management Agency (FEMA) guidelines, finite element computer techniques and ground motion data from the 2003 San Simeon earthquake. Based on the structural evaluation data, the structural earthquake safety of the City Hall building has been significantly reduced. Extensive structural repairs are required to repair and rehabilitate the pre -earthquake safety levels of the City Hall building. 2.1.3 Architectural and Materials Damage Architectural and materials damage also occurred. Flooring, including concrete and vinyl, was damaged. Interior plaster damage and cracking occurred to interior walls. Ceiling damage included cracking and plaster delamination, as well as water damage as a result of rain entering through punctures in the ceiling. Doors. sustained damage via jamming 2-2 CITY OF ATASCADERO INITIAL STUDY caused by differential settlement. Damage to windows includes shattered glass and misaligned frames and sashes. Other materials damage includes cracked plaster, at entry porticos. Roofing on the City Hall was also significantly damaged, creating gouges that were caused by falling masonry debris. Skylights werecracked or shattered and will also require replacement. These damaged elements and a large number of other miscellaneous repairs are required. 2.2 PROJECT LOCATION The City Hall project site is located at 6500 Palma Avenue in downtown Atascadero. The parcel consists of approximately one acre bordered by Sunken Gardens to the south, Atascadero Junior High school to the north and downtown commercial uses to the west and east. See Figures 2-1 and 2-2 for site vicinity and site location maps. Figure 2.3 provides a site plan view of the project site. 2.3 SITE FEATURES The site is currently developed with the City Hall, which was built in 1918 and damaged by the 6.5 (Richter scale) San Simeon Earthquake of December 22, 2003. The City Hall is on the National Register of Historic Places (#77000336) and is a California Historical Landmark (#958). It is a 58,834 square -foot building constructed of unreinforced masonry and concrete frame with a masonry veneer. The damage caused to the historic building forced its closure and the relocation of City staff to other buildings. The existing topography is flat and contains mature trees comprised of non-native evergreens. The site is also fully landscaped with lawns and shrubbery. No native vegetation or sensitive habitats exist on the site. 2.4 NECESSARY PROJECT IMPROVEMENTS The proposed project consists of a series of actions for the repair and rehabilitation of the City Hall. It is the first phase of a three-phase project, which.will be funded by separate and different sources for each phase. This IS/MND covers the first phase of the project, which would obtain funding from a State grant (see Section 2.6). Specific work items associated with the first phase are described in more detail in Section 2.5. The first phase covers work only associated with the repair, maintenance and rehabilitation of the historical and cultural aspects (i.e. architectural veneers, floor and roof structures) of the damaged City Hall. Subsequent phases would cover other building elements, such as fire protection systems and Building Code requirements that are not associated with the historical restoration work as funded by the State grant. This includes a phase to be funded by FEMA to repair structural earthquake damage to achieve seismic safety standards. Structural repair, as outlined in the City of Atascadero City Hall Damage Assessment & Rehabilitation Plan (Pfeiffer Partners, 2005), is designed to repair and rehabilitate the pre - earthquake performance levels of the building and includes the following: 2-3 CITY OF ATASCADERO INITIAL STUDY • Epoxy injection of earthquake cracks in damaged reinforced concrete floors and stairs; and, • Repair of extensive earthquake damage to unreinforced masonry walls using a variety of repair techniques as appropriate based on the damage conditions, including grout injection, reinforced concrete overlays, carbon fiber overlays, steel replacement bracing, wall anchorage, and localized removal and reconstruction. In addition to the structural repairs, additional seismic strengthening measures are recommended to mitigate future earthquake damage including: • Additional reinforced concrete overlays on unreinforced masonry walls; •. Connection strengthening of the timber dome framing and ring beam; and, • Anchorage of brick veneer. 2.5 . PROJECT OBJECTIVES AND DESCRIPTION (Phase 1) The purpose of the project is to allow repair and rehabilitation of the usefulness of the City Hall and to address and satisfy the statutory provisions related to structures of historical and archaeological significance (Section 15064.5, Article 5, CEQA Guidelines). There are 55 specific items that constitute the first phase of the project that fall within seven major categories: • Exterior cladding; • Roofing', waterproofing, and skylights; • Interior partitions, doors, and glazing; • Floor and roof structure repairs; • Plumbing system repairs; • Heating, ventilation; and air conditioning repairs; and, • Electrical lighting, power, and communication repairs. Work items within the first three categories noted are classified as restoration activity, whereas work items within the last four categories are classified as deferred maintenance activity. With respect to this project, restoration activity consists of those actions or treatments intended to restore character -defining elements of the building to their original 1918 condition and appearance, whereas deferred maintenance activity consists of repair work intended to extend and enhance the life of City Hall (i.e., improve the infrastructure of the building to a condition superior to that which existed prior to the San Simeon earthquake.. 2-4 November 2006 Proiect No.0602-2391 E•. �� ' .s •�'.:'.':. r'' ••. FYI 'I ,. '�'".�p.�'�. •a�lY��-' "`�"% RKEY MAP 3: �� ti I 4ti' x ca+'*moi �7EF 4 , \ •gam '' ''¢r-}'� ..� • 1 `• �~I G•V, �t 1 I �t _ .•eb, � — — 777 — � a , ri' C t •-'Ste �� I y� a. - '� � 5:_. 4 ~• _'}r'_ 9,fn M1eelr i �' L1i ti ,� ..� PROJECT J j.V�- III��""-•••''` 'fl VICINITY in I-- c NW Tim— a9�1 511 AJ •� ;a 9^. .( y � �1�.r :i tr •�� -- I � I ,Ir, v /' ,T� rr :y„�I `tel I"� i�h . �•,� ,�.-- i 6` _ =FAr, 13ARDF-A=IAL- I k IK � �S 7 r.• I N� !.'i arkss. CN 11 TV.A e'ik �''r.�, �,c�''•}�y i�`":•' r,J- r > "� i"• c'tiolae5'nD a �-.. ;: •4rec� I; s"', � ' - - '•.-r -:•amu: %' `'�., ,"a-ln :��._, � ..�; � �� aclr!lel:sn I ^, Ltil, �' _ r_ —,'_,—.. �s-�- f`•-..;.-'--•; � sl.d+ao. , �R �,� j;'s '-h+�_ . 75ar arryrsin(( - ,I ti„_�'"�• 1 .� ` -.G. l I��r• '�� tvo9t_ �,: I_ V PROJECT — , ---- .Qa.�rfxe SITE �, � ,�,ni6r'i>f� .,'..eyM'�--��,'^� ,' fF•--�� J � �,� u � "', rx �1''� Y ..� �• 5.,. s .w i r5,.r•:.r' .,y� .. y, 5KciIon .4 1, •& �,, `t I`( ', PM.-l� Er.IM4.. ` } 1�N yrx�s.e4{r+Ur�,.4 ,,, c,5�Vr �/,• x-_.�IIIII �(1. s �+�rr yrI I-`�� _�..,�a Jr� �'�'� �'n7'�''�.� 1 cI r.�. �ai • i. R..� mo,; 0uti { Qh-.1-v`r_Z_I N 7THI � r . Aft 5 Tn5 1 _' ? •�, i _ fib:A,�F» 'LS't I L\ ,, 'a nr: }.. 5•r :.,,�q'1t-.n t"---_ :: ►Itr i' (-�"`�>� I T9 %: u1•ATSIAr PLIC `J _ l ti; C� �~ re kL tlimEh)svn1' +0 .5 •'s '. � -Li r r K” e:'�nL .Y f f�.T •— (G- 1 rpHllx PrpG Pd�t .^ 1 iJ.tl+ �f. �' • :ASS• } �J r � :re;m .11.2j - T5, ��f�': ', C. NORTH 1 �!SFK�sc�rn 'ar APPROXIMATE SCALE o,. +5 Z ra-c icaa,t" r1— ff;-tiK 1 INCH = 8.4 MILES ` i t;,r_., I 'o�`r rSJur Has:.gP.�• r r4 � y,;,e %i i ,_J r Source: TOPO! c 2004 National Geographic Holdings (www.topo.com) aadre SITE VICINITY MAP ssociates, enc. ENGINEERS, GEOLOGISTS & ENVIRONMENTAL SCIENTISTS FIGURE 2-1Atascadero City Hall Repair Project IS/MND November 2006 Project No. 0602-2391 [� \.. ��`\;• _- .rN .��,�� `"9fr✓�� y�`1�`.i'ir\�-/�! i h .s `v� -t�Y1 til , UIU� Ji 1/ p!• l,(t uS '` 1�..,; f/ CA `fr. �{ ri� 1.� % Ijgf�' r� ------------------ �1if--� u_`,•- •-�� fr ��^l?.. �jd�=-aarK.l��. -� ..� ;`�': '=S, d _ 1.�1 ':L/.( F' �t`�-' '� i' S,L!!� `, (% . `l' FF' •,�``, it �'��'�� /... ,,,.��.�` �='>'-; • � 1 >, �� Hyl! . '. �f�� fir. ,. ``..1`' � tti�`.sr._ ,,;, ti c r� �� ^�`.�y �, � ;;> ti\� t. lv�i'�2�ae1{� - r �?4, • Ir � �� --�•, tom..-��.-1 �1 1 �`Y•ti ��l�\�. S �•'�i i�,s ,�) ;�ti•C � � -�6`• ♦\� �' /� , ER0 � 1 J U fk •_ �k ..� c't - . S c r� 7 l�F J4 �S.h . 'I yam'' : , l r ft'Z _ r 4`j'�l�i,� •-�•r��,�� ,�,�` �f 1 I �,� �'� ti � r..��-, ika 1 :. y'� 4 s, � rr ot. y `,• _ ^ u PROJECT SITE 1. -� � �� -�al ..y l��,,� �� `--.` �'t?,f,�`•. � �. L. ;s13 s. ,i.r",J"'� jlf0� r k_ �u' i- �t .a5a' ✓ h y ': S� ► . - ✓/ d 71W i7 t �k � � r rll,4 V.`a1,b: rg ��4ts6�Q U rA �k ,,� fir7 ,I �l' _ i A, Ja ii f�. ry. iT — it t:�� J�. - �: ��•^tom.,. -� 7+''v` NORTH APPROXIMATE SCALE asa> l r`) 1 INCH = 0.6 MILES -- Source: TOPO! c 2004 National Geographic Holdings (www.topo.com) dre ass4aiatea, inc. ENGINEERS, GEOLOGISTS 8 ® EMRONMEKAL SCIENTISTS Atascadero City Hall Repair Project IS/MND SITE LOCATION MAP FIGURE 2-2 rn co N N CD 0 N N O -0Z E U a) a) U W oa a C? Q N W W H � LL aUi U O U a CL m N C' E Q7 N C U) O r = -r- ca �•Y� LU o 0 � r O • � � uvi U ® < a LU = F. J Q U � O cn TIt+I^I LS'd� Z z • o 1 1 li ; ii I .n n 1 � OI 1 I U i rCn 1 U � 5 i n I u 1 1 o e `1'I�NI .LS3A1 } F— a' Q W O n Z O� �O am a C? Q N W W H � LL aUi U O U a CL m N C' E Q7 N C U) O r = -r- ca �•Y� LU o 0 � r O • � � uvi U ® < a Exterior Cladding CITY OF ATASCADERO INITIAL STUDY • Exterior Finishes Repairs: pin loose decorative terra cotta, repair decorative terra cotta glaze and bisque spalls, rebuild displaced masonry, patch spalled brick, remove and replace damaged parge coating, inject epoxy into cracked brick and terra cotta, repoint open mortar joints in brick and terra cotta, replaced 12 missing stone pieces, prep and paint exposed steel lintels, remove mortar droppings on surface of terra cotta from previous repair work, and repair cast stone column bases; • Exterior Doors & Frames: replace non -historic aluminum entrance doors with new Hope's metal doors and transom to match historic pattern, reconfigure existing exterior masonry to match opposite corner due to door replacement, and prepare and paint existing door lintels; • Exterior Soffits: prepare and paint peeling roof eaves, and prepare and paint existing plaster ceilings at entries; • Exterior Balustrades. Parapets, and Roof Screens: install epoxy pin anchors in cracked terra cotta balustrades, repair terra cotta glaze spalls, replace terra cotta blocks that have significant spalls, inject epoxy into terra cotta and brick cracks, repair the existing steel balustrade bracing, install new parge coating at top surface of brick parapet, repoint terra cotta joints at balustrade, clean organic growth on balustrade, and remove CMU infill in balustrade and replace with new terra cotta balusters to match historic pattern; and, • Miscellaneous Exterior Work: prep and paint all cast stone, clean off all efflorescence, clean off all water stains, and clean off all organic growth. Roofing, Waterproofing, & Skylights • Repair and rehabilitation would include: install below grade membrane waterproofing Jo foundations walls, clean fascia flashing at roofing, fasten uncompleted roof drains, add bird stop, remove and replace all painted glass in upper rotunda ceiling with new translucent tempered glass to match historic pattern, restore skylights above two main staircases, and miscellaneous caulking and sealing. Interior Partitions, Doors & Glazing • Partitions: recreate overlooks into first floor rotunda, construct light boxes at previous clerestory locations in lower rotunda, and construct light boxes at previous clerestory in upper rotunda; and, • Balustrades and Rails: reopen overlooks into first floor rotunda including demo, rebuild railings, rebuild low wall and install glass, and remove existing railing and replace with new to match historic pattern. 2-11 f CITY OF ATASCADERO INITIAL STUDY Floor & Roof Structure Repairs • Repair spalled and cracked concrete slabs and beams at the suspended floors; • Remove and replace roof framing; • Replace plywood sheathing at roof; and, • Miscellaneous metal and blocking repairs. Plumbing System Repairs • Sanitary waste, vent, and service pipework repairs; • Kitchen system repairs including equipment connection, grease waste fittings and grease interceptor; and • Upgrade natural gas service including shut off valves, pipework, and fittings. Heating, Ventilation, & Air Conditioning (HVAC) Repairs • Replace HVAC air distribution systems, zoning & controls. Electrical Lighting, Power & Communication Repairs • Upgrade, main power and distribution breakers to (e) switchboard; • Upgrade machine and equipment power connections, switches, conduit, and cable; • Upgrade user convenience power receptacles, including conduit and cable, spot upgrades; • Install new lighting fixtures at upper and lower rotunda light boxes; • Upgrade lighting control panels; and, • Upgrade telephone/data outlets, including conduit and cable, spot upgrades. 2.6 PROJECT FUNDING In September of 2002, Governor Davis signed the California Cultural and Historical Endowment Act, which established the California Cultural and Historical Endowment (Endowment) in the California State Library (AB 716). The Act requires the Endowment to use Proposition 40 fund to make grants and loans to public agencies and nonprofit organizations for California's cultural and historic resources. Proposition 40 - the California Clean Water, Clean Air, Safe Neighborhood Parks, and Coastal Protection. Act), approved in 2002,. included $267 million for historic and cultural resource preservation. Due to its historical significance, the City Hall 2-12 CITY OF ATASCADERO INITIAL STUDY demonstrates "culturally significant aspects of life during various periods of California history, including architecture..." The establishment of the Endowment is intended to raise the profile and scope of California's historic and cultural preservation program. In 2003, the state budget authorized the Endowment to spend $128 million of Proposition 40's funds to carry out its programs. The City Hall would use Proposition 40 funds to support the repair and rehabilitation of the City Hall. 2-13 THIS PAGE LEFT INTENTIONALLY BLANK 2-14 CITY OF ATASCADERO INITIAL STUDY CITY OF ATASCADERO INITIAL STUDY CHAPTER 3.0 ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED The environmental factors checked below would be potentially affected by this project, involving at least one impact that is a "Potentially Significant Impact' as indicated by the checklist on the following pages. ❑ Aesthetics ❑ Agriculture Resources ® Air Quality ❑ Biological Resources ® Cultural Resources ® Geology /Soils ® Hazards & Hazardous ❑ Hydrology / Water ❑ Land Use / Planning Materials Quality ❑ Mineral Resources ® Noise ❑ Population / Housing ❑ Public Services ❑ Recreation ® Transportation/Traffic ❑ Utilities / Service ® Mandatory Findings of Significance Systems On the basis of this initial evaluation: ❑ 1 find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE DECLARATION will be prepared. ® 1 find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this case because the mitigation measures described on an attached sheet have been added to the project. A MITIGATED NEGATIVE DECLARATION will be prepared. ❑ I find that the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required. ❑ I find that the proposed project MAY have a "potentially significant effect' or "potentially significant unless mitigated" impact on the environment, but at least one effect 1) has been adequately analyzed in an earlier document pursuant to applicable legal standards, and 2) has been addressed by mitigation measures based on the earlier analysis as described on attached sheets. An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain to be addressed. 3-1 CITY OFATASCADERO INITIAL STUDY ❑ I find that although the proposed project could have a significant effect on the environment, there WILL NOT be a significant effect in this case because all potentially significant effects (a) have been analyzed adequately in an earlier EIR or NEGATIVE DECLARATION pursuant to applicable standards and (b) have been avoided or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION, including revisions or mitigation measures that are imposed upon the proposed project. Steve McHarris Deputy Community Development Director 3-2 CITY OF ATASCADERO INITIAL STUDY EVALUATION OF ENVIRONMENTAL IMPACTS: 1) A brief explanation is required for all answers except "No Impact' answers that are adequately supported by the information sources a Lead Agency cites following each question. A "No Impact' answer is adequately supported if the referenced information sources show that the impact simply does not apply to projects like the one involved (e.g. the project falls outside a fault rupture zone). A "No Impact' answer should be explained where it is based on project -specific factors as well as general standards (e.g. the project will not expose sensitive receptors to pollutants, based on a project -specific screening analysis). 2) All answers must take in account of the whole action involved, including off-site as well as on-site, cumulative as well as project -level, indirect as well as direct, and construction as well as operational impacts. 3) "Potentially Significant Impact' is appropriate if there is substantial evidence that an effect is significant. If there are one or more "Potentially Significant Impact' entries when the determination is made, an EIR is required. 4) "Potentially Significant Unless Mitigation Incorporated" applies where the incorporation of mitigation measures has reduced an effect from "Potentially Significant Impact' to a "Less than Significant Impact." The Lead Agency must describe the mitigation measures, and briefly explain how they reduce the effect to a less than significant level (mitigation measures from Section XVII, "Earlier Analyses," may be cross-referenced). 5) Earlier analyses may be used where, pursuant to the tiering, program EIR, or other CEQA process, an effect has been adequately analyzed in an earlier EIR or negative declaration. Section 15063(c)(3)(D). Earlier analyses are discussed in Section XVII at the end of the checklist. 6) Lead Agencies are encouraged to incorporate into the checklist references information sources for potential impacts (e.g. general plans, zoning ordinances). Reference to a previously prepared or outside document should, where appropriate, include a reference to the page or pages where the statement is substantiated. A source list should be attached. Other sources used or individuals contacted should be cited in the discussion. 3-3 CITY OF ATASCADERO INITIAL STUDY SOURCES: Site Visit. Setting The City is located near the southern end of the Salinas Valley adjacent to the Salinas River. The core of the City lies just west of the River along EI Camino Real, which supports the majority of the City's commerce and business activities. Further west, residential neighborhoods extend in ever -decreasing densities into the foothills of the coastal Santa Lucia Mountains. Seasonal streams that meander through the foothills and neighborhoods to the valley floor cut the slopes of the Santa Lucia's. The wooded foothills provide the visual backdrop and setting for the City. Oak trees are an important visual characteristic of the City, in forests, smaller groves, and as landmark individuals. The site is currently the location of quake -damaged City Hall, which was built in 1918, and is fully landscaped with lawn, shrubbery, and mature, non-native trees. The City Hall is located in downtown Atascadero in the commercial business district. Adjacent buildings include small commercial businesses to the west and east, and the Atascadero Junior High School to the north. Visual resources of note adjacent to the City Hall include Sunken Gardens and the large, mature Deodor Cedar (Cedrus deodora) trees located on the park and City Hall grounds. Scenic vistas are generally obscured by these large trees, and surrounding development. Answers to Checklist Questions Questions A -C: The site does not provide a substantial scenic vista or views of rock outcroppings; however, construction activities would temporarily alter the visual aesthetics of the City Hall as viewed from the immediate surroundings, such as Sunken Gardens. Existing vegetation is not proposed for removal, and there would not be substantial amounts of exposed soils during construction. However, minor amounts of construction equipment for repairs and hauling of 3-4 Less Than Potentially Significant Less Than No Initial Study 2006-0038 Significant Impact with Mitigation Significant Impact Impact p City Hall Repair and Rehabilitation Project Incorporation 3.1. AESTHETICS — Would the project: a) Have a substantial adverse effect on a scenic vista? 0 b) Substantially damage scenic resources, including, but not limited to, trees, rock outcroppings, and historic buildings within a state scenic highway? c) Substantially degrade the existing visual character or quality of the site and its surroundings? d) Create a new source of substantial light or glare that would adversely affect day or nighttime views in the area? SOURCES: Site Visit. Setting The City is located near the southern end of the Salinas Valley adjacent to the Salinas River. The core of the City lies just west of the River along EI Camino Real, which supports the majority of the City's commerce and business activities. Further west, residential neighborhoods extend in ever -decreasing densities into the foothills of the coastal Santa Lucia Mountains. Seasonal streams that meander through the foothills and neighborhoods to the valley floor cut the slopes of the Santa Lucia's. The wooded foothills provide the visual backdrop and setting for the City. Oak trees are an important visual characteristic of the City, in forests, smaller groves, and as landmark individuals. The site is currently the location of quake -damaged City Hall, which was built in 1918, and is fully landscaped with lawn, shrubbery, and mature, non-native trees. The City Hall is located in downtown Atascadero in the commercial business district. Adjacent buildings include small commercial businesses to the west and east, and the Atascadero Junior High School to the north. Visual resources of note adjacent to the City Hall include Sunken Gardens and the large, mature Deodor Cedar (Cedrus deodora) trees located on the park and City Hall grounds. Scenic vistas are generally obscured by these large trees, and surrounding development. Answers to Checklist Questions Questions A -C: The site does not provide a substantial scenic vista or views of rock outcroppings; however, construction activities would temporarily alter the visual aesthetics of the City Hall as viewed from the immediate surroundings, such as Sunken Gardens. Existing vegetation is not proposed for removal, and there would not be substantial amounts of exposed soils during construction. However, minor amounts of construction equipment for repairs and hauling of 3-4 CITY OF ATASCADERO INITIAL STUDY construction materials would be present near the City Hall during the course of construction. This would represent a short-term. visual change in the aesthetic character of the City Hall. These impacts would be temporary in nature. Ultimately, repair and rehabilitation of the City Hall would have a beneficial effect through restoration of its currently damaged exterior; therefore, impacts would be less than significant. Questions D: No new sources of light would be introduced to the project area as a result of the City Hall Repair and Rehabilitation Project. No nighttime construction is proposed; therefore, impacts would be less than significant. Finding The proposed project would result.in less than significant impacts to aesthetics and no mitigation measures are required. Less Than Potentially Significant Less Than No Significant with Significant Impact Initial Study 2006-0038 Impact Mitigation Impact City Hall Repair and Rehabilitation Project Incorporation 3.2. AGRICULTURAL RESOURCES: In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Dept. of Conservation as an optional model to use in assessing impacts on agriculture and farmland. Would the project: a) Convert Prime Farmland, Unique Farmland, or Farmland ❑ of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non- agricultural use? b) Conflict with existing zoning for agricultural use, or a ❑ Williamson Act contract? c) Involve other changes in the existing environment which, ❑ ❑ due to their location or nature, could result in conversion of Farmland, to non-agricultural use? SOURCES: Site Visit. Setting There are currently about 44 acres of zoned agricultural lands within the City. There are over 100 acres of prime farmland along the Salinas River, Farmland of Local Potential along Graves Creek, and a large amount of acreage that is classified as grazing land. 3-5 Answers to Checklist Questions Questions A -C: CITY OF ATASCADERO INITIAL STUDY As the project site has been fully developed, it is not considered prime farmland. Because the property is developed and is located in an urbanized setting, there would be no impacts to agricultural resources. Finding There would be no impact to agricultural resources. SOURCES: Air Pollution Control District (APCD) CEQA Air Quality Handbook, California Air Resources Board, West Front Villages IS/MND (City of Atascadero) Setting This section addresses the air emissions of the proposed project and the potential impacts to air quality. Impacts to air quality associated with the project were assessed based on a comparison to the significance thresholds developed by the San Luis Obispo County Air Pollution Control District (APCD). M Less Than Potentially Significant Less Than No Initial Study 2006-0038 Significant Impact with Mitigation Significant Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.3. AIR QUALITY -- The significance criteria established by the Air Quality Control District in its CEQA Guidelines may be relied upon to make the following determinations. Would the project: a) Conflict with or obstruct implementation of the applicable air quality plan? b) Violate any air quality standard or contribute substantially ® El El to an existing or projected air quality violation? c) Result in a cumulatively considerable net increase of any El El ® 0 criteria pollutant for which the project region is non - attainment under an applicable federal or state ambient air quality standard (including releasing emissions that exceed quantitative thresholds for ozone precursors)? d) Expose sensitive receptors to substantial pollutant concentrations? e) Create objectionable odors affecting a substantial number El ❑ ® a of people? SOURCES: Air Pollution Control District (APCD) CEQA Air Quality Handbook, California Air Resources Board, West Front Villages IS/MND (City of Atascadero) Setting This section addresses the air emissions of the proposed project and the potential impacts to air quality. Impacts to air quality associated with the project were assessed based on a comparison to the significance thresholds developed by the San Luis Obispo County Air Pollution Control District (APCD). M Climate and Meteorology CITY OF ATASCADERO INITIAL STUDY The project site is located in the City of Atascadero, within the upper Salinas River Valley. This area supports about 25 percent of the County's population, and has historically experienced the highest ozone and particulate levels in the County. Transport of ozone precursors (oxides of nitrogen and hydrocarbons) from coastal regions and the San Joaquin Valley may contribute to the high pollutant levels. Although the project area is located about 15 miles from the coast, the Pacific Ocean plays a key role in moderating temperatures and affecting weather patterns. Summers are warm, but an early morning marine layer may occur. Winters are usually cool and wet with the rainy season extending from late November to early April. The nearest climatic data station to the project site is in the City of Atascadero. The coldest month is December, with an average minimum temperature of 31 degrees Fahrenheit. The warmest month is August, with an average maximum temperature of 92 degrees Fahrenheit. The average annual rainfall is 14.71 inches, with 91 percent falling from November through April., Airflow plays an important role in the movement and dispersion of air pollutants in the San Luis Obispo region. The speed and direction of local winds are controlled by 1) the location and strength of the Pacific High pressure system and other global patterns, 2) topographical factors, and 3) circulation patterns resulting from temperature differences between the land and sea. During the spring and summer, when the Pacific. High attains its greatest strength, onshore winds from the northwest generally prevail during the day. As evening approaches, onshore winds die down, and the wind direction reverses with weak winds flowing down the coastal mountains and valleys to form light easterly breezes. In the fall, onshore surface winds decline and the marine layer grows shallow, allowing an occasional reversal to a weak offshore flow. This, along with the diurnal alteration of land -sea breeze circulation, - can sometimes produce a "sloshing" effect. Under such conditions, pollutants may accumulate over the Pacific Ocean and subsequently be carried back onshore with the return of sea breezes. In the atmosphere, air temperatures normally decrease as altitude increases. At varying distances above the earth's surface; however, a reversal of this temperature gradient can occur. Such a condition, which is called an inversion, is simply a warm layer of air over a layer of cooler air. Inversions can have the effect of limiting the vertical dispersion of air pollutants, trapping them near the earth's surface. Several types of inversions are common to the San Luis Obispo area. Weak surface inversions are caused by radiational cooling of air in contact with the cold surface of the earth at night. In valleys and low-lying areas, this condition is intensified by the addition of cold air flowing down from hills and pooling on valley floors. Surface inversions are common throughout the County during winter months, particularly on cold mornings. As the morning sun warms the earth and air near the ground, the inversion lifts, gradually dissipating throughout the day. 3-7 r avt�o . CITY OF ATASCADERO INITIAL STUDY During the summer, subsidence inversions can occur when the summertime presence of the Pacific high-pressure cell can cause the air mass aloft to sink. As the air descends, compressional heating warms the air to a higher temperature than the air below. This highly stable atmospheric conditioning can act as a nearly impenetrable lid to the vertical mixing of pollutants. Subsidence inversions can persist for one or more days, causing air stagnation and the buildup of pollutants. Air Pollution Control Air pollution control is administered on three governmental levels in the project area. The United States Environmental Protection Agency (EPA) has jurisdiction under the Federal Clean Air Act to develop Federal air quality standards and to require individual states to prepare State Implementation Plans (SIPs) to attain these standards. The California Environmental Protection Agency Air Resources Board (ARB) has jurisdiction under the California Health and Safety Code and the California Clean Air Act to develop California air quality . standards, to require regional plans to attain these standards, and to coordinate the preparation by local air districts of plans required by both the Federal and State Clean Air Acts. ARB is also responsible for the development of state emission standards for mobile and stationary emission sources. The APCD shares responsibility with the ARB for ensuring that all State and Federal ambient air quality standards are attained within the County. The APCD has jurisdiction under the California Health and Safety Code to develop emission standards for the County, issue air pollution permits, and require emission controls for stationary sources in the County. Additionally, the APCD is also responsible for the attainment of State and Federal air quality standards in the County. Air Quality Standards Air quality standards are specific concentrations of pollutants that are used as thresholds to protect public health and the public welfare. The U.S. Environmental Protection Agency (EPA) has developed two sets of standards; one to provide an adequate margin of safety to protect human health and the second to protect the public welfare from any known or anticipated adverse effects. At this time, sulfur dioxide is the only pollutant for which the two standards differ. ARB has developed air quality standards for California, which are generally lower in concentration than the Federal standards. California standards exist for ozone, carbon monoxide, nitrogen dioxide, PM10, visibility, sulfates, lead, hydrogen sulfide and vinyl chloride. In July 1997, the EPA finalized new health -based ozone and particulate matter (PM) standards. However, due to several lawsuits the standards were not fully implemented until February 2001. The new Federal ozone standard is based on a longer averaging period (8 -hour vs. 1 -hour), recognizing that prolonged exposure is more damaging. The new Federal PM standard is based on finer particles (2.5 microns and smaller vs. 10 microns and smaller), recognizing that. finer MR CITY OF ATASCADERO INITIAL STUDY particles may have a higher residence time in the lungs and cause greater respiratory illness. In 2002, the ARB lowered the annual standards for PM10 and PM2.5 in response to the Children's Environmental Health Protection Act. Table 3.3-1 lists the applicable State and Federal air quality standards. Table 3.3-1. Ambient Air Quality Standards IVULCS. ppm - parts per million pg - micrograms Effects of Air Pollution The primary chemical compounds that are considered pollutants emitted into or formed in the atmosphere include ozone, oxides of nitrogen, sulfur dioxide, hydrocarbons, carbon monoxide, and particulate matter. Ozone is formed in the atmosphere through a complex series of chemical reactions generally requiring light as an energy source. Ozone is a pungent, colorless gas that is a strong irritant and attacks the respiratory system. Respiratory and cardiovascular diseases are aggravated by exposure to ozone. A healthy person exposed to high concentrations of ozone may experience nausea, dizziness, and buming in the chest. Ozone also damages crops and other vegetation. Oxides of nitrogen (NOx), which are considered pollutants, include nitric oxide (NO) and nitrogen dioxide (NO2). NO is colorless. and odorless and is generally formed by combustion processes combining atmospheric oxygen and nitrogen. NO2 is a reddish -brown irritating gas formed by the combination of NO and oxygen in the atmosphere or at the emission source. Both NO and NO2 are considered ozone precursors because they react with hydrocarbons and oxygen to produce ozone. Exposure to NO2 may increase the potential for respiratory infections in children and cause difficulty in breathing even among healthy persons and especially among asthmatics. 3-9 AveraginTime-, me " state standard . `. "Federal Standard 1 -Hour 0.09 ppm — Ozone 8 -Hour — 0.08 ppm 1 -Hour 20 ppm 35 ppm Carbon Monoxide (CO) 8-Hour 9.0 ppm 9.0 ppm Nitrogen Dioxide (NO2) 1 -Hour 0.25 ppm — Inhalable Particulate Matter 24 -Hour — 65 ug/m3 (PM2.5) Annual Arithmetic Mean 12 ug/m3 15 ug/m3 Inhalable Particulate Matter 24 -Hour 50 ug/m3 150 ug/m3 (PM10) Annual Arithmetic Mean 20 ug/m3 50 ug/m3 1 -hour 0.25 ppm — Sulfur Dioxide (SO2) 24 -Hour 0.04 ppm 0.14 ppm IVULCS. ppm - parts per million pg - micrograms Effects of Air Pollution The primary chemical compounds that are considered pollutants emitted into or formed in the atmosphere include ozone, oxides of nitrogen, sulfur dioxide, hydrocarbons, carbon monoxide, and particulate matter. Ozone is formed in the atmosphere through a complex series of chemical reactions generally requiring light as an energy source. Ozone is a pungent, colorless gas that is a strong irritant and attacks the respiratory system. Respiratory and cardiovascular diseases are aggravated by exposure to ozone. A healthy person exposed to high concentrations of ozone may experience nausea, dizziness, and buming in the chest. Ozone also damages crops and other vegetation. Oxides of nitrogen (NOx), which are considered pollutants, include nitric oxide (NO) and nitrogen dioxide (NO2). NO is colorless. and odorless and is generally formed by combustion processes combining atmospheric oxygen and nitrogen. NO2 is a reddish -brown irritating gas formed by the combination of NO and oxygen in the atmosphere or at the emission source. Both NO and NO2 are considered ozone precursors because they react with hydrocarbons and oxygen to produce ozone. Exposure to NO2 may increase the potential for respiratory infections in children and cause difficulty in breathing even among healthy persons and especially among asthmatics. 3-9 CITY OF ATASCADERO INITIAL STUDY Sulfur dioxide (SO2) is a colorless, pungent, irritating gas which affects the upper respiratory tract. Sulfur dioxide may combine with particulate matter and settle in the lungs, causing damage to lung tissues. Sulfur dioxide may combine with water in the atmosphere to form sulfuric acid that may fall as acid rain, damaging vegetation. Hydrocarbons include a wide variety of compounds containing hydrogen and carbon. Many hydrocarbons (known as reactive organic gases [ROG]) react with NO and NO2 to form ozone. Generally, ambient hydrocarbon concentrations do not cause adverse health effects directly, but. result in ozone formation. Carbon monoxide (CO) is a colorless, odorless gas generally formed by incomplete combustion of hydrocarbon -containing fuels. Carbon monoxide does not irritate the respiratory tract, but does interfere with the ability of blood to carry oxygen to vital tissues. Particulate matter consists of a wide variety of particle sizes and composition. Generally, particles less .than 10 microns (PM10) are considered to be pollutants because they accumulate in the lung tissues and may contain toxic materials which can be absorbed into the system. Baseline Air Quality Air quality in San Luis Obispo County is currently monitored at eight public agency and private sector monitoring stations located throughout the County. The nearest station is located in Atascadero (Lewis Avenue) approximately 500 feet northwest of the project site. The Atascadero station monitors ozone, carbon monoxide, nitrogen dioxide, PM10 and PM2_5 levels. Table 3.3-2 presents the maximum pollutant concentrations for 1 -hour and 8 -hour ozone and PM10 that were recorded at this station from 2003 through 2005. This summary is taken from APCD Air Quality Summary Data tables. Table 3.3-2. Summary of Air Quality Standard Exceedances Year.> 2003 ' 2004 2005 Ozone 1 -hour (ppm) Worst Hour 0.093 0.085 0.096 Number of State Exceedances (Days > 0.095 ppm) 0 0 1 Ozone 8 -hour (ppm) Worst 8 -hour Period 0.076 0.076 0.084 Number of State Exceedances (Periods > 0.085 ppm) 0 0 0 PMio (micrograms/cubic meter) Worst Sample 57.0 42.0 24.0 Number of State Exceedances (Samples>50 ug/m3) 1 0 .0 Source: San Luis Obispo APCD 3-10 CITY OF ATASCADERO INITIAL STUDY San Luis Obispo County has been identified as a non -attainment area PM10 by the ARB. San Luis Obispo County has been designated a non -attainment area for the State 1 -hour ozone standard since 1988. However, on December 5, 2003 the ARB proposed re -designating the County as attainment because no ozone violations had been recorded during 2000-2003, and that the County should be treated separately than the rest of the South Central Coast Air Basin due to minimal ozone transport associated with intervening mountain ranges. The proposed re- designation to attainment was finalized in January 2004; however, for 2007, non -attainment for ozone is proposed due to an ozone violation and will eventually be reviewed and finalized (ARB, 2006). Maximum concentrations of other criteria pollutants are currently within Federal and State standards. Air Quality Management The California Clean Air Act (CCAA), adopted in 1988, requires all air pollution control districts and air quality management districts in the state to adopt and enforce regulations to achieve and maintain air quality that is within the State air quality standards. San Luis Obispo County was declared a "moderate" nonattainment area for the State ozone standard. The County did not meet the December 31, 1997 deadline to attain the State 1 -hour ozone standard; therefore, should have been reclassified as a "serious" nonattainment area. However, the ARB determined that a change in classification would not result in a more expeditious attainment of the standard. The County is also considered a nonattainment area for the State PM10 standard. In response to the requirements of the CCAA, the APCD prepared the 1991 Clean Air Plan (('AP) to provide a framework for the attainment of State air quality standards by the earliest practicable date. The CAP is a comprehensive planning document intended to facilitate attainment and maintenance of the State ozone standard. The 1995 CAP was developed as a comprehensive update to the 1991 CAP and was expected to bring the County into attainment of the State ozone standard by the end of 1997. The 1995 CAP described the pollutants that affect County air quality, the sources of those pollutants, and future year emissions that are anticipated under current growth trends. Based on this information, the 1995 CAP also provides a control strategy for reducing emissions of ozone precursors. Included in the 1995 CAP are a number of land. use and circulation management policies and programs that have already been implemented to reduce vehicular air emissions. Additional measures recommended for adoption include trip reduction programs and telecommuting. A second update to the 1991 CAP was developed in 1998, as a continuation of the 1995 CAP and proposes no new control measures for adoption. The 1998 CAP was expected to bring the County into attainment with the State 1 -hour ozone standard by 2003. The CAP was revised again in 2001, but did not include any new emissions control measures. However, emissions of ROG and NOx are expected to decline through the year 2015. Due to the lack of recorded violations of the State 1 -hour ozone standard, San Luis Obispo County was re -designated an attainment area in January 2004. 3-11 CITY OF ATASCADERO INITIAL STUDY San Luis Obispo County is in attainment of the Federal air quality standards and is not subject to the planning requirements of the Federal Clean Air Act. Thresholds of Significance Significance thresholds have been developed by the San Luis Obispo County APCD and are documented within the CEQA Air Quality Handbook (San Luis Obispo County APCD, 2003). Specifically, project emissions are considered potentially significant impacts if any of the following thresholds are exceeded: 1.. Operational Impacts: Reactive Organic Gases (ROG), NO.,, SO2, PM,o 10 lbs/day CO 50 lbs/day The APCD considers impacts significant and requires more stringent environmental review for projects exceeding 25 lbs/day of ROG, NO.,, SO2 and PM,o emissions, or 550 lbs/day CO emissions. 2. Construction Impacts: ROG and NO, PM10 185 Ibs/day or 2.5 tons/quarter 2.5 tons/quarter The APCD requires Best Available Control Technology for construction equipment (CBACT) for projects with ROG or NOx emissions between 2.5 and 6.0 tons per quarter and requires CBACT plus further mitigation for projects with emissions exceeding 6.0 tons per quarter. 3. Air Quality Standards: A project is considered to have a significant impact if its emissions are predicted to cause or contribute to a violation of any ambient air quality standard. 4. Consistency. Large projects must be found to be consistent with the District's Clean Air Plan (CAP). The APCD notes that a consistency analysis is required for the following types of projects:. general plan updates and amendments, specific plans, area plans, large residential subdivisions and large commercial/industrial developments. The proposed project is not considered a large residential subdivision or large commercial development; therefore, a CAP consistency analysis is not required. 5. Odors: APCD Rule 402 states "A person shall not discharge from any source whatsoever such quantities of air contaminants or other material which cause injury, detriment, nuisance or annoyance to any considerable number of persons or to the public, or which endanger the comfort, repose; health or safety of any such persons or the public, or which cause, or have a natural tendency to cause,'injury or damage to business or property." Violation of Rule 402 is considered a significant impact. 3-12 Answers to Checklist Questions Question A: CITY OF ATASCADERO INITIAL STUDY The proposed project would not result in an increase in population and would not create substantial operational emissions. Although there was one recorded ozone violation recorded at the Atascadero (Lewis Avenue) monitoring station in 2005, the nature of the project does not lend itself to significant operational emissions and thus would not exacerbate the likelihood of further exceedances. Rather, the project would result in a return to City Hall administrative operations prior to the 2003 San Simeon Earthquake. It would not conflict with or obstruct implementation of the APCD's CAP. Questions B and C: Due to the age of the City Hall, there is a strong possibility that materials slated for removal and replacement contain asbestos and lead which could potentially become airborne; therefore, mitigation measures addressing the sampling and safe removal and disposal of these materials would be implemented .(see Mitigation Measures AQ -1 and AQ -2). The APCD indicates that buildings built before 1984 may contain asbestos -containing building materials. San Luis Obispo County was recently designated an attainment area for the State and Federal ozone standards. However, ozone concentrations in the project area exceeded applicable standards once in 2005; therefore, non -attainment is proposed as of 2007. Construction activity would not generate significant amounts of pollutant emissions. Although painting activities would result in emissions of ROC and NOx (ozone precursors), significant amounts of paint would not be applied; therefore, significant levels of emissions would not occur. Question D: Project -related construction emissions would cause minor increases of existing pollutant concentrations at sensitive receptors in the project vicinity (see Questions B and C). No emissions would be directly generated by project operations. Question E: Proposed work will not result in the long-term generation of odors. Minor amounts of construction -related emissions may cause a short-term generation of odors, which could be considered objectionable by some employees and visitors at Sunken Gardens. However, construction activities would be short-term and odorous emissions would dissipate rapidly in the air with increased distance from the source. Unauthorized. personnel would not be allowed into construction areas. Potential odor impacts are considered less than significant. Mitigation Mitigation Measure AQ -1. Prior to construction, the contractor shall prepare and submit for approval, a health and safety plan for addressing asbestos issues. If asbestos is present, then 3-13 CITY OF ATASCADERO INITIAL STUDY the APCD may require preparation of an Asbestos Health and Safety Program and dust mitigation measures under guidance of the National Emission Standards for Hazardous Air Pollutants (NESHAP). The APCD has the local responsibility to regulate material containing more than 1 percent asbestos; therefore the City shall hire a licensed asbestos abatement contractor if asbestos is known to be present. Mitigation measures would include stabilization of debris by wetting and covering with plastic sheeting until they are removed. Furthermore, the contractor hired to perform clean-up shall submit an asbestos notification form to the APCD. Mitigation Measure AQ -2. Prior construction, the City shall employ a qualified, independent testing lab to conduct field sampling and lab testing of paint for detection of lead.. This will include removing paint samples from the building and testing for lead content. A report shall be prepared indicating areas of detected lead, and a subsequent Lead Work Plan shall be developed. If lead is detected, all loose paint and particles that could become airborne shall be scraped from the building within an enclosed area covered with plastic sheeting to prevent lead - containing particles from becoming airborne. With incorporation of mitigation, any potential lead exposure to the public is considered a less than significant impact. Finding With the incorporation of mitigation, the proposed project would result in less than significant impacts to air quality. b) Have a substantial adverse effect on any riparian habitat Less Than or other sensitive natural community identified in local or Potentially Significant Less Than No regional plans, policies, or regulations or by the California Significant with Significant Impact Initial Study 2006-0038 Impact Mitigation Impact City Hall Repair and Rehabilitation Project Incorporation 3.4. BIOLOGICAL RESOURCES — Would the project: a) Have a substantial adverse effect, either directly or ❑ through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife El F-1 0 Service? b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, or regulations or by the California Department of Fish and Game or US Fish and Wildlife Service? c) Have a substantial adverse effect on federally protected wetlands as defined by Section 404 of the Clean Water Act (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? d) Interfere substantially with the movement of any native El F-1 0 resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? e) Conflict with any local policies or ordinances protecting 3-14 biological resources, such as a tree preservation policy or ordinance? f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? SOURCES: Project Description; Project Plans Setting CITY OF ATASCADERO INITIAL STUDY The proposed project site is .located within the downtown area of the City and is contiguous to urban development to the north, south, east, and west. There are no significant native vegetative features on the site as the City. Hall grounds have been fully landscaped and planted with non-native evergreen conifers and ornamentals. The site is approximately one acre in size and does not support any sensitive biological habitats or sensitive species. Answers to Checklist Questions Question A: Due to the nature of the site's physical characteristics, no sensitive or special -status species would be anticipated to occur on the site. Question B: No riparian habitats exist on the site. Question C: No wetland habitats exist on the site. Question D: Project construction would not interfere with the movement of migratory wildlife species. Question E: As there are no native trees on the project site, the Atascadero Tree Ordinance would not apply and the project would not conflict with the ordinance. However, any trees that may be removed during construction would be replaced following construction._ Question F: No adopted Habitat Conservation Plan, Natural Community Conservation Plan or other approved local, regional state habitat conservation plan is applicable for the subject property. 3-15 1171 The proposed project site is .located within the downtown area of the City and is contiguous to urban development to the north, south, east, and west. There are no significant native vegetative features on the site as the City. Hall grounds have been fully landscaped and planted with non-native evergreen conifers and ornamentals. The site is approximately one acre in size and does not support any sensitive biological habitats or sensitive species. Answers to Checklist Questions Question A: Due to the nature of the site's physical characteristics, no sensitive or special -status species would be anticipated to occur on the site. Question B: No riparian habitats exist on the site. Question C: No wetland habitats exist on the site. Question D: Project construction would not interfere with the movement of migratory wildlife species. Question E: As there are no native trees on the project site, the Atascadero Tree Ordinance would not apply and the project would not conflict with the ordinance. However, any trees that may be removed during construction would be replaced following construction._ Question F: No adopted Habitat Conservation Plan, Natural Community Conservation Plan or other approved local, regional state habitat conservation plan is applicable for the subject property. 3-15 Findings CITY OF ATASCADERO INITIAL STUDY No mitigation is necessary and the proposed project would result in no impacts to biological resources. Less Than Potentially Significant Less Than No Significant with Significant Impact Initial Study 2006-0038 Impact Mitigation Impact p City Hall Repair and Rehabilitation Project Incorporation 3.5. CULTURAL RESOURCES — Would the project: a) Cause a substantial adverse change in the significance of '15064.5? a historical resource as defined in b) Cause a substantial adverse change in the significance of '15064.5? an archaeological resource pursuant to c) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? d) Disturb any human remains, including those interred outside of formal cemeteries? SOURCES: Project Description, California Cultural and Historical Endowment, Review and Evaluation of Significance of Impacts — Repair and Rehabilitation of Atascadero City Hall, Robert Bruce Anderson, Thomas Rex Hardy, December 2006. Introduction The City contracted with Robert Bruce Anderson, Urban Conservation & Urban Design and Thomas Rex Hardy, AIA, Historical Architect, both of whom meet the professional qualification standards used by the National Park Service and as published in the Code of Federal Regulations, 36 CFR Part 61 to perform identification, evaluation, registration, and treatment activities for historical resources, including historic preservation and methods. Their services were retained specifically for the purpose of conducting a detailed review and evaluation of the significance of the project's impacts regarding the proposed repair and rehabilitation of the City Hall, as identified in the project description, and per the requirements of CEQA. Mr. Anderson is an urban designer and conservationist who specializes in the interpretation and use of design standards and guidelines with respect to historic properties and cultural landscapes. Mr. Hardy is a registered architect in the State of California whose practice focuses on the design, materials, and adaptive use of historic structures. Mr. Anderson and Mr. Hardy meet the Secretary of Interior's Professional Qualifications Standards for Historic Architecture, Historic Preservation Planning and/or Architectural History per the Code of Federal Regulations, 36 CDF Part 61. Mr. Robert Bruce Anderson and Thomas Rex Hardy, AIA, prepared a report entitled "Review and Evaluation of Significance of Impacts — Repair and Rehabilitation of Atascadero City Hall", 2006, to review and evaluate the potential impacts(s) of the proposed project (first phase) on the historical significance of City Hall. See Appendix B. This review and evaluation was conducted pursuant to Section 15064.5, Article 5, of CEQA Guidelines, "Determining the Significance of Impacts on Historical and Unique Archaeological Resources." and specifically to paragraph 3-16 CITY OF ATASCADERO INITIAL STUDY (b)(3) of Section 15064.5: "Generally, a project that follows The Secretary of Interior's Standards for the Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring and Reconstructing Historic Buildings or the Secretary of the Interior's Standards for Rehabilitation and Guidelines for Rehabilitating Historic Buildings (Weeks and Grimmer, 1995), shall be considered as mitigated to a level of less than significant impact on the historical resources". Table 3.5-1 outlines the 55 work items that constitute the first phase of the project to repair and rehabilitate the City Hall. Setting The City Hall, also known by its historic name, Administration Building, is an extraordinary civic edifice that was designed by Walter D. Bliss of the prominent San Francisco office of Bliss & Faville. The general contractor for the building was F.G. Engstrum. The building was erected beginning in 1914, was completed in 1918, and was intended to serve as the administrative, symbolic and architectural centerpiece of the Atascadero Colony, a planned community that was envisioned by the publisher and entrepreneur, Edward Gardner Lewis. The City Hall is a four-story domed structure, consisting of approximately 58,854 gross square feet of floor area. Its architectural style indicates derivation from Italian Renaissance sources, an influence also evident in the architecture of several other Bliss & Faville buildings. Below the fourth floor, the building's structural systems consist of reinforced concrete floors and columns and unreinforced masonry infill walls. Above the fourth floor, the structural systems consist of wood floor and roof framing supported on unreinforced masonry bearing walls. The building is raised on a podium foundation, and the building's distinctive plan is characterized by the commanding presence of two rotundas, on the first and fourth floors. The building's exterior is clad with a textured yellow brick, offset with terra cotta and marble ornament. The domed roof is the and the lower roofs are composition. The eaves on the rile roof are wood. Most of the windows are double -hung with wood sash, the noticeable exception being the circular wood -sash windows on the third floor above the entries on Palma and Lewis Avenues. Terra cotta is used to frame pedimented entries, and to finish arches, Ionic columns, entablatures and soffits at entries. Allegedly all of the bricks used in construction of City Hall were fabricated at a local brick plant located at the base of Pine Mountain, facing the Salinas River and close to where Curbaril Avenue crosses the railroad tracks. The interior of City Hall consists primarily of three floors of circular corridors and offices which surround a 40 -foot high, first floor rotunda; and a fourth floor with a meeting room, apartment, kitchen and storage rooms which surround a 44 -foot high, fourth floor rotunda. In contrast to the first three floors, the fourth floor lacks a circular corridor. The Palma and Lewis Avenue entries feature two-story lobbies. The basement contains mechanical equipment rooms, service areas and storerooms. 3-17 Table 3.5-1. Repair and Rehabilitation Impact Evaluation CITY OF ATASCADERO INITIAL STUDY No. SCOPE ITEM Zone Reference Procedure Impact(s) Condition/Repair Symbol RESTORATION WORK I. EXTERIOR CLADDING a. Exterior Finish Repairs 1 Pin Loose decorative Pr vll; page G-4 BS/DP Remove material to 1-1/2" depth; install This action is unlikely to have any terra cotta Dutchman patch using minimum two appreciable impact since it repairs stainless steel anchors into substrate with historic materials in an appropriate solid bed joint. Color match mortar at manner, consistent with The perimeter of patch. Secretary's Standards and Guidelines. 2 Repair decorative terra Pr vll; p. G-3 GS/C Remove loose and deteriorated glaze This action is unlikely to have any cotta glaze and bisque coating. Install new glaze coating to match appreciable impact since it repairs spalls existing. historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. 3 Rebuild displaced Pr vll; p. G-5 Remove masonry in area. Salvage terra This action is unlikely to have any masonry triangle/RM cotta and uncracked face brick for reuse. appreciable impact since it repairs Epoxy bond and pin together cracked historic materials in an appropriate pieces of terra cotta. Epoxy inject cracks in manner, consistent with The backup wall where indicated. Rebuild Secretary's Standards and masonry to match appearance of original Guidelines. facade. Replace individual units where indicated. Coordinate structural work. 3-18 CITY OF ATASCADERO INITIAL STUDY No. SCOPE ITEM Zone Reference Procedure Impacts) Condition/Repair Symbol � �, • , � `� � u 4 Patch s alled brick p Pr. vll; G-6 S/P &DP p' For repair.symbol: P Patch terra cotta as described for the This action is unlikely to have any condition BS. appreciable impact since it repairs Remove loose and deteriorated material to historic materials in an appropriate a sound substrate. Square off perimeter of manner, consistent with The patch area, do not overrun cuts. Minimum Secretary's Standards and patch depth shall be 3/4". At corroded steel Guidelines. reinforcing remove material to expose all sides of bar. Clean exposed reinforcing by sandblasting, install rust -inhibitive coating. Install color -matched patching mortar in two lifts. Cure patch for seven days with plastic covering. For repair symbol: DP Dutchman patch material to match existing color and texture of substrate. Remove sound and unsound material to minimum depth of 1 1/2". Install Dutchman using a minimum of two stainless steel anchors into the substrate and with a solid bed joint. Install color -matched patching mortar at the perimeter of patch. 5 Remove and replace Pr vll; p.G-7 D/P Remove loose and deteriorated material to sound substrate. Remove material to This action is unlikely to have any damaged parge coating expose all sides of corroded steel. appreciable impact since it repairs Sandblast exposed reinforcing steel and historic materials in an appropriate apply rust -inhibitive coating. Minimum patch manner, consistent with The depth of3/4". Square off perimeter of patch Secretary's Standards and area avoiding overrun cuts. Install color Guidelines. matched patching mortar in two lifts. Cure patch for seven days with plastic covering. 6 Inject epoxy into cracked Pr vll; p. G-8 C/RP & I For repair symbol: RP Grind crack to profile of 1/2" wide by 3/4" This action is unlikely to have any brick and terra cotta deep. Point crack with mortar to match.color appreciable impact since it repairs 3-19 CITY OF ATASCADERO INITIAL STUDY No SCOPE (TEMP _,; Zona Reference .: Condition/Repair Symbol Procedure w '; Impact(s) and texture of substrate. historic materials in an appropriate Coat crack repairs in terra cotta with glaze manner, consistent with The repair coating. Secretary's Standards and For repair symbol: I Guidelines. Inject crack with epoxy. Unless specifically required, do not rout crack. Apply surface seal to crack that will not mar the existing finished surface of the terra cotta, brick or cast.stone. Install injection ports in mortar 'joints or use surface mounted ports. 7 Repoint open mortar Pr vll; p. G-16, 26-28 Remove sound and unsound mortar from . This action is unlikely to have any joints in brick and terra 1,2,3 joint to a minimum depth %". Remove appreciable impact since it repairs cotta additional unsound mortar as required until historic materials in an appropriate sound mortar is encountered. Install manner, consistent with The pointing mortar in 3/8" lifts beginning at the Secretary's Standards and back of the joint. A minimum of two lifts is Guidelines. . required. W ID Replace 12 missing Pr stone pieces Prep and. paint exposed Pr steel lintels vll; p. G-12 MS/None vll; p. G-30 i Install new stone pieces, to match original installation. Prepare and paint all steel window and door lintels 3-20 This action is unlikely to have any appreciable impact since it repairs historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. This action is unlikely to have any appreciable impact since it is a routine maintenance action that restores the appearance and weather protection of the original paint coatings. CITY OF ATASCADERO INITIAL STUDY No. SCOPE ITEM Zone Reference Procedure Impact(s) Condition/Repair Symbol 10 Remove mortar Pr vll; p. G-15 Remove mortar by scraping with stainless This action is unlikely to have any droppings on surface of None/Typical steel scraper. Patch all exposed BS and appreciable impact since it repairs terra cotta from previous fagade repair 7 GS as described elsewhere. historic materials in an appropriate repair work manner, consistent with The Secretary's Standards and Guidelines. 11 Repair cast stone Pr vll; p. G-33 Remove and replace cast stone bases of all This action is unlikely to have any column bases freestanding and engaged columns at each appreciable impact since it repairs elevation. historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. b. Exterior Doors and Frames 1 Replace non -historic Pr Drawing: A111 MOD New Hope's steel doors and transoms to be The new doors and transoms are aluminum entrance configured in sizes and patterns to match likely to be compatible and doors with new Hope's historic patterns. appropriate, since they eill be metal doors and designed and fabricated to match transom to match the historic pattern of divisions and historic pattern munt'ins clearly visible in historic photographs. 2 Reconfigure existing Pr Drawings: Cut opening and reconfigure masonry at Precise details will not be available exterior masonry to A1111 MOD & R7 south corner similar to door at opposite until first phase DD work is match opposite corner corner on west corner. completed, but this action is due to door intended to result in an alteration replacement. similar to the alteration made previously at the opposite corner. 3-21 CITY OF ATASCADERO INITIAL STUDY No. SCOPE ITEM Zone Reference Procedure Impact(s) Condition/Repair Symbol 3 Prepare and paint Pr vll; p. G-30 Prepare and paint steel door lintels. This routine maintenance action is existing door lintels unlikely to have any appreciable impact since it restores the appearance and weather protection of the original paint coatings. C. Exterior Soffits 1 Prepare and paint Pr vll; p. G-29 Prepare and paint wood components of roof This routine maintenance action is peeling roof eaves eaves. unlikely to have any appreciable impact since it restores the appearance and weather protection of the original paint coatings. 2 Prepare and paint Pr vll; p. G-34 Prepare and paint exterior plaster ceilings This routine maintenance action is peeling exterior plaster and soffits. unlikely to have any appreciable ceilings at entries impact since it restores the appearance and weather protection of the original paint coatings. d. Exterior Balustrades, Parapets and Roof Screens 1 Install epoxy pin anchors Pr vll; p. G-39 Drawing Remove tie -wires between terra cotta and This action is unlikely to have any in cracked terra cotta R8 metal bracing. Install new terra cotta appreciable impact since it repairs balustrades anchors. historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. 2 Repair terra cotta glaze Pr Vii; p. G-3 GS/C Remove loose and deteriorating glaze This action is unlikely to have any coating. Install new glaze coating to match appreciable impact since it repairs 3-22 CITY OF ATASCADERO . INITIAL STUDY No. SCOPE ITEM Zone Reference Condition/Repair Symbol Procedure w r Impact(s) spalls existing. historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. 3 Replace terra cotta p Pr vll; G-4 6 BS/P & For repair symbol: P For smaller spalls: Remove sound and This action is unlikely to have any blocks that have DP unsound terra cotta at the spall location to appreciable impact since it repairs significant spalls form a square; 1/2" deep patch. Install historic materials in an appropriate color -matched patching mortar in two lifts. manner, consistent with The Cure patch with plastic covering. Apply Secretary's Standards and. glaze coating to patch. Guidelines. For larger spalls: Remove loose and deteriorated material to a sound substrate. Square off perimeter of patch area, do not overrun cuts. The minimum patch depth shall be 3/4". At corroded steel reinforcing remove material to expose all sides of the bar. Clean exposed reinforcing by sandblasting, install rust -inhibitive coating. Install color - matched patching mortar in two lifts. Cure patch for seven days with plastic covering. For repair symbol: DP Dutchman patch material to be terra cotta salvaged from other building locations or new terra cotta to match existing color and texture of substrate. Remove sound and unsound terra cotta to minimum depth of 1 1/2". Install Dutchman using a minimum of two stainless steel anchors into the substrate and with a solid bed joint. Install colormatched patching mortar at the perimeter of the patch. 3-23 CITY OF ATASCADERO INITIAL STUDY No. SCOPE ITEM Zone Reference Procedure Impacts) Condition/Repair Symbol 4 Inject epoxy into terra p y Pr vll G-5 p' Remove masonry in the area indicated on drawings. Salvage terra cotta and This action is unlikely to have any cotta and brick cracks triangle/RM uncracked face brick for reuse. Epoxy bond appreciable impact since it repairs and pin together cracked pieces of terra historic materials in an appropriate cotta. Epoxy inject cracks in backup wall manner, consistent with The where indicated. Secretary's Standards and Rebuild masonry to match appearance of Guidelines. original facade. Where indicated by Blk or Brk replace individual terra cotta or cast stone blocks or individual bricks 5 Repair the existing steel Pr Drawings: SR2.5; Add 6 x 6 TS vertical parapet bracing. This action is unlikely to have any balustrade bracing R8 appreciable impact since it is located on the inside of the upper parapet walls and will not have any visual impact from any public right- of-way. 6 Install new parge coating Pr vll; p. G-36 Install new cement plaster parge coating at This action is unlikely to have any at top surface of brick top surface of brick parapet on the exterior appreciable impact since it repairs parapet side of the balustrade. historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. 7 Repoint terra cotta joints Pr vll; p. G-37 Repoint 100% of joints in terra cotta blocks This action is unlikely to have any at balustrade Drawings R2 -R7 of balustrade and top surface of 4th floor appreciable impact since it repairs water table. historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. 3-24 CITY OF ATASCADERO INITIAI RTI MV No. SCOPE ITEM i,, Zone Reference Procedure Impact(s) Condition/Repair Symbol 8 Clean organic growth on Pr vll; p. G-13 OG/CI Clean area with warm water, low-pressure This action is unlikely to have any balustrade Drawings R2 -R7 rinse. Scrub areas with organic growth appreciable impact since it cleans using natural fiber, bristle brush. Follow up historic materials with the gentlest at areas with remaining organic growth with means, consistent with The diluted citric acid cleaning. Secretary's Standards and Guidelines. 9 Remove CMU infill in Pr vll; p. G-38 Drawing Remove existing concrete block infill in The original spacing, proportions balustrade and replace R8 balustrade and install new terra cotta and profiles of the historic balusters can be discerned from historic with new terra cotta balusters with appropriate spacing of 9" o.c. photographs, so balusters to match Reconstruction of these missing historic pattern element is an appropriate treatment consistent with The Secretary's Standards and Guidelines. A discrete mark can be fabricated on each new Baluster to indicate the date of installation as restoration work. e. Miscellaneous Exterior Work 1 Prep and Paint all cast Pr vl; p. 282 Prepare and paint column bases. This action is unlikely to have any stone appreciable impact. 2 Clean off all Pr vll; p. 14 EFF/CI Clean area with warm water, low pressure This action is unlikely to have any efflorescence Drawings R2 -R7 rinse. Scrub areas with efflorescence using appreciable impact since it cleans natural fiber bristle brush. Follow-up at historic materials with the gentlest areas with remaining efflorescence with means, consistent with The diluted citric acid cleaning. Secretary's Standards and Guidelines. 3-25 CITY OF ATASCADERO INITIAL STUDY Nd SCOPE ITEM Zone Reference Procedure impact(s)`. Condition/Repair s f' Symbol x 3 Clean off all water stains Pr WS -CI Drawings Clean area with warm water, low pressure This action is unlikely to have any R2 -R7 rinse. Scrub areas with water stains using appreciable impact since it cleans natural fiber bristle brush. Follow-up at historic materials with the gentlest areas with remaining water stains with means, consistent with The diluted citric acid cleaning. Secretary's Standards and Guidelines. 4 Clean off all organic Pr vll; p. 13, 24 OG/CI Clean area with warm water, low pressure growth & CT Drawings R2- rinse. Scrub areas with organic growth R7 using natural fiber bristle brush. Follow-up at areas with remaining organic growth with diluted citric acid cleaning. This action is unlikely to have any appreciable impact since it cleans historic materials with the gentlest means, consistent with The Secretary's Standards and Guidelines. II. 1 ROOFING, WATERPROOFING & SKYLIGHTS a. Install below grade Fr vll. Appendix H Install below grade membrane This action is contingent on membrane waterproofing to foundation walls [in approval for re -leveling building in waterproofing to conjunction with structural re -leveling of the other phases and will not occur if foundation walls building]. the building is not re -leveled. If implemented, this action would not be visible, since it would occur below grade and is unlikely to have any appreciable impact. M Clean fascia flashing atI Fr I vlf. Appendix H roofing Clean fascia flashing at roofing This routine maintenance action is unlikely to have any appreciable impact. c. I Fasten uncompleted Fr ( vil; p. G-22 LID/SDRemove strainer. Secure clamping ring. IT repair action is unlikely to have I 3-26 C vawro..S CITY OF ATASCADERO IAWMAI 0 rl lrl%Z No. SCOPE ITEM Zone Reference Procedure Impact(s) Condition/Repair s, 'Symbol11 t1V roof drains any appreciable impact. d. Add bird stop Fr vll. Appendix H Add metal screen bird stop in one location This action is unlikely to have any on roof. appreciable impact. e. Remove and replace all Pr Drawing: Al 14MOD Remove and replace all painted glass in The impact is likely to range from painted glass in upper upper rotunda dome ceiling with new neutral to positive. rotunda dome ceiling translucent tempered glass to match historic with new translucent pattern. (This procedure does not restore tempered glass to match the original skylight at the upper rotunda historic pattern dome roof). f. Restore skylights above Fr Drawing: Al 14MOD Restore visual effect of skylight openings The impact is likely to range from two main staircases above two main staircases at fourth floor. neutral to positive. g. Miscellaneous caulking All vll. Appendix H This covers caulking and sealing throughout This maintenance action is unlikely and sealing the building as necessary to implement all to have any appreciable impact. scope items in this phase. III. INTERIOR PARTITIONS, DOORS & GLAZING a. Partitions 1 Recreate overlooks into Pr Drawing: Al 12MOD Reopen existing overlooks into lower This action is intended to return to first floor rotunda rotunda. Restore damaged plaster at the original design intent and existing infill walls. character of the rotunda. The impact is likely to range from neutral to positive. 2 Construct light boxes at Pr Drawing: Al 13MOD Construct light boxes behind lunette The intent is to maximize previous clerestory windows in lower rotunda. (Light boxes will appreciation of the rotunda space. 3-27 CITY OF ATASCADERO INITIAL STUDY No., SCOPE ITEM Zone Reference Procedure Impact(s) Condition/Repair Symbol locations in lower be in interstitial space, not visible from The impact is likely to range from rotunda public spaces.) neutral to positive. 3 Construct light boxes at Pr A500, A501 Construct light boxes behind lunette The intent is to maximize previous clerestory windows in upper rotunda. (Light boxes will appreciation of the rotunda space. locations in upper be in interstitial space, not visible from The impact is likely to range from rotunda public spaces.) neutral to positive. b. Balustrades & Rails 1 Reopen overlooks into Pr Drawing: Al 12MOD Re -open overlooks into first floor rotunda This action is intended to return to first floor rotunda that were enclosed by plastered partitions at the original design intent and including demo, rebuild an unknown time. Restore missing or character of the rotunda. The railings, rebuild low wall damaged corner corbels and rebuild low impact is likely to range from and install glass guardrail wall. neutral to positive. 2 Remove existing railing Pr Drawing: A500; Remove non -historic railings on mezzanine This action is intended to return to and replace with new to Al5MOD in upper rotunda and replace with new the original design intent and match historic pattern railings to match historic patterns and character of the rotunda. The spacing as discerned from historic impact is likely to range from photographs. neutral to positive. DEFERRED MAINTENANCE INFRASTRUCTURE IV. FLOOR & ROOF STRUCTURE REPAIRS a. Repair spalled and - vII; Appendix H Repair damaged concrete slabs with epoxy This action unlikely to have any cracked concrete slabs injection and other appropriate means appreciable impact. and beans at the depending on condition. suspended floors 3-28 CITY OFATASCADERO INITIAL STUDY No. SCOPE ITEM Zone Reference Procedures Impact(s) Condition/Repair s �r Symbol b. Remove and replace Pr vll; Appendix H Remove and replace roof framing. This action unlikely to have any roof framing appreciable impact. C. Replace plywood Pr vll; Appendix H Replace plywood sheathing, utilizing great This action unlikely to have any sheathing at roof care in removal, storage and protection of appreciable impact. existing clay roof tiles during construction. d. Miscellaneous metal and All vll; Apendix H Include miscellaneous metal and blocking This action unlikely to have any blocking repairs as required throughout the building in order appreciable impact. to accomplish the work of this phase. V. PLUMBING SYSTEM REPAIRS a. Sanitary waste, vent and Fr vl; p. 372 Repair sanitary waste, vent, pipework. This action unlikely to have any service pipework repairs appreciable impact. b. Kitchen system repairs Fr vl; p. 372 Repair and improve equipment connections This action unlikely to have any including equipment and furnish required grease traps and appreciable impact. connections, grease fittings. waste fittings and grease interceptor C. Upgrade natural gas Fr vl; p. 372 Install natural gas shut off valves and This action unlikely to have any service including shut off upgrade pipework and fittings appreciable impact. valves, pipework and fittings VI. HEATING, VENTILATION & AIR CONDITIONING REPAIRS a. Replace HVAC air All A; p. 369 Control system for 4 -pipe fan coil system This action unlikely to have any distribution systems, 3-29 CITY OFATASCADERO INITIAL STUDY ,No'SCQPE ITEMZone Reference Procedure Impact(s)� Condition/Repair S Symbol l zoning & controls with 4 zones for entire building. appreciable impact. VII. ELECTRICAL LIGHTING, POWER & COMMUNICATION REPAIRS a. Upgrade main power Fr vl; p. 370 Upgrade main power and distribution This action unlikely to have any and distribution breakers breakers to (e) switchboard. appreciable impact. to (e) switchboard b.. Upgrade machine and Fr vl; p. 370 Upgrade machine and equipment power This action unlikely to have any equipment power connections, switches, conduit and cable. appreciable impact. connections, switches, conduit and cable C. Upgrade user Fr A; p. 370 Upgrade user convenience power This action unlikely to have any convenience power receptacles including conduit and cable, appreciable impact. receptacles including spot upgrades. conduit and cable, spot upgrades d. Install -new lighting Fr A500, A501 Install new lighting fixtures at upper and This action unlikely to have any fixtures at upper and lower rotunda light boxes, appreciable impact. lower rotunda light boxes e. Upgrade lighting control Fr vl; p. 370 Upgrade lighting control panels. This action unlikely to have any panels appreciable impact. f. Upgrade telephone/data Fr. vl; p. 370 Upgrade telephone/data outlets including This action unlikely to have any outlets including conduit conduit and cable, spot upgrades. appreciable impact. and cable, spot upgrades 3-30 Notes: CITY OF ATASCADERO INITIAL STUDY References are to the three volume "Damage Assessment & Rehabilitation Plan" dated April 4, 2005 by Pfeiffer Partners. Volumes I and n are bound volumes with written assessment, photographs and recommendations. Volume ill consists of drawings. Sheets R I -R 14 show scope, extent and locations of scope items. "The Secretary's Standards and Guidelines" refers to: "The Secretary of the Interior's Standards for the Treatment of Historic Properties with Guidelines for Preserving. Rehabilitating. Restoring & Reconstructing Historic Buildings" by Kay D. Weeks and Anne E. Grimmer. Key to Zones: (see text and diagrams of report section, Zoning of Character -Defining Features, for explanation as to meaning and use of zones). Pr Preservation Zone Re Rehabilitation Zone Fr Free Zone 3-31 CITY OF ATASCADERO INITIAL STUDY The first floor, or lower, rotunda is the defining and most impressive space of the building. The dome's coffered ceiling, the fluted Ionic columns that support the dome, the molded plaster chandelier suspended from a gilded central medallion, and four lunette windows cut into the base of the dome at the third floor are major contributors to this exceptionally grand space. The fourth floor, or upper, rotunda is an octagonal space which features eight square columns and 16 round columns with Corinthian capitals, a mezzanine level with plain railings, bays with round and double -hung wood -sash windows, and an octagonal -shaped painted glass laylight that terminates a dome ceiling covered with acoustical tile. The second and third floors of offices are accessed from stairs located adjacent to the circular corridors at south and west corners of the building, and- an elevator located within the two-story lobby at the Lewis Avenue entry. The fourth floor is accessible from a second set of stairs, located at northwest and southeast axis points on the circular corridor of the third floor. City Hall has experienced numerous alterations to its interior spaces since it first accommodated offices of the Atascadero Colony beginning in 1918. In large measure, these alterations are the result of numerous tenants who have occupied the building since its original construction. The building's alterations and tenants are chronicled in detail in the 1988 Historic Structures Report prepared for the City of Atascadero by the Office of Alice Carey, Architects. It is noteworthy that the structure's exterior has experienced relatively few alterations, the most obvious of which are the following: installation of non -historic glazing and doors at the four entries; demolition of historic building fabric at the west corner of the building, to accommodate installation of a new exit door at grade; installation of an accessibility ramp at the Lewis Avenue entry; and demolition of historic building fabric on the third floor of the Palma Avenue facade, to accommodate installation of four new windows. It should be noted that this last intervention, on the basis of historic photos, occurred early in the history of this building. Atascadero City Hall was listed in the National Register of Historic Places in 1977 (#77000336) and was registered in 1984 as California Historical Landmark No. 958. Zoning of Character -Defining Features The project analysis includes a series of zoning diagrams developed to assist the City, other public agencies, and the general public in understanding the historical importance of varying spaces and features within the building and its exterior elevations. This method provides a common sense approach to repair and rehabilitation work to damaged or previously altered portions of the City Hall, and allows the removal of non -historic elements and alterations. The- zoning hezoning diagrams (see Figures 3.5-1 through 3.5-9) are defined in conjunction with the text definitions for each of the following zones: Preservation Zone; Rehabilitation Zone; and Free Zone. 3-32 December 2006 Project No. 0602-2391 FZmie i Pve i 1i J b Source: Historical Significance Report, Anderson and Hardy 2006 ZONING OF CHARACTER -DEFINING FEATURES adre Existing Basement Level Floor Plan A ENGINEERS, GEOLOGISTS & ENVIRONMENTAL SCIENTISTS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-� December 2006 Project No. 0602-2391 __ _.. ___ Rrhnhilitn7inaT n� Source: Historical Significance Report, Anderson and Hardy 2006 ZONING OF CHARACTER -DEFINING FEATURES Aadre Existing First Floor Plan ssociates, inc. ENGINEERS, GEOLOGISTS & EWRONMENTA SOIENT STS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-2 December 2006 Project No. 0602-2391 Source: Historical Significance Report, Anderson and Hardy 2006 p0adre ZONING OF CHARACTER -DEFINING FEATURES 68aciates, inc. ExodsVng Second FIoor Plan ENGINEERS, GEOLOGISTS 6 0 ENVIRONMENTAL SCIENTISTS Atascadero City Hall Repair Project IS/MND MGURE 3.5-3 December 2006 Project No. 0602-2391 a:. 4:..� � .. F ire :.•ar i .. d - t �) Source: Historical Significance Report, Anderson and Hardy 2006 Nord? ZONING OF CHARACTER -DEFINING FEATURES Aadre Existing Third Floor Plan ssociates, inc. ENGINEERS, GEOLOGISTS & El ENVIRONMENTAL SCIENTISTS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-4 December 2006 Project No. 0602-2391 P, r r "Awn zonr Rchehiiitniiar, Z-onc t µ - U i F rfe Tarn U 1-�Ji r y - 1do►fi�i Source: Historical Significance Report, Anderson and Hardy 2006 ■� ZONING OF CHARACTER -DEFINING FEATURES PaoExisting Fourth Floor Plan ssciates, inc. ENGINEERS, GEOLOGISTS & ENVIRONMENTAL SVENTISTS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-5 December 2006 Project No. 0602-2391 NF'r�a6eiil��tu�,n Z.,nu� srtlor'!�t Source: Historical Significance Report, Anderson and Hardy 2006 ZONING OF CHARACTER -DEFINING FEATURES Existing Upper Rotunda Mezzanine Plan associates, inc. ENGINEERS, GEOLOGISTS A 13 ENVIRONMENTAL SCIENTISTS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-6 December 2006 Project No. 0602-2391 P:rt�r, RIV n Lan, itv}snbi}iEr.trc;> Z.o '�� ire Zany Norio Source: Historical Significance Report, Anderson and Hardy 2006 ZONING OF CHARACTER -DEFINING FEATURES P� re Existing Roof Plan ssociates,inc. ENGINEERS. GEOLOGISTS 6 ENVIRONMENTAL SCIENnSTS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-7 December 2006 Project No. 0602-2391 ..J Source: Historical Significance Report, Anderson and Hardy 2006 padre ZONING OF CHARACTER -DEFINING FEATURES associates, inc. Existing Section B ENGINEERS, GEOLOGISTS & 0 ENVIRONMENTAL SCIENTISTS Atascadero City Hall Repair Project IS/MND FIGURE 3.5-9 CI TY OF ATASCADERO INITIAL STIInY Zoning of character -defining features of Atascadero's City Hall can be an instructive tool to assist in the review and evaluation of significance of impacts of the project's first phase work items. It also can serve as a valuable tool in the formulation of design and program decisions yet to be made for the anticipated second and third phases of the project to repair and rehabilitate City Hall. Additionally, with the use of diagrams, zoning can present interested parties with a visual appreciation of a historic structure's character -defining spaces and elevations. Preservation Zone Character -defining features included in this category or zone are those that are to be PRESERVED and/or RESTORED. These features are of primary importance to sustain the historic integrity of the property, and thus should be appropriately repaired, maintained or reconstructed to match their original appearance and/or configuration. This zone also may include features that are not considered to be of primary importance, and, as such, do not warrant preservation or restoration. Particular care must be exercised when dealing with features within this category. For illustrative purposes, character -defining features included in this category are zoned in RED in the illustrated plans and sections (Figures 3.5-1 through 3.5- 9). (NB. As all of City Hall's exterior elevations are of primary importance and therefore fall entirely within this zone, zoning of the structure's exterior elevations is not illustrated in the diagrams that follow.) Guideline for project actions contemplated within this category, "Stop. Be very careful before proceeding". Rehabilitation Zone Character -defining features included in this category or zone are those that could be REHABILITATED. These features are of secondary architectural or historical significance, but nonetheless possess qualities or character that relate them to features of primary importance. Alteration of features in this category can be accommodated so long as the qualities or character that relate these features to features of primary importance are preserved, and the new work is visual]y compatible with features of primary importance. The character -defining features included in this category are zoned in YELLOW in the illustrated plans and sections. Guideline for project actions contemplated within this category, "Slow down and only proceed with caution". Free Zone Character -defining features included in this category or zone are those that are eligible for major RE -DESIGN or REMOVAL. These features may be viewed as being essential for use and enjoyment of the property; however, such features do not contribute to the property's historical significance or integrity. The size, placement and use of materials of these features can negatively affect or impact features of primary or secondary importance. Accordingly, while major alteration, re -design or removal of features within this zone is not of particular concern, care still must be exercised that such changes do not compromise or diminish the integrity of features of primary or secondary importance. The character -defining features included in this 3-51 CITY OF ATASCADERO INITIAL STUDY category are zoned in GREEN in the illustrated plans and sections. Guideline for project actions contemplated within this category, "You are free to proceed". Thresholds of Significance Based on the mandatory findings of significance criteria at Section 15065 and Appendix G of the State CEQA Guidelines (Governor's Office of Planning and Research, 1999), an impact would be significant if any of the following conditions, or potential thereof, would result with implementation of the Proposed Project: 1. Cause a substantial adverse change in the significance of a historical resource as defined in Section 15065.5; 2. Cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 15064.5; or, 3. Disturb any human remains, including those interred outside of formal cemeteries. Section 15064.5 defines a significant adverse effect to include any activity that would: (1) Create a substantially adverse change in the significance of a historical resource including physical demolition, destruction, relocation, or alteration of the resource or its immediate surroundings, such that the significance of a historical resource would be materially impaired; and/or (2) alter or materially impair the significance of a historical resource. Section 15064.5 of the CEQA Guidelines defines significant historic resources to include: A resource listed in, or determined eligible by the State Historical Resources Commission, for listing in the California Register of Historical Resources (Pub. Res. Code SS5024.1, Title 14 CCR, Section 4850 et seq.). A resource included in a local register of historical resources, as defined in section 5020.1(k) of the Public Resources Code or identified as significant in a historical resource survey meeting the requirements section 5024.1(g) of the Public Resources Code, shall be presumed to be historically or culturally significant. Any object, building, structure, site, area, place, record, or manuscript which a lead agency determines to. be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California may be considered to be a historical resource, provided the lead agency's determination is supported by substantial evidence in light of the whole record including the following: (A) Is associated with events that have made a significant contribution to the broad patterns of California's history and cultural heritage; (B) Is associated with the lives of persons important in our past; (C) Embodies the distinctive characteristics of a type, period, region, or method of construction, or represents the work of an important creative individual, or possesses high artistic values; or (D) Has yielded, or may be likely to yield, information important in prehistory or history. 3-52 CITY OF ATASCADERO INITIAL STUDY The fact that a resource is not listed in, or determined to be eligible for listing in the California Register of Historical Resources, not included in a local register of historical resources (pursuant to section 5020.1(k) of the Public Resources Code), or identified in a historical resources survey (meeting the criteria in section 5024.1(8) of the Public Resources Code) does not preclude a lead agency from determining that the resource may be a historical resource as defined in Public Resources Code sections 5020.10) or 5024.1. Section 15064.5 of CEQA defines material alteration of a significant resource to include any activity that: Demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its inclusion in, or eligibility for inclusion, in the California Register of Historical Resources; or Demolishes or materially alters in an adverse manner those physical characteristics that account for its inclusion in a local register of historical resources pursuant to section 5020.1(k) of the Public Resources Code or its identification in a historical resources survey meeting the requirements of section 5024.1(8) of the Public Resources Code, unless the public agency reviewing the effects of the project establishes by a preponderance of evidence that the resource is not historically or culturally significant; or, Demolishes or materially alters in an adverse manner those physical characteristics of a historical resource that convey its historical significance and that justify its eligibility for inclusion in the California Register of Historical Resources as determined by a lead agency for purposes of CEQA. Section 7050.5 of the Health and Safety Code, states that in the event human remains are discovered during excavation, work must stop immediately and the County Coroner must be contacted. Section 5097.94 and 5097.98 of the Public Resources Code require consultation with the Native American Heritage Commission, protection of Native American remains, and notification of most likely descendants. SB 447 (Chapter 404, Statutes of 1987) also protects Native American remains or.associated grave goods. Section 15064.5 of the CEQA Guidelines defines significant historic resources to include: A resource listed in or determined to be eligible by the State Historical Resources Commission, for listing in the California Register of Historical Resources (Pub. Res. Code SS5024.1,.Title CCR. Section 4850 et seq.). Mr. Anderson and Mr. Hardy reviewed and evaluated the project's potential impact of the 55 specific work items listed in Section 2.5 based on: • Site visits to observe and record existing conditions of.character-defining features; • Review of existing reports, documents and drawings as specifically relevant to repair and rehabilitation of the historic City Hall structure; 3-53 CITY OF ATASCADERO INITIAL STUDY • Meetings with City staff, the project architect (Ms. Stephanie Kingsworth, AIA, of Pfeiffer Partners) and past president of the Atascadero Historical Society (Mr. Lon Allen) to obtain additional information and clarification regarding • The nature and extent of certain work items; • Simplification of as -built drawings to serve as plan and section drawings for use in this report; • "Zoning" of the historic structure's character -defining features, as defined and illustrated in plans and sections; • Construction of a matrix that summarizes information for each of the 55 project's first phase work items, including location by' zone, reference to Pfeiffer Partners documents, nature and extent of procedure, and impact(s); and, • - A more detailed description and evaluation of potential impact of certain work items. Answers to Checklist Answers Question A: Mr. Anderson and Mr. Hardy's report (Appendix C) concluded that the impacts to historic resources from carrying out the 55 work items that constitute the first phase of the project to repair and rehabilitate the City Hall are: • 24 scope items are unlikely to have any appreciate impact because these items involve actions and procedures that are designed to clean, patch, repair or restore material, finishes or other features of the building's historic fabric; • 13 scope items . are unlikely to have any appreciate impact because these items involve system upgrade and repair actions and procedures that are designed to address deferred maintenance of the building's infrastructure; • 5 scope items are unlikely to have any appreciate impact because these items involve repair actions and procedures that are designed to restore the appearance and/or provide weather protection of original paint coatings; • 5 scope items are likely to have an impact ranging from neutral to positive because these items involve actions and procedures that are designed to either restore original design and character -defining features of the lower and upper rotundas or to .enhance appreciation of the two rotundas; • 2 scope items are likely to have an impact ranging from neutral to positive because these items involve collateral actions and procedures to strengthen bracing of the 3-54 CITY OF ATASCADERO INITIAL STUDY parapet walls, remove non -historic CMU infill in parapet balustrade, and install new terra cotta balusters in parapet; • 1 scope item is likely to have an impact ranging from neutral to positive because this item involves an action and procedure to restore the visual effect of skylight openings above two main staircases; • 1 scope item is likely to have an impact ranging from neutral to positive because this item involves actions and procedures to remove the building's non -historic aluminum entry doors and transoms and replace them with installation of new Hope's steel doors and transoms that are configured and fabricated to match historic sizes and patterns; • 1 scope item is likely to have an impact ranging from non-existent to neutral because the item may involve collateral actions and procedures to install below -grade waterproofing membrane to foundation walls, contingent upon approval to re -level the building in a subsequent phase(s) of the project; and • 1 scope item is likely to have an impact ranging from non-existent to neutral because the item may involve collateral actions and procedures to demolish historic fabric, reconfigure exterior masonry and install new life -safety exit door to match the existing life -safety exit door alteration at opposite corner of the building, with the existing life - safety door to be replaced to match the new life -safety exit door. This scope item is contingent upon program decisions and occupancy loads not yet determined, and in turn, decisions by the fire marshal regarding necessary and appropriate life -safety measures for public assembly and use of City Hall. In summary, the 55 work items of the first. phase of the project to repair and rehabilitate the historically significant City Hall are consist with, and in general conform to, applicable policies and procedures of The Secretary of the Interior's Standards for Rehabilitation and Guidelines for Rehabilitating Historic Buildings. Therefore, and pursuant to Section 15064.5 (b) (3) of Article 5 of CEQA Guidelines, the first phase would result in a level of less than significant impact on the character -defining features and historic integrity of City Hall. Question B: The project is not expected to disturb archaeological resources. Question C: Although no paleontological surveys have been done, the project site has been previously disturbed, and therefore the likelihood of encountering such resources would be minimal. 3-55 Question D: CITY OF ATASCADERO INITIAL STUDY The project is not expected to disturb any known human remains, including those interred outside of a formal cemetery. Finding No mitigation is required and the project would result in less than significant impacts to cultural resources. Initial Study 2006-0038 City Hall Repair and Rehabilitation Project 3.6. GEOLOGY AND SOILS — Would the project: a) Expose people or structures to potential substantial adverse effects, including the risk of loss, injury, or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii) Strong seismic ground shaking? iii) Seismic -related ground failure, including liquefaction? iv) Landslides? b) Result in substantial soil erosion or the loss of topsoil? El® Less Than ❑ ❑ Potentially Significant Less Than No Significant with Significant Impact Impact Mitigation Impact of the Uniform Building Code (1994), creating substantial Incorporation risks to life or property? ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ where sewers are not available for the disposal of El® ❑ ❑ ❑ ® ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ of the Uniform Building Code (1994), creating substantial c) Be located on a geologic unit or soil that.is unstable, or ® ❑ ❑ that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? d) Be located on expansive soil, as defined in Table 18-1-B ❑ ❑ ® ❑ of the Uniform Building Code (1994), creating substantial risks to life or property? e) Have soils incapable of adequately supporting the use of ❑ ❑ ❑ septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of wastewater? SOURCES: Project Description, Planning Staff Site Visit, Land Use Element EIR; West Front Villages IS/MND (City of Atascadero); Soils Engineering Report (Earth Systems Pacific 2004) 3-56 ytt Setting CITY OF ATASCADERO INITIAL STUDY The site lies within the southern part of the Salinas River Valley, east of the Santa Lucia Mountain Range. The Salinas River is approximately a mile and quarter east of the site. The trend of the Salinas River is to the northwest and is predominately controlled by the regional northwest trending Rinconada and San Andreas Fault zones. The Rinconada and San Andreas faults are active northwest trending faults that lie within the general region of the site. These faults are situated east of the site. The Geologic Map of the Santa Margarita area by Hart (1976) indicates that sedimentary rock units, younger alluvium and older alluvium underlie the site. The rock units generally consist of sandstone and shale of the Santa Margarita formation and cherty shale of the Monterey formation. Except for the northern part of the site, the hillsides are capped by older alluvium. The older alluvium was probably deposited thousands of years ago by Paloma Creek when the elevation of the creek was much higher. The northernmost hillside is capped with a thin layer of topsoil overlying shale of the Santa Margarita formation. Younger alluvium lies within the drainage valleys. Faulting The site is situated among four active faults: The Hosgri-San Simeon, the San Andreas, the Los Osos and the Rinconada. Rinconada Fault. The Rinconada Fault is the closest mapped active fault to the site, being approximately 2 miles to the northeast. Vertical displacements across the fault apparently were dominant in the Paleocene and Oligocene; however, the fault has accommodated approximately 11 miles of right -lateral offset from the Miocene to the present (Dibblee, 1976). Dibblee, Jr. has indicated that the youngest unit or formation offset by the fault system is the Pliocene - Pleistocene Paso Robles formation, and that the fault system probably has not offset older alluvium, which is estimated to be 50,000 to 500,000 years old. Major displacement of the Plio- Pleistocene Paso Robles formation, offset. drainages, strong geomorphic expression, and apparent displacements of older alluvium further indicated a late Pleistocene and possible Holocene age for the most recent activity of the Fault (Dibblee, 1976; Hart, 1976). However, the age of the most recent displacement on the Rinconada fault is not known, and further extensive investigation would be required to determine its activity. Although no ground rupture has been mapped in Holocene time on the Rinconada fault, there have been small to moderate earthquakes (<5.9 magnitude) that have been recorded in the vicinity of the fault during the last 200 years, indicating that the fault is active. It is possible that the shock waves produced by these earthquakes did not have enough energy to break the ground surface or cause any ground surface displacement. Los Osos Fault. The Los Fault, located southwest, is considered to be a west -northwest - trending reverse fault on the south side of the Los Osos Valley. The Los Osos fault is divided into four segments. The most westerly segment of the fault is the Estero Bay segment, which lies mostly offshore. The Irish Hills segment starts in the vicinity of Los Osos and extends to just past San Luis Obispo Creek. A two-mile length of this segment west of Laguna Lake is 3-57 CITY OF A TASCADERO INITIAL STUDY considered to be active (Treiman, 1989) and is designated as an Earthquake Fault Zone (Hard, 1997. revised). The other two segments of the Los Osos fault are the Lopez Reservoir segment and the Newsome Ridge segment, located southeast of the Irish Hill segment. The Los Osos fault is capable of generating a maximum moment earthquake of magnitude 6.8; the recurrence interval for an earthquake of this magnitude is approximately 1,925 years (Peterson and et. al., 1996). Hosgri-San Simeon Fault. The Hosgri-San Simeon fault is also an active fault within a relatively close proximity to the site; it is located west of the site. This fault system extends from San Simeon to an ocean shelf 2 miles west of Point Buchon, and then trends toward the Point Sal area. The fault is a northwest trending strike slip fault. It is considered active by the U.S. Geological Survey based on Hall's claims of recent offset terrace deposits along San Simeon Cove and also by a relocation of the 1927 "Lompoc" earthquake onto the southern end of the fault (Hall, 1976, 1977). In addition, PG&E suggested that the Hosgri segment of the fault is active after reviewing seismic reflection survey data (PG&E, 1988). San Andreas Fault. The 1857 fault segment of the active San Andreas fault is located northeast of the site. The last major quake on the 1857 fault segment was the 1857 earthquake that had a magnitude of 7.8. The 1857 fault rupture included the Parkfield, Cholame, Carrizo, and Mojave fault segments. Geotechnical Investigation A Soils Engineering Report for the City Hall Repair and Rehabilitation Project was prepared by Earth Systems Pacific in 2004. The report addressed and analyzed subsurface soil conditions including a general soil profile, a first floor level survey, and a seismic analysis. The general soil profile is that of medium stiff to stiff sandy silt and sandy lean clay. Subsurface water was encountered at depths of 23 to 28 feet. Liquefaction and dynamic settlement analysis is addressed in Questions A -D. The results of the first floor level survey indicate that the western portion of the building has settled approximately seven inches as a result of the earthquake. A number of geotechnical recommendations were identified to protect from further settlement and have been incorporated into Mitigation Measure GEO-1. Answers to Checklist Questions Question A -D: The project is located near the Rinconada fault zone (Seismic Zone 4). The Rinconada fault is a "type Bn fault, which refers to a 6.5 to 7.0 magnitude earthquake and a slip rate between 2 to 5 mm/year. Other active faults in the area, primarily the San Andreas Fault, may result in significant seismic events during the life of the proposed structure. The property contains no unusual geological formations. Although the City Hall building was significantly damaged during the earthquake, no incidence of surface liquefaction was recorded at the site. However, using the analytical method by Youd and_ Idriss (2001), Earth Systems Pacific, the geotechnical consultant for the project, .concluded that liquefaction could occur from the groundwater level to a depth of about 50 feet and potentially create four to six inches of dynamic settlement. A 3-58 CITY OFATASCADERO INITIAL STUDY variety of detailed recommendations pertaining to this geologic hazard and other seismic analysis are included as Appendix C. As the topography of the site is level, landsliding is not considered a significant geologic hazard. Expansive soils were noted as being a significant hazard by the geotechnical report. Question E: The project will not require a septic system. Mitigation Mitigation Measure GEO-1. The City shall implement the preliminary geotechnical recommendations contained in the Soils Engineering Report (Appendix C) and/or measures identified through subsequent engineering design to minimize impacts to geology and soils. Finding With incorporation of mitigation, impacts would be less than significant. Less Than Potentially Significant Less Than No Initial Study 2006-0038 Significant Impact with Mitigation Significant Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.7. Hazards and Hazardous. Materials— Would the project: a) Create a significant hazard to the public or the through ® ❑ ❑ environment the routine transport, use or disposal of hazardous materials? b) Create a significant hazard to the public or the through ® ❑ ❑ environment reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? c) Emit hazardous emissions or handle hazardous or acutely hazardous ® ❑ ❑ material, substances, or waste within one-quarter mile of an existing or proposed school? d) Be located on a site which is included on a list of hazardous ❑ ❑ materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or environment? e) For a project located within in an airport land use plan El ❑ area or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard for people living or working in the project area? f) For a project located within the vicinity of a private airstrip, ❑ Elwould the project result in a safety hazard for people living or working in the project area? 3-59 CITY OF ATASCADERO INITIAL STUDY g) Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan? h) Expose people or structures to a significant risk of loss, injury or death involving wildland fires, including where wildlands are adjacent to urbanized areas or where residences are intermixed with wildlands? SOURCES: Project description, General Plan Land Use Element; Site Visit Environmental Setting Atascadero Junior High School is located directly adjacent to the project site to the north, on the north side of Lewis Avenue. Answers to Checklist Questions Question A -B: During implementation of specific items of work delineated as part of the proposed project, minor amounts of hazardous materials such as fuels, oils, and solvents may be used. Releases of these materials could potentially occur, but would be small in scale and quickly cleaned up. No significant disturbance of soils would occur. Due to the age of the City Hall, there is a strong possibility that materials slated for removal and replacement contain asbestos and lead which could potentially become airborne; therefore, mitigation measures addressing the sampling and safe removal and disposal of these materials would be implemented (see Mitigation Measures AQ -1 and AQ -2). The APCD indicates that buildings built before 1984 may contain asbestos -containing building materials; therefore, the health and safety of workers and nearby residents must be addressed. The mitigation measures referenced above contain hazardous material release prevention and remediation objectives that shall be implemented as part of the proposed project. Question C: The project site is located adjacent to an existing school (Atascadero Junior High School). Hazardous emissions or acutely hazardous materials or wastes would potentially be encountered in the project (asbestos and lead); however, the potential for emissions or releases would be mitigated by Mitigation Measure AQ -1 and AQ -2. Use of hazardous materials or disposal of hazardous wastes would be limited to short-term construction activity only. Operation of the City Hall upon project completion would not create any risks associated with hazards or hazardous materials. Question D: The project is not listed on the State Hazardous Waste and Substance Site list. 3-60 Question E -F: The property is not near an airport. Question G -H: The site is within the Fire Department's seven -minute response area. Mitigation CITY OF ATASCADERO INITIAL STUDY Mitigation Measure HAZ-1: Implement Mitigation Measures AQ -1 and AQ -2. Finding With the incorporation of mitigation, the proposed project would result in less than significant impacts to hazards and hazardous materials. Less Than Potentially Significant Less Than Significant with Significant No Initial Study 2006-0038 Impact Mitigation Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.8. HYDROLOGY AND WATER QUALITY — Would the project: a) Violate any water quality standards or waste discharge requirements? ❑ ® ❑ b) Substantially deplete groundwater supplies or interfere substantially with groundwater recharge such that there ❑ ® ❑ would be a net deficit in aquifer volume or a lowering of the local groundwater table level (e.g., the production rate of previously -existing nearby wells would drop to a level that would not support existing land uses or planned uses for which permits have been granted)? c) Substantially alter the existing drainage pattern of the site or area, including through the ❑ ® ❑ alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on- or off-site? d) Substantially alter the existing drainage pattern of the site or area, including through the ❑ ® ❑ alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner that would result in flooding on- or off-site? e) Create or contribute runoff water which would exceed the capacity of existing or planned storniwater drainage systems ❑ ® ❑ .or provide substantial additional sources of polluted runoff? f) Otherwise substantially degrade water quality? ❑ ® El g) Place housing within a 100 -year flood hazard area as 3-61 CITY OF ATASCADERO INITIAL STUDY SOURCES: Project description, Flood Insurance Rate Map 060700 0003 B (1/20/82); Site Visit. Setting Natural drainage courses within the City include Atascadero, Graves and Paloma Creeks, and the Salinas River. Water quality in the creeks and groundwater basin is affected by surface drainage and pollution. Construction in the areas that directly or indirectly drain to waterways results in disturbance of surface soils, which can be washed into area waterways. This can adversely affect turbidity, temperature, oxygen levels, and other. important water quality indicators. Increased development also increases the amount of impermeable surfaces, potentially increasing runoff and decreasing groundwater recharge. Atascadero Creek is in close proximity to the project site, approximately 200 feet away. No drainages or waterways exist on the project site. Groundwater. Currently the City derives all of its domestic water from groundwater resources. Supply. All properties within the City are entitled to water from the Atascadero Mutual Water Company (AMWC). AMWC obtains groundwater from a combination of shallow and deep wells that tap into the Paso Robles Formation, which extends from Atascadero northward to the county line and eastward toward Shandon. Drainage/Flooding Problems. Portions of the City and outlying areas are within the 100 -year flood hazard, as defined by local Flood Insurance Rate Maps. The flood hazard area associated with the Salinas River extends to the east side of Hidalgo Avenue, Sycamore Road, and Capistrano Avenue, as well as a segment of Curbaril Avenue. The flood hazard area associated with Atascadero Creek is generally limited to its channel and immediately adjacent properties, except where the creek crosses Highway 101. Flooding along Paloma and Graves Creek is generally contained to areas within and immediately adjacent to the channels. 3-62 Less Than Potentially Significant Less Than No Initial Study 2006-0038 Significant Impact , with Mitigation Significant Impact Impact City Hall Repair and Rehabilitation Project Incorporation mapped on a federal Flood Hazard Boundary or Flood El ❑ Insurance Rate Map or other flood hazard delineation map? h) Place within a 100 -year flood hazard area structures that would impede or redirect flood flows? i) Expose people or structures to a significant risk of loss, injury or death involving flooding, including flooding as a result of the failure of a levee or dam? j) Inundation by seiche, tsunami, or mudflow? SOURCES: Project description, Flood Insurance Rate Map 060700 0003 B (1/20/82); Site Visit. Setting Natural drainage courses within the City include Atascadero, Graves and Paloma Creeks, and the Salinas River. Water quality in the creeks and groundwater basin is affected by surface drainage and pollution. Construction in the areas that directly or indirectly drain to waterways results in disturbance of surface soils, which can be washed into area waterways. This can adversely affect turbidity, temperature, oxygen levels, and other. important water quality indicators. Increased development also increases the amount of impermeable surfaces, potentially increasing runoff and decreasing groundwater recharge. Atascadero Creek is in close proximity to the project site, approximately 200 feet away. No drainages or waterways exist on the project site. Groundwater. Currently the City derives all of its domestic water from groundwater resources. Supply. All properties within the City are entitled to water from the Atascadero Mutual Water Company (AMWC). AMWC obtains groundwater from a combination of shallow and deep wells that tap into the Paso Robles Formation, which extends from Atascadero northward to the county line and eastward toward Shandon. Drainage/Flooding Problems. Portions of the City and outlying areas are within the 100 -year flood hazard, as defined by local Flood Insurance Rate Maps. The flood hazard area associated with the Salinas River extends to the east side of Hidalgo Avenue, Sycamore Road, and Capistrano Avenue, as well as a segment of Curbaril Avenue. The flood hazard area associated with Atascadero Creek is generally limited to its channel and immediately adjacent properties, except where the creek crosses Highway 101. Flooding along Paloma and Graves Creek is generally contained to areas within and immediately adjacent to the channels. 3-62 Answers to Checklist Questions: Question A: CITY OF ATASCADERO INITIAL STUDY Implementation of the proposed repair and rehabilitation project would not significantly affect water quality standards or waste discharge requirements. The proposed project would be implemented in an urban area and would not result in any substantial changes to existing drainage patterns or measurable changes in the rate and amount of surface runoff. Furthermore, no substantial amounts of exposed soils or other hazardous construction materials or wastes would be used during construction activity. Operation of the repaired City Hall, would return the pre -project conditions and would not result in violations of water quality standards or waste discharge requirements. Consequently, water quality impacts are considered to be less than significant. Questions B and F: Neither construction activities nor City Hall operational activities would substantially deplete water supplies or affect nearby wells. Groundwater quantity and quality impacts are considered to be less than significant. Questions C, D, and E: The proposed project would not substantially alter existing drainage patterns on the site or the surrounding area and would. continue to use the stormwater drainage system developed for the surrounding streets. Consequently, the project would not significantly change absorption rates, drainage patterns, or the rate and amount of surface runoff during project construction or operations. Questions G -J: The project would not place housing within a 100 -year flood hazard area. No new structures would be built that would impede or redirect flood flows. The project would not expose persons to flooding risks. Consequently, flooding impacts are considered to be less than significant. The project site is not subject to inundation by a seiche, tsunami, or mudflow. Finding The proposed project would have a less than significant impact on hydrology/water quality; therefore, no mitigation is required. 3-63 CITY OF ATASCADERO INITIAL STUDY Less Than Potentially Significant Less Than No Significant with Significant Impact Initial Study 2006-0038 Impact Mitigation Impact City Hall Repair and Rehabilitation Project Incorporation 3.9. LAND USE AND PLANNING - Would the project: a) Physically divide an established community? 0 b) Conflict with any applicable land use plan, policy, or regulation of an agency with jurisdiction over the project (including, but not limited to the general plan, specific plan, local coastal program, or zoning ordinance) adopted for the purpose of avoiding or mitigating an environmental effect? c) Conflict with any applicable habitat conservation plan or ❑ El Elnatural community conservation plan? SOURCES: Land Use Element, Circulation Element, Project Description, Setting U.S. Highway 101 provides the primary access to the City from points north and south. Highway 41 provides access east and west to the foothills and the coast, respectively. According to the 2000 U.S. census data, the current population is 26,411, making it the second most populous city in the County. The population is concentrated within the urban areas; outlying areas are more sparsely populated. According to the City's General Plan, this site is currently designated Downtown (D). The site is zoned Downtown Commercial (DC). Answers to Checklist Questions Question A: Implementation of the proposed project will not physically divide an established community. The civic land use in the proposed location is consistent and compatible with adjacent commercial and residential land uses. Question B: Because the project involves restoration of the existing City Hall, there would be no conflicts with applicable land use plans, policies, or ordinances. No major modifications to the building would be made that would create inconsistencies, pertaining to size or character, with applicable rules and regulations contained in the City's General Plan and Zoning Code. Question C: The project will not conflict with any habitat conservation plan or natural community conservation plan.. 3-64 CITY OF ATASCADERO INITIAL STUDY Finding The proposed project would not result in impacts to land use. Less Than Potentially Significant Less Than No Significant with Significant Initial Study 2006-0038 Impact Mitigation Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.10. MINERAL RESOURCES — Would the project: a) Result in the loss of availability of a known mineral. resource that would be of value to the region and the residents of the state? b) Result in.the loss of availability of a locally -important ❑ mineral resource recovery site delineated on a local general plan, specific plan or other land use plan? SOURCES: Project Description; site visit. Setting The project site is not located in an area of mineral resource development. Answers to Checklist Questions: Questions A and B: No mining is proposed as a part of this project. No known mineral resources have been identified in the area; therefore, there will be no impacts to mineral resources. Finding There would be no impacts to mineral resources. MR Less Than Potentially. Significant Less Than No Initial Study 2006-0038 Significant Impact with Mitigation Significant Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.11. NOISE — Would the project result in: a) Exposure of persons to or generation of noise levels in _ EJ V\J excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b) Exposure of persons to or generation of excessive El ❑ ®. ground -borne vibration or ground -borne noise levels? c) A substantial permanent increase in ambient noise levels 1 ❑ ®. in the project vicinity above levels existing without the MR V CITY OF ATASCADERO INITIAL STUDY project? Definitions . Decibel, DB A unit describing the amplitude of sound, equal to 20 times the logarithm to d) A substantial temporary or periodic increase in ambient the base 10 of the ratio of the sample sound pressure to the standard sound pressure, which is 20 micropascals (20 micronewtons per square meter) noise levels in the project vicinity above levels existing The number of complete pressure fluctuations per second above and below atmospheric pressure without the project? The sound pressure level in decibels as measured on a sound level meter dB using the A -weighting filter network. The A -weighting filter de-emphasizes e) For a project located within an airport land use plan or, the very low and very high frequency components of the sound in a manner similar to the frequency response of the human ear, and correlates well with where such a plan has not been adopted, within two miles of subjective reactions to noise. All sound levels in this reports are A -weighted Equivalent Noise Level, Leq The average A -weighted noise level during the measurement period a public airport or public use airport, would the project The average A -weighted` -noise level during a 24-hour day, obtained after Equivalent Level, CNEL addition of 5 decibels in the evening from 7:00 P.M. to 10:00 P.M. and after expose people residing or working in the project area to addition of 10 decibels to sound levels in the night between 10:00 P.M. and 7:00 A.M. excessive noise levels? The average A -weighted noise level during a 24-hour day, obtained after addition of 10 decibels to levels measured in the night behveen 10:00 P.M. f) For a project within the vicinity of a private airstrip, would and 7:00 A.M. Ambient Noise Level The composite of noise from all sources near and far. The normal or existing the project expose people living or working in the project area to excessive noise levels? SOURCES: Project description, Noise Element, Noise Ordinance Setting General Information on Noise. Noise is generally defined as unwanted or objectionable sound. Decibels and other technical terms are defined in Table 3.11-1. Noise levels are measured on a logarithmic scale because of physical characteristics of sound transmission and reception. Noise energy is typically reported in units of decibels (dB). Noise levels diminish (or attenuate) as distance to the source increases according to the inverse square rule, but the rate constant varies with type of sound source. Sound attenuation from point sources, such as industrial facilities, is about 6 dB per doubling of distance. Heavily traveled roads with few gaps in traffic behave as continuous line sources and attenuate at 3 dB per doubling of distance. Noise from more lightly traveled roads is attenuated at 4.5 dB per doubling of distance. Table 3.11-1 Definitions of Acoustical Terms Term Definitions . Decibel, DB A unit describing the amplitude of sound, equal to 20 times the logarithm to the base 10 of the ratio of the sample sound pressure to the standard sound pressure, which is 20 micropascals (20 micronewtons per square meter) Frequency, Hz The number of complete pressure fluctuations per second above and below atmospheric pressure A -Weighted Sound Level, The sound pressure level in decibels as measured on a sound level meter dB using the A -weighting filter network. The A -weighting filter de-emphasizes the very low and very high frequency components of the sound in a manner similar to the frequency response of the human ear, and correlates well with subjective reactions to noise. All sound levels in this reports are A -weighted Equivalent Noise Level, Leq The average A -weighted noise level during the measurement period Community Noise The average A -weighted` -noise level during a 24-hour day, obtained after Equivalent Level, CNEL addition of 5 decibels in the evening from 7:00 P.M. to 10:00 P.M. and after addition of 10 decibels to sound levels in the night between 10:00 P.M. and 7:00 A.M. Day/Night Noise Level, Ldn The average A -weighted noise level during a 24-hour day, obtained after addition of 10 decibels to levels measured in the night behveen 10:00 P.M. and 7:00 A.M. Ambient Noise Level The composite of noise from all sources near and far. The normal or existing 3-66 i'aavti� CITY OF ATASCADERO INITIAL STUDY level of environmental noise at a given location Intrusive That noise which intrudes over and above the existing ambient noise at a given location. The relative intrusiveness of a sound depends upon its amplitude, duration, frequency, time of occurrence, tonal or information content, as well as the prevailing ambient noise level Community noise levels are measured in terms of the A -weighted decibel (dBA). A -weighting is a frequency correction that correlates overall sound pressure levels with the frequency response of the human ear. Equivalent noise level (LeQ) is the average noise level on an energy basis for a specific time period. The duration of noise and the time of day at which it occurs are important factors in determining the impact on communities. Noise is more disturbing at night and noise indices have been developed to account for the time of day and duration of noise generation. The Community Noise Equivalent (CNEL) and Day Night Average Level (DNL or Ldp) are such indices. These indices are time -weighted average values equal to the amount of acoustic energy equivalent to a time -varying sound over a 24-hour period. The CNEL index penalizes night-time noise (10 p.m. to 7 a.m.) by adding 5 dB to account for increased sensitivity of the community after dark. The Ldp index penalizes night-time noise the same as the CNEL index, but does not penalize evening noise. Effects of Noise. People are subject to a multitude of sounds in the environment. Excessive noise cannot only be undesirable but may also cause physical and/or psychological damage. The amount of annoyance or damage caused by noise is dependent primarily upon three factors: the amount and nature of the noise, the amount of ambient noise present before the intruding noise, and the activity of the person working or living in the noise source area. The difficulty in relating noise exposure to public health and welfare is one of the major obstacles in determining appropriate maximum noise levels. Although there has been some dispute in the scientific community regarding the detrimental effects of noise, a number of general conclusions have been reached: Noise of sufficient intensity can cause irreversible hearing damage; • Noise can produce physiological changes in humans and animals; • Noise can interfere with speech and other communication; and, • Noise can be a major source of annoyance by disturbing sleep, rest, and relaxation. Existing Noise Environment All streets surrounding the project site are two-lane with slow traffic speeds. With the exception of some occasional commercial light -truck traffic, no significant mobile noise sources are present in the vicinity. Sensitive noise -receptors exist on all sides of the project site. They include some residences, small commercial_ businesses, Sunken Gardens, and Atascadero Junior High School. 3-67 CITY OF ATASCADERO INITIAL STUDY The California Department of Transportation (Caltrans) Technical Noise Supplement provides some general guidelines for determining community noise impacts: • A three -dB change is barely perceptible and is the minimum most people will notice in most environments; • A five -dB change is a readily perceptible increase per decrease in sound level; and, • A ten -dB increase in sound level is perceived as an approximate doubling of the loudness of the sound and represents a substantial change in loudness. Answers to Checklist Questions Questions A -C: The primary source of noise affecting noise -sensitive receptors in the project vicinity would be from construction activity. These impacts would be temporary in nature and limited to daytime hours. Once repair activities have been completed, the noise environment would return to existing levels. As such, impacts to noise levels in the project vicinity would be less than significant. Question D: Construction of the proposed project could result in short-term noise impacts to nearby residences, persons at Sunken Gardens, and students at Atascadero Junior High School. Questions E -F: The project is not located within an airport land use plan or private airstrip. Mitigation Mitigation Measure NOI-1: All construction activities shall comply with the City of Atascadero Noise Ordinance for hours of operation. The hours of construction may be modified by the Community Development Director upon a determination that unusually loud construction activities are having a significant impact on the neighbors, such as the Atascadero Junior High School. Finding With the incorporation of mitigation, the proposed project would result in less than significant impacts to noise. 3-68 CITY OF ATASCADERO INITIAL STUDY Less Than Potentially Significant Less Than No Significant with Significant Initial Study 2006-0038 Impact Mitigation Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.12. POPULATION AND HOUSING — Would the project: a) Induce substantial population growth in an area, eitherE]❑ directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? b) Displace substantial numbers of existing housing, ❑ Elnecessitating the construction of replacement housing elsewhere? c) Displace substantial numbers of people, necessitating the ❑ Elconstruction of replacement housing elsewhere? SOURCES: Project description, General Plan Land Use Element. Setting The population of Atascadero grew 14.1% during the 1990s, with the majority of that increase occurring in the second half of the decade. The City is expected to continue to grow at roughly the same rate until at least 2010. Answers to Checklist Questions Questions A -C: The land use of the site is designated Downtown (D) according to the City's General Plan. The project would not result in the construction of new homes or businesses, nor does it propose to add additional infrastructure to the City. No displacement of existing housing or residents would occur with implementation of the project. Finding The proposed project would not result in impacts to Population/Housing; therefore, no mitigation is required. 3-69 CITY OF ATASCADERO INITIAL STUDY Less Than Potentially Significant Less Than No Significant with Significant Impact Initial Study 2006-0038 Impact Mitigation Impact City Hall Repair and Rehabilitation Project Incorporation 3.13. PUBLIC SERVICES a) Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times or other performance objectives for any of the public services: Fire protection? El ❑ ❑ Police protection? Schools? El F71 Parks? IK Other public facilities? SOURCES: Project description, Land Use Element EIR. Setting The City provides police protection, fire protection, and numerous other general government functions. Schools are operated by the Atascadero Unified School District. Fire Protection The City of Atascadero Fire Department operates two fire stations located at 6005 Lewis Avenue and 9801 West Front Road. The fire department staffs 17 full-time and 24 reserve staff, who provide structural and wildland fire protection, emergency medical service and fire prevention to the public. The fire department currently has a reflex (or response) time of six minutes over 60% of the City, and eight minutes over 82% of the City. The fire department's goal is to have a six - minute reflex time over 90% of the City, and an eight -minute reflex time over 95% of the City for fire response and emergency medical care. The City has automatic aid agreements with the California Department of Forestry and Fire Protection (CDF)/County of San Luis Obispo . Fire Department. They also have Mutual Aid Agreements with all fire departments in the County through the San Luis Obispo County Fire Services Mutual Aid Plan. Police Protection The Police Station is located at the corner of EI Camino Real and Rosario Avenue. Currently, the City employs approximately 30 sworn officers or about 1.2 officers per 1,000 people. 'The 3-70 CITY OFATASCADERO INITIAL STUDY Police Chief has indicated that 1.4 officers per 1,000 people are preferred. In addition to sworn officers, a number of support staff including clerks and dispatchers is needed for the efficient operation of the department. These staff are collectively known as support services technicians (SST). Currently, the Police Department employs about eight SST and one support services supervisor. Schools Public schools are governed by the Atascadero Unified School District, which covers a large area from the City eastward to the County line. The district has five elementary schools, one junior high school, one comprehensive high school, four alternative or academy schools and one continuation school. The junior and senior high schools also serve the unincorporated communities of Santa Margarita, Creston, and the Carrisa Plains. The Atascadero Fine Arts Academy, the Santa Rosa Academic Academy, and the West Mall Alternative school serve students interested in fine arts, accelerated learning, and home schooling, respectively. Answers to Checklist Questions: Question A: Proposition 40 funds (see Section 2.0) would be used to help fund the project in part for the purposes of public safety improvements at a public facility. The project would not result in additional population; therefore no school fees to fund the Atascadero Unified School District would be issued. The project would not increase the demand for other public services, including fire protection, police protection, libraries, and parks. Finding The proposed project would result in no impacts to public services and no mitigation is required. Less Than Potentially Significant Less Than No Significant with Significant Initial Study 2006-0038 Impact Mitigation Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.14. RECREATION — a) Would the project increase the use of existing ® 1:1neighborhood and regional parks or other recreational El facilities such that substantial physical deterioration of the facility would occur or be accelerated? b) Does the project include recreational facilities or require ❑ the construction. or expansion of recreational facilities that EJ might have an adverse physical effect on the environment? SOURCES: Project description, Parks and Recreation Element. 3-71 CITY OF ATASCADERO INITIAL STUDY This section addresses the existing parks and recreation conditions of the project area. This section also addresses the impacts from the proposed project. Impacts to parks and recreation associated with the project were based on a review of existing literature and the proposed project. Environmental Setting The City of Atascadero currently has over 95 acres of parks available for public use. With a population of approximately 26,400, there are 3.6 acres of parks for every 1,000 individuals. This includes the Atascadero Lake Park, the Atascadero Zoo, Heilmann Park, George C. Beatie Skate Park, Paloma Creek Park, Sunken Gardens, and Traffic Way Park. These facilities offer a wide variety of activities from hiking trails and tennis courts, to fishing, swimming, and boating. Sunken Gardens is an existing public recreational facility located adjacent to the project site. Answers to Checklist Questions: Question A: The nature of the proposed project does not directly lend itself to increased use of the nearby Sunken Gardens. Construction activities at the City Hall may temporarily degrade the use and enjoyment of the Park related primarily to noise intrusion; however, these impacts would be short-term in nature. There would be no long -terms effects on the Park resulting from the project. Question B: The proposed project does not include new recreational facilities, or require the construction or expansion or recreational facilities that might have an adverse physical effect on the environment. Finding The proposed project will results in only temporary impacts to recreation, which would be less than significant; no mitigation is required. 3-72 _ _t - CITY OF ATASCADERO INITIAL STUDY Less Than Potentially Significant Less Than No Significant with Significant Initial Study 2006-0038 Impact Mitigation Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.15. TRANSPORTATION/TRAFFIC — Would the project: a) Cause an increase in traffic that is substantial in relation ® El El the existing traffic load and capacity of the street system (i.e., result in a substantial increase in either the number of vehicle trips, the volume to capacity ratio on roads, or congestion at intersections)? b) Exceed, either individually or cumulatively, a level of ® ❑ ❑ service standard established by the county congestion management agency for designated roads or highways? c) Result in a change in air traffic pattems, including either ❑ ❑ an increase in traffic levels or a change in location that results in substantial safety risks? d) Substantially increase hazards due to a design feature ❑ (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? e) Result in inadequate emergency access? E ❑ ❑ f) Result in inadequate parking capacity? ❑ ❑ g) Conflict with adopted policies, plans, or programs E]supporting alternative transportation (e.g., bus turnouts, bicycle racks)? SOURCES: Land Use Element, Circulation Element Environmental Setting Laid out as part of the 1913 Atascadero Colony plan, the circulation system was designed for low -intensity uses. The existing network consists of radial routes emanating from the City Hall area supported by a series of arterial rings meant to convey traffic to outlying areas. A few blocks in the city center display the grid system common to most cities. Not all planned streets have been built, and many minor streets are privately maintained and are not part of the City's adopted system. The radial street pattern was interrupted in 1954 with construction of Highway 101. Commercial development has since spread along EI Camino Real. The freeway has limited east -west travel to the eight crossings and does not allow for access from Atascadero Mall to EI Camino Real and the downtown area. The Circulation Element classifies roadways based on their intended function and projected traffic levels, which determines the appropriate type of design and. number of lanes for the route. Table 3.15-1 describes the different types of roads: 3-73 Table 3.15-1 Roadway Classifications CITY OF ATASCADERO INITIAL STUDY Type Description Freeway High speed; high capacity limited access facilities serving intercity and regional travel. Example: US 101 Arterials Provide for circulation between major activity centers and residential areas in the City and beyond; provide access to freeways Major arterials are high-capacity, moderately high-speed routes, typically two or four lanes wide Minor arterials interconnect with and augment the major arterial system, and serve trips of moderate length Collectors Channel traffic from residential or commercial areas to arterials. Further classified as urban, rural, or hillside, depending upon the area and type of topography and vegetation Local Streets Provide access to adjoining land uses Existing Roadway System Roadways that provide primary circulation in the vicinity of the project site include Traffic Way, EI Camino Real, U.S. 101, and West/East Mall Road. Traffic Way is a 2 -lane collector running east—west and serves the downtown area while connecting eastern portions of the City to U.S. 101 and EI Camino Real. EI Camino Real constitutes the principal north -south arterial that serves the downtown and residences to the north and south of the downtown area. EI Camino Real is primarily a four -lane major arterial (from San Rafael Road to San Anselmo Road) that is east of and adjacent to U.S. 101. Many of Atascadero's commercial and retail land uses are found along this corridor. U.S. 101 is a major freeway facility that serves regional and inter -regional north -south travel within and throughout the City of Atascadero. U.S. 101 is a four -lane divided freeway through the City. According to Caltrans Traffic Volumes on the State Highway System (2002), U.S. 101 carries an average daily traffic (ADT) volume of approximately 40,500 vehicles within the vicinity of the project. West/East Mall Road, Lewis Avenue, and Palma Avenue are local streets which serve the downtown grid and surround each side of the City Hall site. Answers to Checklist Questions Questions A -B: The street system around the project site is lightly traveled and generally free of congestion, except for mornings and afternoons when students are dropped off and picked up from the adjacent school. During the construction period, construction trips would occur generally in the 3-74 CI TY OF ATASCADERO INITIAL STUDY morning and end of the day as workers arrive to and leave the site. Other construction trips would involve heavy duty trucks or trailer rigs dropping off building and other project materials. Construction traffic may potentially interfere with school traffic peak hours (student drop-offs, pick-ups and buses). To alleviate potential conflicts between vehicles and buses with students arriving and departing the nearby Atascadero Junior High School and construction vehicles, a traffic control plan would be implemented. This plan would be review and coordinated with the school (see Mitigation TRA -1). Once project construction is completed, traffic levels would return to pre -project conditions. Question C: No changes will occur to the air traffic patterns. Question D: The project will not substantially increase hazards due to a design feature or incompatible use. Question E: The project site will have adequate emergency access from the existing street network, West and East Mall Road, Lewis Avenue and Palma Avenue. Question F: Existing on and off-street parking in the vicinity of City Hall would be utilized upon project completion. Construction vehicles would be parked at a staging area along Palma Avenue (see Mitigation Measure TRA -1). Additional equipment may be staged on the lawn areas surrounding the building. Following construction, landscaping would be conducted. Question G: The project does not conflict with adopted policies, plans, or programs supporting alternative transportation. Mitigation Mitigation Measures TRA -1: Traffic Control Plan. The City, in coordination with the Atascadero Unified School District, shall develop and implement a traffic control plan to reduce construction - related effects on the local street system. Construction vehicles, worker commute vehicles, and equipment shall be staged on the section of Palma Avenue between East and West Mall Road in front of the entrance to City Hall and Sunken Gardens. This section of street shall be closed to the public during periods of project construction. City guidelines for temporary road closures shall be followed, including notification of nearby businesses of this closure. The Traffic Control Plan shall ensure that access to these businesses is not substantially affected. 3-75 Finding CITY OF ATASCADERO INITIAL STUDY With the incorporation of mitigation, the proposed project will result in less than significant impacts to transportation/circulation. Water Currently the City derives all of its domestic water from groundwater resources. All properties within the City are entitled to water from the Atascadero Mutual Water Company (AMWC). AMWC obtains groundwater from a combination of shallow and deep wells that tap into the Paso Robles Formation_, which extends from Atascadero northward to the county line and eastward toward Shandon. 3-76 Less Than Initial Study 2006-0038 Potentially Significant Significant with Less Than Significant No Impact City Hall Repair and Rehabilitation Project Impact Mitigation Incorporation Impact 3.16. UTILITIES AND SERVICE SYSTEMS —Would the project: a) Exceed wastewater treatment requirements of the applicable Regional Water ❑ Quality Control Board? b) Require or result in the construction of new water or treatment facilities Elwastewater or expansion of existing facilities, the construction of which could cause significant environmental effects? c) Require or result in the construction of new storm water facilities El ❑ Eldrainage or expansion of existing facilities, the construction of which could cause significant environmental effects? d) Have sufficient water supplies available to serve the project from existing entitlements and resources, or are new ❑ ❑ . or expanded entitlements needed? e) Result in a determination by the wastewater treatment that ❑ ❑ provider serves or may serve the project that it has adequate capacity to serve the project's projected demand in addition to the provider's existing commitments? f) Be served by a landfill with sufficient permitted capacity to accommodate the ® ❑ project's solid waste disposal needs? g) Comply with federal, state, and local statutes andEl® ❑ regulations related to solid waste? SOURCES: Project description, Land Use Element (LUE) EIR; Project Plans. Setting Water Currently the City derives all of its domestic water from groundwater resources. All properties within the City are entitled to water from the Atascadero Mutual Water Company (AMWC). AMWC obtains groundwater from a combination of shallow and deep wells that tap into the Paso Robles Formation_, which extends from Atascadero northward to the county line and eastward toward Shandon. 3-76 Sewage Treatment CITY OF ATASCADERO INITIAL STUDY The City collects, treats, and disposes of sewage from development within the Urban Services Line. In 2000, the City provided sewage service to 4,3223 connections. The treatment plant has an average capacity of about 2.39 million gallons per day (mgd) in dry weather and 4.3 mgd in wet weather. Currently, the average dry weather flow is about 1.2 mgd (50% capacity). The year average is 3.1 mgd, including wet weather flows. Over the past thirteen years, flows to the plant have increased by approximately 0.02 mgd/yr. At this rate, it would take approximately 54 years for the plant to reach capacity. Solid Waste Disposal A private vendor, Wil -Mar Disposal, collects solid waste under a franchise agreement with the City. Participation in garbage collection is mandatory citywide and rates are based on volume as part of a comprehensive effort to comply with current state law for waste reduction. The Chicago Grade landfill serving Atascadero is also used by the unincorporated communities of Santa Margarita and Templeton, and has an expected remaining life of about 16 years (Source: Chicago Grade Landfill, Site Life Calculation, December 20, 2001). Additional landfill capacity would be required to extend beyond the current permitted disposal area. Answers to Checklist Questions Questions A -B, E: The project will not require the construction of new wastewater treatment facilities or the expansion of existing ones, nor would it cause the exceedance of treatment requirements of the applicable Regional Water Quality Control Board. Sewer discharge will be handled by a City sewer connection upon re -opening of the City Hall. Question C: The project will not require the construction of new storm drainage facilities. Question D: The Atascadero Mutual Water Company (AMWC) will provide water to the project upon completion. All, property within the City limits is entitled to water from the AMWC. The project is not expected to require significant quantities of water for the proposed uses. Questions F -G: Solid waste from construction activities, including removal of existing materials, such as masonry, brick and mortar from the damaged City Hall, would be disposed of at the local Chicago Grade Landfill. Other wastes would include miscellaneous construction materials left over after repairs. Disposal of solid waste would be in compliance with federal, state, and local statutes and regulations. 3-77 Mitigation No mitigation measures are necessary. Finding CITY OF ATASCADERO INITIAL STUDY The project would result in less than significant impacts to public services and utilities. Less Than Potentially Significant Less Than No Significant with Significant Initial Study 2006-0038 Impact Mitigation Impact Impact City Hall Repair and Rehabilitation Project Incorporation 3.17. MANDATORY FINDINGS OF SIGNIFICANCE — a) Does the project have the potential to degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? b) Does the project have impacts that are individually ❑ ® ❑ limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)? c) Does the project have environmental effects that will El cause substantial adverse effects on human beings, either directly or indirectly? Discussion The project consists of a series of actions for the repair, maintenance, and rehabilitation of Atascadero's City Hall. The project would occur in three phases. Funding for each phase of the, project is derived from separate sources. Funding for the first phase of the project would come from a State grant. The first phase of the project addresses specific items as delineated by a team of architectural and engineering consultants retained by the City of Atascadero. The items fall within seven major categories of work, as follows: • Exterior cladding; • Roofing, waterproofing, and skylights; • Interior partitions, doors, and glazing; • Floor and roof structure repairs • Heating, ventilation, and air conditioning repairs; and, 3-78 • Electrical lighting, power, and communication repairs. Answers to Checklist Questions Questions A -C: CITY OF ATASCADERO INITIAL STUDY The project has potential to degrade the quality of the environment and have environmental effects that would cause substantial adverse effects on human beings; however, mitigation measures have been proposed to minimize impacts to a level of less than significant. Finding With the incorporation of mitigation, the project would result in less than significant impacts. Sources • California Air Resources Board website. Proposed 2006 State Area Designations Map for PM10. http://www.arb.ca.gov/desig/adm/adm.htm. • California Cultural and Historical Endowment (California State Library) website. Accessed October, 2006. www.library.ca.gov/CCHE/index.cfm#contact • CEQA Handbook, Air Quality Control District, August 1995. • Dibblee, J.W., Jr. 1976.. The Rinconada Fault and related faults in southern Coast Ranges, California and their tectonic significance. U.S. Geologic Survey Professional Paper 981. • Earthquake Engineering Research Institute. 2004. Special Earthquake Report — March 2004. Preliminary Observations on the December 22, 2003 San Simeon Earthquake. • General Plan Safety Element. 2002. City of Atascadero. • General Plan Circulation Element. 2002. City of Atascadero. • General Plan Land Use Element, Land Use Map. 2002. City of Atascadero. • General Plan Noise Element. 2002. City of Atascadero. • Guide for Developers. 1998 (draft). Atascadero Fire Department. • Hall, C.A. Jr. 1976. Geologic map of the San Simeon -Piedras Blancas region, San. Luis Obispo County, California: U.S. Geologic Survey Map MF -784. scale: 1:24,000. 3-79 CITY OF ATASCADERO INITIAL STUDY • Hart, E.W. 1976. Basic Geology of the Santa Margarita, San Luis Obispo County, California. • Crawford, Multari, and Clark. Land Use Element Environmental Impact Report, adopted 2002. • Noise Ordinance. 1992. City of Atascadero. • Pacific Gas and Electric (PG&E). Final report of the Diablo Canyon long term seismic program, U. S. Nuclear Regulatory Commission, Docket 50-275 and 50-323, San Francisco, California. 1988. • Peterson, M.D. et al. Fault slip rates and earthquake histories for active faults in Southern California. 1994. • Youd, T. L., and Idriss, I.M. Liquefaction Resistance of Soils: Summary Report from the 1996 and 1998 NCEER/NSF Workshops on Evaluation of Liquefaction of Soils, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 127, No. 4, 2001. • Zoning Ordinance, part of Municipal Code,.City of Atascadero, as amended through 1999. Project -Specific Sources • Anderson, R. B., Hardy, T. R. 2006. Review and Evaluation of Significance of Impacts: Repair and Rehabilitation of Atascadero City Hall. • Project personal communication with Mr. Steve McHarris, Deputy Community Development Director, City of Atascadero. • Pfeiffer Partners. 2005. Atascadero City Hall Damage Assessment and Rehabilitation Plan. Prepared for the City of Atascadero. • Earth Systems Pacific. 2004. Soils Engineering Report, Atascadero City Hall Seismic Repair/Retrofit, Atascadero, California. Prepared for the City of Atascadero. W -0i1 APPENDIX A MITIGATION MONITORING AND REPORTING PROGRAM CITY OF ATASCADERO INITIAL STUDY Appendix A PP Timing Responsibility Mitigation Mitigation Monitoring Program /Monitoring Measure Atascadero City Hall Repair and Rehabilitation Project GP: Grading Permit PS: Planning Services BS: Building Services BP: Building Permit TO: Temporary FD: Fre Department PD: Police Department Occupancy FI: Final inspection CE: City Engineer WW: wastewater FO: Final Occupancy CA City Attorney AMWC: Water Comp. Mitigation Measure AQ -1. Prior to construction, the BP, FI PS, BS, CE AQ -1 contractor shall prepare and submit for approval, a health and safety plan for addressing asbestos issues. If asbestos is present, then the APCD may require preparation of an Asbestos Health and Safety Program and dust mitigation measures under guidance of the National Emission Standards for Hazardous Air Pollutants (NESHAP). The APCD has the local responsibility to regulate material containing more than 1 percent asbestos; therefore the City shall hire a licensed asbestos abatement contractor if asbestos is known to be present. Mitigation measures would include stabilization of debris by wetting and covering with plastic sheeting until they are removed. Furthermore, the contractor hired to perform clean-up shall submit an asbestos notification form to the APCD. Mitigation Measure AQ -2. During construction, the BP, FI PS, BS, CE AQ -2 contractor shall employ a qualified, independent testing lab to conduct field sampling and lab testing of paint for detection of lead. This will include removing paint samples from the building and testing for lead content. A report shall be prepared indicating areas of detected lead and a Lead Work Plan shall be developed. If lead is detected, all loose paint and particle that could become airborne shall be scraped from the building within an enclosed area covered with plastic sheeting to prevent lead -containing particles from becoming airborne. With incorporation of mitigation, any potential lead exposure to the public is considered a less than significant impact. Mitigation Measure GEO-1. The City shall implement BP PS, BS, CE GEO-1 the preliminary geotechnical recommendations contained in the Soils Engineering Report (Appendix C) and/or measures identified through subsequent A-1 In CITY OF ATASCADERO INITIAL STUDY Appendix A Pp Timing Responsibility /Monitoring Mitigation Measure Mitigation Monitoring Program PS: Planning Services Atascadero City Hall Repair and Rehabilitation Project GP: Grading Permit BP: Building Permit BS: Building Services TO: Temporary FD: Fire Department PD: Police Department Occupancy Fl: Final inspection CE: City Engineer WW: Wastewater F0: Final Occupancy CA. City Attorney AMWC: Water Comp. engineering design to minimize impacts to geology and soils. Mitigation Measure HAZ-1. Implement- Mitigation BP, FI PS, BS, CE HAZ-1 Measures AQ -1 and AQ -2. Mitigation Measure NOI-1. All construction activities BP PS, BS, CE N01-11 shall comply with the City of Atascadero Noise Ordinance for hours of operation. The hours of construction may be modified by the Community Development Director upon a determination that unusually loud construction . activities are having a significant impact on the neighbors, such as the Atascadero Junior High School. Mitigation Measures TRA -1: Traffic Control Plan. The BP PS, BS, CE TRA -1 City, in coordination with the Atascadero Unified School District, shall develop and implement a traffic control plan to reduce construction -related effects on the local street system. Construction vehicles, worker commute vehicles, and equipment shall be staged on the section of Palma Avenue between East and West Mall Road in front of the entrance to City Hall and Sunken Gardens. This section of street shall be closed to the public during periods of project construction. City guidelines for temporary road closures shall be followed, including notification of nearby businesses of this closure. The Traffic Control Plan shall ensure that access to these businesses is not substantially affected. A-2 APPENDIX B HISTORICAL RESOURCES REPORT REVIEW A/iD. E.VALUATIOA OP f IGAIFICAMCE OF IMPACT -f Repair and Rehabilitation, of Atascadcro City Mall cor�T��.;p REVIEW and EVALUATIOA of_rIC HCA.... of 1MPAGTJ Repair and Rehabilitation of dtascadero City Hall REPORT 'f U;MMARY THrs REPORT consists of a detailed. review and evaluation of the significance of impacts of the first phase of a project to repair and relhabilirate Atasca:dero City Hall. The Arascadero City Hall is an historic property that is listed in :the. Narional Register of Historic Places and registered as a California Historical Landmark . The City Hall sustained substantial 'structural and. architectural damage during theSan Simeon earthquake of December zz, 2003i renderin g it uninhabitable: The project's first phase consists of a work scope of some 55 items, as delineated by a team of architectural..and.:engineering. consultants retained in 2004 by the CityofAtascadero. The majority of the scope irems'are classified as restoration activity, specifically, those actions or treat mrs thavare intended,to restore character -defining elements of the building to rheir original mi8'condition and appearance. The other scope items are.dassified as deferred maintenance activity, specifically, repair work intended to:extend and.enhance the -life of City Hall, i.e., improving the infrastructure of the building to a condition superiorto that which existed prior to the 2.063 San "Sirneon earthquakes Based upon the information contained in the reports, plans, documents'and other materials used to conductxhis review and,evaluation, it appears that the 55 scope 9 ReV E-Vand EVALUATION offIGAINcAAct of IMPACTr Repair and Rehabilitation of Atascadero City Miall items of this project's .first phase.are consistent w ith,and in -.general conform.,to; applicable policies and procedures ofThe Secretary:of the Interior's Standards for Rehabilitation and Guidelines: for Rehabilitating f listoric Buildings.: Therefore, and pursuant to Section 15o64.5 (b)`(3) ofArticle.$ of Guidelines for the Ca.liforn.ia Environmental.QualityAct; this frst.phase work can. be:considered.a.s mitigated to a level -of less than.a significant impact on the eharacte"efi ling features an d: historic integrity;of Atascadeio CityHa11. REVIEW; and :EVALUAT'iPA.Of f7GAir IC/a1IGe of. IMPACT/ Repair and Rehabilitation of Atascadero:City Hall f1ETHQUoLOGY THIS RE'POR.T was17reparecl by Robert Bruce -Anderson and Thomas Rex Hardy, AfA. Mr. Anderson is an urban designer and.. conservationist who specializes in the interpretation and use of design standards and :guidel nes with respect to historic properties and cultural landscapes. Mr.1-fardyis aregistered ,architect in the State of California, whose practice.lacuses on the design, materials. and adaptive use of historic.struc.rures Mr. Anderson. and. Mr.. Hardy meet The. Secretaryof thelnterior's Professional Qualiekations Standards for -Historic Architecture, Historic Preservation Planning and/or -Architectural History per the Code of Federal Regulations, 36 CFR Part 61. Mr. Anderson and Mr Hardy ins0ected ..Atascadero's historic CityIfall building arid: grounds ron twit occasions, on October 6 and October 26;.2 oo6.. Staff of the Cityof Atascaderowere;presmt on both:occasions, and Stephattie'ICingsnorth, AM Pfeiffer Partners, also was present on October --6_ Mr. Hardy selectively photographed character -defining features of the subject property during the October 6 :site -dsit. Meetings were conducted with: staff ofthe City of Aiascadero on October'6 and October;6; with Stephanie Kirigsnorth on Octoberz6;.And Lon.Allen;, past. president of the Atascadero Historical Society, on. October 27: Staff'of the City of Atascadero, Stephanie Kingsnorth and Tion Allen provid. ed copies ofdocumeints,plan drawings; l istcric photographs -and other materials; all of which have been treated as primary sources for this project. .4 REvittt and EvALUATIo/i of`_AGAIF1CAACe:of. i.MPAGT f Repair and Rehabilitation of Atmcadero<City fail The .historic photographs which appear in: this report wereprovided courtesy of Lon Allen, from archives of the Atascadero Historical Society. The report's contemporary photographs come from two 'sou rces, Pfeiffer Partners and Thomas Hardy. As. described in greater'detail in the next.section ofthis:report, under the heading PROJECT .DESCRIPTION, this project consists of some 55 specifiicworkite.ms far the repair and rehabilitation of.Atascadero City Nall_ The Purpose of this .report is to review and evaluate each of these 55 work items as to their potential impact on . the.historical significance of Atascadero City .l -fall, per applicable statutory provisions of the California Environmental Quality Act (CLQA). This report provides a review and;evaluation of the project's .potential impact of 55 specific work items based upon -;scope of work and product generation as follows; ■ Site visits to observe and record existing conditions -of character -defining featu res;, Review of.existing reports, documents and drawings as specifically relevant to repair andirchabili tation of.the historic City Hall structure; ■ Mekings:�%vith City staff, the project architect and a representative.of"the local historical society to obtain. additional information and clarification regarding the nature and extent of certain work items; Simplification of as:=builtdraywing$:toserve asplar and. sectiondrawings.or use in this. report; Zoning" ofthe historic structu.re's character -defining features, as defined. and illustrated in plans and sections; 5 — Construction of a matrix that summarizes information for each of the Project's first phase work items, including location by zone; reference to Pfeiffer Partners documents, nature and. extentof'procedure, and impact(s); ■ A more detailed description and evaluation ofpotential impactof cert in work items; and. Report conclusion. Rtvit / and EvALUA-t10A.offfGA[F1CAACE of IMPACT) Repair and Rehabilitation of Qtascaderci City ball . PR©1f uT Pf-/'C RIPT[Ot* THIS PRO-IFCT consists -of a series of.actions designed for the repair and rehabilitation of Atascadero City Hall, a historic propencythat is listedin the National Register of Historic Places and registered as a California Kistorical Landmark. The City Hall sustained signi&cant. structural and architectural damage. during the San Simeon earthquake ofDecember :Z2, 2o63, rendering it uninhabitable_ Funding for each of three phases of this project is to come from cornpletely.separate and different sources. The anticipated funding source for the. project's. first phase is a grant From the California Cultural and Historical Endowment (CCHE), a requirement of which is that all projects funded byCCH:E. must eamply with provisions of the California Environmental QualityAct (CEQA)'. It is this.first phase of:projectwork, and the requirement of the funding source that all project work comply with statutory provisions and guidelines of CEQA, that,are the key determinants of the purpose, scope and subject matter of this report. The first phase of: the. project addresses specific items ;far repair; maintenance.and rehsbilitation.of.Atascadero City Hall, as delineated by a`team of arcb-itectural and engineering consultants retained in 2004 -by -the City of:Atascadero. This team vias led by Pfeiffer Partners Inc, of I;os Angeles. As delineated by Pfeiffer Partners and. their consultants, the S'S specific items that constitute the.scope ofwork:for the project's Pirst phase fallw. ithin seven major categones: Exterior Cladding. " Roofing, Waterproo ringand.Skylights 7 REVIEW: and:.Evat:UATton ofjrIGAIFICAMCE of IMP,ACTr Repair and Rehabifitafion of Atascodero City pall ' Interior, Partitions, .Doo:r. and Glazing • Floor and Roof Structure Repairs Pluml ing'Sywm Repairs Hearing, Ventilation and.AirC,onditioningRepairs ' Electrical. Lighting, Power and. Communicatian Repairs. Pfeiffer Partners, and their consultants have classifiedwork. items within the first three categories noted above as restoration activity, whereas workitems the Last four categories noted above are classified as deferred rnaintenance activity. With respect to this particular proiect, restoration activity consists of those_action.s:.or treatments intended to restore character -defining: elements of the bu.ild.ing to;their original 19j.&condition and:,appearance, whereas deferred maintenance activity consists of repair work intended to extend and'enhance the life of City Hall, i.e:,: improving the infrastructure of the building to -a condition superior to thatwhich existed prior to the;San Simeon earthquake. Elsewherein_this:repo:rt the reader will find a.MATRIX., in which the gs`itemsof this first phase are listed, the nature and extent oftbeir work described, and their -potential impacts) evaluated. This report provides a,detailed review and evaluation of the potential impact(s).ai the project's first Phase ofworlc on the historical significance of City Hall, This; review and evaluation are intentionally responsive to Section 15o64.$, Article>5,:crf CEQAGuidelines, "Determining the Significance.of Impacts on Historical anal Unique Archeological Resources" Further, this report will nffer an: assessment of the potential impacts) ofthe p oject'sfirst phase ofwozkpursuant to paragrapb (b) {3} cif Section 5o6 -5--13erferally,;3 liraject that follows Tlie ctvtaty.: f't 4 Intertior sSta ndanis jar the Treatment ofFlistor7c,Pmp wties tuith Guidelines for Preserving Rehabilitating, Resdoring;and;Rc:constrvcdng Histarie Buildings or the Secretary of the. Itrteiior•sStandardsfairRehabilitationand GuidelinesforRehabilitatingliistoricl uddings (1995), Weeks and Grimmer, shall be considered as mitigated.to a level. of less than a significant impact on .the historical resou rce". a REywv and EVALUATFON Of -f lGAMICAACE of IMPACT) Repair and Rehabilitationof Ataxodero Gity Hall PROPERTY DEfCR.IPTIOA THE CITY ofArascadero's City Hall, also known, by 'its historic name, Administration:Building, is an extraordinary civic edifice thatwas designed by Walter D. Bliss of the prominent San Francisco office of:Bliss & Faville. The general contractor'for the building was F O Engsaum. The buildingwas erected beginning in .191 , was completed..in 1918, and. was, intended To serve as the administrative, symbolic and architectural centerpiece -of the Atascadero Colony, a:planned: community that was envisioned by the publisher and entrepreneur, Edward Gardner Lewis: I `' W. M'.z WLrel v77. r i i�»sem Photograph: N6.1 Early view, lookingnorth, of theAdminisiration Buil ft of theAtastadero Colony: The Ci ry Hall is a four-story domed sett cwre,.consisting of approx mately`S$.gS4. gross. square feet of floor area. Its archirectural style indicates derivation from Italian Renaissance sources; an influence also evident in thea chitecture of several M Rum -w .and EVALUAT10A: of,fJGAIFJCAACC of IMPACTf Repair and Rehabilitation of Atascadero City Hall .other. Bliss & Faville buildings. Belowthefourth.floor, the building's structural' systems consist of reinforced concrete floors. and columns and unreinforced masonry infill walls'. Above the fourth floor, the structural systems consist ofwood . floor and.roof framing supported, on unreinforced masonry Bearing walls.The building is raised on a podium foundation; and the building's distinct ive;plan is characterized by the commanding presence of two rotundas,; on the first arid. fourib floors. Photograph No. z Historic photo of upper sh rotunda own o en o ice Wp f cop ora on and mezmanine railing. The:,building..s..mterior is clad with.a texturedyellow brick, offset `with terra corta and:marble ornament <The &med roof is tile: and the- lower'roofs are eoznposition,. The eaves on ehe itile.roof are wood. Most of the windowsare double hung v�rh. wood sash;: the noticeableexceptiari x ngthe circular:wood-sashwindows:oi ;the: third floor above -the entries. on Palma and .I ewis.Avenues. Terra coria is.used to: frame pedimented entries, and to finish arches,:Ioriic columns:, -:entablatures and soffits at entries, Allegedly all of the bricks used in construction of City Hall were fabricated at a local brick planrlocated`at the base of Pine Mountain', fac iii! fhe Salinas River and close to where Curbaril:Avenue_crosses the. rail road cracks. REVIEW and F-VALUATIO/1 of.J1GAIrICAf9C _ of. IMPACT) Repair and Rehabilitation of Atascadero C.i.ty Mail The interior of CiryHall consists primarily of three floors of circular corridors and. offices which. surround. a 40400thigh, first floor rotunda, and.a fourth floor with a meeang room, apartmerit, kitchen :and. storage rooms which surround a 44 -foot high, fourth :floor rotunda. in contrast to the first three floors; xhe fourth floor lacks a circular corridor. The -Palma and Lewis Avenue entries feature two-storylo.bbies, The basement contains mechanical:equ pment;rooms, service areas and storerooms. Photograph No.3 Historic photo of lo". r rotunda showing original opening{.one offour) into Second floorcopidor. Note the .an}ountofEght-co ming through the hinette u4ndmv. The first floor, or lower, rotunda is the defining and most impressive space:ofthe building. The dome`s: coffered.ceiling, the #luted. Ioniccolumns'thar support the dome, the molded plaster chandelier suspended.horn a gilded central°medallion, and -four:lunerte:windoNvs:cut- nto::rhe base of the dome at thexhird.floor are major contributors:lo this exceptionallygmnd:space. The fourth fluor, or:.upper, rotunda Js amoctagonid space which features eight square coluinns.and. r6 round columns with.Corinthian capitals,.a mezianine 1.evel.withplain railings,::bays with round and double-hung.wood=sash windows, and:.an octagonal.=shaped painted glass. laylight that terminates a -dome ceiling covered with acoustical.tiile Rtvitw and IrvaLUATIan OU 1GAINCAACE of IrivaCTf Repair. and Rehabilitation of Atascadero City flap The second. and third floors ofbffices:are :accessed -from .stairs located adiacenr_to the circular corridors at south and west cornets. of the building, and an elevator. located within the two-story lobby at the Lewis Avenue entry. The fourth flooris accessible from a second set of stairs, located;at northwest and. southeast: axis: points on the:circular corridor of the third floor. 1?hotograph No. 4: Historic. photograph (ea-r9zoj Shounng orgrnal:entry rncluding paired urood d. oor4, transoms with. tare -divided lights and pedimented. terra cotta fcnMCI fill 1 -19 Iff 2 iNI City Hallhas .experienced numerous' alterations Wits interior spaces srncesitfirst accommodated offices of the Atascadero Colony[eginning in t928. In' large measure, these alterations are,t}e result of numerous>tenants who have occupied the building since its origtr al.coxist uctioni. Tho- building's::lterations and,;fienar is: are chronicled in derail:in the 1988 Historic:Mructtmes;Reportprepared for the Cityof Atascadero by the Oflice.ofAl ce Carey, Arcliirects Iris notewort} ythat the structure's; exterior has :experienced relatively few alterations the most obviousof 13> REVIf+b1 and EY.AwATI1.UM of . G/IIFIGA/ICt= of IMPAGTl Repair rind ReFtabilzfation of ,Aw ;s gdero City ball ;. being essential far use and enjoymentof the property; however, such features do - . . not;cantcibute to the property's historical significance or i1.ntegrity. The size,. placement and.use of materials of these features can negatively affect or impact features of rima or secoiida im ortance. Accordin 1 , while ma'oralteration p rY �' P g y l . re-design,or removal of features within: this zone is not of particular concern, care s .11 . must he exercised that. such.changes do not compromise or diminish the . till1. integrity of featu res of primary or secondary importance. The character defining _ .. 4 features included in this category arz zoned in GREEN in the illustrated plans and ser..trons. C:�uideliiie forpraject actions cnntemplated.withn thiseategary ." You are free to procr_ed". :. 1. .. . r . ;; .::.. } . AT. .. .. r. ., .. .... _.. _. misting Basement Level Floor Plan 18 REWEW and E:VALUAT1C3ff af�'r�nrrycancE of IMPACTJ Repair, ond.Rehobilitotion of Atascadero City Mall REVtE�J and 1rVbLtiATiali of,,nGAIFICA�ICE of IMPACT) Repair and Rehabilitation' bf Afmcadero City Hail } � S ff F i ..-. T k+. i 11 � F r r .. S Existing Section A 25 REV1Ei1 and EVALUATIOA of jVAIFICAACE of IMPACTf Repair and: Rehabilitation cif Ata scodero,City l�gll y 1 * moi, ;r I sr � 'E. V f _ 1' Y c xx .. .'.. 1 'a yew F, sting Section B 26 REVIEW and EYALUATIOA of;r[GAIhCAACE of IMPACT/' ` Repair and Rehabilitation of Afascodero Gty Ball fIQ rT PHA,fE PROJECT MATIZIX CoNSTRUCTION OF A. MATR.[S expressly for this reporthas produced a tool that greatly facilitates this review and evaluation of the significance of. . impacts of the project's first phase work items: The matriu lists the'$S scope items, within seven categories of work, that constitute the scope:ofthe firstphase undertaking as defined by the architectural and engineering team ledby Pfeiffer Partners. The matrix indicates the particular zone(.,) in which work on the scope item occurs; page reference to Pfeiffer Partners document.. that explains existing condition of scope item and nature of work to. be performed; and a. summary assessment of the significance of impacts) ofthe scope item work. ;. In the Neiiiffer Pa triers documents,:the first phase project work is classif'ed as tw:o types: Restoration, which consists Of 41 scope items.. and Deferred. . TVtaitite:nance' Infrastructure, which consists of 14 scope items. Subsequent phases.of repair and rehabilitation work at City Hal[are classified. in Pfeiffer Partners documents as Damage Repairs, Seismic Upgrade and ,Mitigation, and Repairof Existing Code .- Deficiencies. For further information regarding scope-of work items categories'of work and'phases of work byclassificatio n, thereader:is relerred to the project's pre- . , design cost model as it appears in Appendix Ii in Volume II of the Pfeiffer Partners documents; April 2005. . r`llmost all 6fihe41 scope items under the heading of Restoration. involve repair; cleaning, replacement and/or reconstruction of historic character-definin features of City Hall. One notable exception is scope item no. 1. b, a under exterior:doors 3 and frames: "Reconfigure existing exterior masonry to match apposite corner, due to door replacement". This item warrants further discussion; to follow below. T I r E REVIEW and EVALUATIO/1 offir.n(FICAACE of IMPA.C.TJr Repair and Rehabilitation of Alascadero City Mall Scope Item II e., "Remove and replace all painted glass. in upper rotunda [dome]'ceiling with new translucent tempered glass to march historic pattern". This action.calls for removal of all existing painted glass in the upper rotunda dome ceiling laylight, and replacement with new translucent tempered glass to match the historic pattern. (This action isnot to confused with, or otherwise construed as, restoration of theoriginal'skylight located in the upper rotunda dome roof) Repoli, and RchobIDlahanof Atoxadero Clty Mail rrst Phay-Project hipact tvaluatlon Rroronce No. EM S;DF E 7T dJ Repair F R O:C E D U R E I M P A C T (S")c Symbol RESTORATION WORK 1. EXTERIOR CLADDING a. Exterior Finish Repairs vII; page G-4 Remove material to 1-712" depth; install Dutchman patch using niinimum two stainless steel anchors into substrate This action is unlikely to have any appreciable impact since 1 Pin loose decorative terra cotta Pr BS IDP with solid bedjoint. Color match mortar at perimeter of it repairs historic materials in an appropriate manner, - patch. consistent with The Secretary's Standards and Guidelines.. 2 Repair decorative terra cotta glaze and bisque vII; p,G-3 Remove loose and deteriorated glaze coating. Install new This action is unlikely to have any appreciable impact since spalls Pr GS / C glaze coating to match existing.- itrepairs historic materials in an appropriate manner, - consistent with The Secretary's Standards and Guidelines, Remove masonry in area. Salvage terra cotta and - V11; P. G -S untracked race brick for reuse. Epoxy bond and pin together cracked pieces of terra cotta. Epoxy inject cracks This action is unlikely to have any appreciable impact since': 3 Rebuild displaced masonry Pr triangle / RM in backup walltivhere indicated. Rebuild masonry to match it repairs historic materials in an appropriate manner, appearance of original fapade, Replace individual units consistent >vitlt The Secretary's Standards and Guidelines, where indicated. Coordinate withstructural work. For repair symbol: P Patch terra cotta as described for the condition BS. Remove loose and deteriorated material to a sound substrate. Square off perimeter of patch area, do not overrun cuts. Minimum patch depth shall be 314". At corroded steel reinforcing remove material to expose all.-. " sides of bar, Clean exposed reinforcing by sandblasting, vII; p. G-6 install rust -inhibitive coating. Install color -matched This action is unlikely to have any appreciable impact since 3 Patch spalled brick Pr S / P & DP patching mortar In two lifts. Cure; patch for seven days it repairs historic materials in an appropriate manner, with plastic covering: consistent with The Setretar}N Standards and Guidelines, For repair symbol; DP Dutchman patch material to match existing color and texture of substrate. Remove sound and: unsound. material to minimum depth of 11/2", lnstall.Dutchman using a minimum of two stainless steel anchors into the substrate and with a solid bcd joint. Install color -marched patching mortar at the perimeter of patch. Repolr a9d Rehbbl lallan o± Atwcadero Oy Moll rkot �hwe ProJed h;rpact Cvaluialion No. SCOPE' ITEM Zone Reference Condsion/Repair PR.00FDURt 1MPACT(S.l sM�a Remove loose and deteriorated material to sound substrate: Remove material to expose all sides of corroded steel: Remove and replace dams 1e p damaged are coating P g g Pr vIt; p. G-7 D / P Sandblast reinforcing steel and apply rust- inhibitive cooling. Minimum patch depth;of 3/4". Square otTperimeter ofpateh.area avoiding overrun cuts. Install color matched -patching mortar ur hvo lifts. Cure patch for seven days with.plastic covering. This action is unlikely to have any appreciable impact since it: repairs Historic materials in an.apprapriatc manner, consistent with The Secretary's Standards and Guidelines. For repair:symbol: RP. Grind crack toprofileof 1/2" wide hp 3/4" deep. Point crack with mortar to match color and texture ol'substrate: 6 . inject epoxy into cracked brick and terra cotta Pr vli;p,G-8 C l RPI Coat crack repairs In terra cotta with glaze repair coating. For:repair symbol: I inject crack with epoxy. Unless specifically required, da not rout crack. Apply.surl'ace seal to crack that will not This action is unlikely to have any appreciable impact since it repairs historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines, { mar the existing finished surface of the terracotta, brick or cast stone, Install injection ports in mortarjoln.ts or use surface mounted ports: 7 Repoint open mortar joints in brick and terra cotta Pr vll; p. G-1 G, M- 28 1,2,3 Remove sound and unsound mortar from joint to a minimum depth 3/4", Remove additional unsound mortar as required untJl sound mortar is encountered. Install pointing mortar in 3/8" lifls beginning at the back of the ` joint. A minimum of two lifts is required. This action is unlikely to have arty appreciable impact since it repairs historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines, 8 Replace 12 missing.stone pieces. 7 I r v1h P. 0-12 MS /none' Install new stone pieces to match original installation, This action is unlikely to have any, appreciable hapset since it repairs historic materials in an appropriate ro trate manner, consistent with The Secretary's Standards and Guidelines.. 4 Prep and paint exposed steel lintels Pr VII; p. G -M Prepare and paint allstect window and door.Hritels. This action is unlikely to have any appreciable impact since ills a routine maintenance action that restores the appearance and weather protection of the original paint j coatings. 10 Remove mortar dro m s on surface of tents cotta PP f from previnus repairork Pr vII,• p.G-15 None /: Typical facade repair 7 Remove mortar by scraping wlih stainless steel scraper. Patch all exposed DS undGS as described elsewhere:, This action is unlikely to have any appreciable impact since; it re airs historic materials in an appropriate manner, P consistent with The Secretary's Standards and Guidelines. Reference No. SCOPEITEM Zone Condltlon/ Repair PROCEDURE 1 M .PACT (<S i [+tymaot I 1 Repair cast stone column bases Pr vII: p.G-33 Remove and replace cast stone bases ofall freestanding This action isttnli:ely to have any appreciable impact since it repairs historic materials in an appropriate manner, and engaged columns at each elevation, consistent with The Secretary's Standards and Guidelines. b, Exterior Doors & Frames - Replace non-historic aluminum entrance doors The new doors and transoms are likely be compatible and 1 with new Mopes metal doors and hansom to Pr Drtwving: New I lope's steel doors and transoms to be configured in appropriate, since they will be designed and fabricated to match historic pattern. - Al 1 IMOD sizes and patterns to match historic patterns, match the historic pattern of divisions and muntins clearly visible In historic photographs, Drawings: Precise details will not be available until first phase IDD 2 existing exterior masonry to match ReconfigurePr A1111,�9(3D & Cut opening and reconfigure masonry at south corner work is completed, butthis action is intended to result in an opposite corner due to door replacement. R7 similar to doer at opposite comer on west corner. alteration similar to the.aheration made previously at die opposite carnet, This routine maintenance action is unlikely to have any 3 Prepare and paint existing door lintels Pr v11; p.G-30 Prepare and paint steel door lintels, appreciable impact since it restores the appearance and weather protection of the original paint coatings, c. Exterior Soffits - - This routine maintenance action is unlikely to.have any 1 Prepare and paint peeling roof eaves Pr vI1; p.G-29 Prepare and paint wood components of roof eaves. appreciable impact since it restores the appearance and weather protection of the original paint coatings. Prepare and point peeling exterior plaster This routine maintenance action is unlikely to have any 2 at entries Pr vIl; p.G-34 Prepare and paint exterior plaster ceilings and soffits, appreciable impact since it restores the appearance and weather protection of the original paint coatings. d. Exterior Balustrades, Parapets and Roof Screens install epoxy pin anchin cracked terra cotta v1I;p.G-39 Remove tie-wires between terra cotta and metal bracing, This action is unlikely to have any appreciable impact since I balustrades , r Pr Drwg. R8 htstall new terracotta anchors, it repairs historic materials in an appropriate manner, consistent with The Secretary's Standards and Guidelines, vii; p.G-3 Remove loose and deteriorated glaze coating. Install new This action. is unlikely to have any appreciable impact since 2 Repair terracotta glaze spalls Pr DS / C glaze coating to match existing_ it repairs historic ntnterials in an appropriate manner, consistent with The Secretary's Standards and Guidelines. Rotorence _. NO. SCO P E I T E M Zone Canditlonr Repair PROCEDURE IMPACT(S) Symbol For repair s1mbol: P For smaller spalls: Remove sound and unsound terra cotta at the spall location to form a square, 112" deep patch. Install color-matchcd patching mortar in two lifts, Cure - patch with plastic covering. Apply glaze coating to patch. For larger spalls: Remove loose and deteriorated material to a sound substrate. Square off perimeterol'patch`area, <' do not overrun cuts. The minimum patch depth shall be 314". At corroded steel reinforcing remove mnterial to Replace terra calfs blocks that have significant. v11; G-4, 6 expose all sides of the bar. Clean exposed rein forcing iby This action is unlikelylo have any appreciable impact since. 3 spalls Pr BS / P & i71. sandblasting, install rust-inhibitive conting. Install color= it repairs hlstoric.materials in an appropriate manner, matched patching mortar in two lifts, Cure patch for seven consistent with The Secretary's Standards and Guidelines. days with: plastic covering, . For repair symbol: DP Dutchman patch material to be terracotta salvaged from other building locations or new terra cotta to match existing chlor and texture of substrate. Remove sound and ` unsound terra cotta to minimum depth of 1 1/2". Install Dutchman using a minimum of two stainless steel anchors Into the substrate and with a solid bcd joint: Install color- matched patching mortar at the perimeter of the patch. Remove masonry in the arca indicated on drawings. Salvageaerra colla and uncracked face brick. for reuse. v11i P G $ Epoxy bond and pin together cracked pieces of terra cotta. This action is unlikely to have any appreciable impact since 4 . Inject epoxy into terra cotta and brick cracks Pr triangle / RM Epoxy inject cracks in backup wall where indicated. it repairs historic materials in an apprepriale manner, Rebuild masonry to match appearance of original facade: consistent.with The'Sceretary's Standards and Guidelines. Where indicated by Blk or [Irk replace individual terra cotta or cost stone blocks or individual bricks Drawings; This action is untikely to have any appreciable impact since 5 Repair the existing steel balustrade bracing Pr SR2.5; R8 Add h x 6 TS vertical parapet bracing. it is located on the inside of the upper parapet walls and will not haveany<visual impact from any public right-of-way. ti install new pargc conting at top surface of brick' .: 1'r vil; p, G-36 Install new cement plasterparge coating at top surface of This action is imlikclyto have any appreciable impact since it repairs historic materials in An appropriate manner, parapet brick parapet on the exterior side orthe balustrade._ consistent iditlt The Secretary's Standards and Guidelines. 1 t , r M AM:P A Q T if 7 Repaint feria cattujnnnls at balustrade 1''' r11• . G-37 Repoint lOQ°ro orjoints inaerra cotta blocks of balustrade This action is unlikely to have any appreciable impact since it repairs historic materials in un appropriate rttmnner,' Drtvgs. R2-R7 and top surface of 4th floor crater table. consistent with The Secretary's Standards and Guidelines, vIP G-13 p. Clean aren with warm. water, low-pressure rinse. Scrub .. with organic growth using natural liber, bristle This action is unlikely have any appreciable impact since 8 Clean organic growth an balustrade g Pr OG. / Clareas brush; Follow up at arras with remaining:organtcgrawth it Cleans historic materials with the gentlest means, Drw s. RZ-R7 g with diluted citric acid cleaning; consistent with The Secretary's Standards and.Guidelines. The original spacing, proportions and profiles of, the historic balusters can be discerned from historic photographs; $o Remove CMU infll tri balustrade Rad replace with �[I; p. G-38 Remove existing croncrete block infill.in balustrade and . reconstruction of Uicse missing elements is, an appropriate new.ierra cotta balusters to match historic pattern Drtvg. R8 install new terra cotta balusters whh approximate spacing treatment consistent with 1.he Secretary's Standards.and of 9" c Guidelines.. A discrete mark can be fabricated on each new baluster to indicate the date of installation as restoration work. e; < Miseelloneous Exterior Work I Prep and paint all cost stone Pr vl,, p, 282 Prepare rind paint columns and bases. This action. Is unlikely to have any appreciable impact. v.11, p. 1 l Clean.area with warm water, low pressure rinse. Scrub areas with efflorescence using natural fiber bristle brush, Thu action is unlikely to have any appreciable impact since. 2 . Clean off' all efflorescence Pr EFF / CI Follow •up at areas with remaining efflorescence with it cleans historicmalerials with the gentlest means, Drwgs. R2-R.7 diluted citric acid cicnning, consistent with The Secretary's Standards and Guidelines. . WS-C[ Clean area with warm K ater, low pressure rinse. Scrub areas with water stains using natural fiber bristle brush. This action is unli[:e1y to have any appreciable impact since:. 3 Clean off all water. stains Pt Drwgs. R2-R7 Folloiv-up at areas with remaining water stains with' it cleans historic materials with the gentlest means, diluted citric acid cleaning;' consistent with The Secretary's Standards and Guidelines. vR; p., 1:3, 24 Clean,ares with warm water, low pressure rinse. Scrub area with organic growth: using natural fiber bristle brush, ThLs action is unlikely to have any appreciable impact since 4 Clean off all organic growth g Pr . GG 1 CI & CT Follow-up at nreas with rennnining organic growth with, it cleans historic materials with the gentlest means, Drwgs. R2-R7 diluted citric acid cleaning. '. consistent with.The Secretarys Standards and Guidelines. IL : l3QOP1MG WATERPROOFING,& 3!91IOHT3 This action is contingent on approval for re-lcvcling Install below grade membrane waterprnafing to Install below grade membrane waterproofing to building In other phases and willnot occur if the building is a. foundationwalls Fr vH. Appendix 1I foundation walls [in conjunction with structural re-leveling not re-leveled. if implemented, this action would not be of the building].visible, since it would occur below grade and is unlikely to have any appreciable impact. Reference No, 5,C O P E l 7 E M Zone Condlttonl. Repair PROCEDURE aM - IMPACT (S") �f Symbol . b. Clean fascia flashing at touring Fr ' vit. Appendix I 1 Clean fascia flashing at hoofing, This routine maintenance action is unlikely to have any appreciable impact c. Fasten uncompleted roofdrains - Fr vil; p, G-22 Remove. strainer. Secure clamping ring. This repair action is unlikely. to have any apreciable p UD l SD impact. a, Add bird stop Fr vll. Appendix 11 Add metal screen bird_stop in one location on roof. This action is unlikely to have any appreciable impact Remove and replace all painted glass In upper Remove and replace all painted glass in upper rotunda e. rotunda dome ceiling with new translucent pr Drawing: Al 14MOD dome ceiling with new translucent tempered glass to match historic pattern. (This does not restore he impact is likely to range. from neutral to positive. tempered glass to match historic pattern -.._ procedure the original skylight a[ the.upper rotunda dome root). C Restore skylights above two nnain staircases Fr Drawing: Ali 4MOD Restore visual elTect ofskylight openings above two main, staircases at fourth floor. The impact is likely to range from neutral to positive. g.. Miscellaneous caulking and sealing Al] v11. Appendix H. This covers caulking'and scaling throughout the building" This maintenance action is unlikely to have any appreciable as necessary toimplement all scope items in this phase. impact, ill.° INTERIOR PARTITIONS, DOORS '& GLAZING a. 115artItIons 1 Recreate overlooks into first floor rotunda. l r Drawing: Reopen existing overlooks.into lower rotunda. Restore This action is intended to return to the original design intent and character of the rotunda. The impact is likely to range At 12MOD damaged plaster at existing infill walls, from neutral to positive. Construct light boxes at previous clerestory. Drawin : g Construct light boxes behi id lunette windows in lower rotunda. (Light box will be in interstitial space, not visible The intent is to maximize appreciation of the rotunda spacer locations in lob}�errotunda A] 13MOD form public spaces.) The impact is likely toxange from neutral to, positive. 3 Construct light boxes al previous clerestory p D' Pr A500,A501 Construct light boxes behind circular windows in upper rotunda dome ceiling. (Licht box will be ur mterstihal The intent is to maximize appreciation of the rotunda space. locations in upper rotunda space, not visible form public spaces.) I'he impact is likely to range from neutral to positive. b, Balustrades & Rails ReopenB overlooks into floor rotunda Drawing: Re -open overlooks into first floor rotunda that were enclosed by plastered partitions at an unknown time. This action is intended to return to the original design intent 1 deme, rebuild railings, rebuild low wall and install g glass pr Al 12MOD Restore missing or damaged corner corbels and rebuild and character of the rotunda. The impact is likely to range ' low guardrail wall, from neutral to positive, 2 Remove existing r ailing and replace with new to Drawing: Remove non -historic railings on mezzanine in tipper - rotunda and replace with new railings to match historic This action is intended to return to the original design intent match historic pattern Pr AS00; A115MUD �ttcrns ands acro as discerned from historic p` spacing and character of the rotunda, The impact is likely to range, p y photographs.. __ from neutral to positive. Nn;•. S G O P E ITEM Zone Condition! Repair PROCEDURE I M P A.0 T{ S ) Symbol DEFERRED MAINTENANCE INFRASTRUCTURE iV. FLOOR & ROOF STRUCTURE _REPAIRS a-. Repair spailed and cracked concrete slabs and beams at the suspended foots vll; Appendix H Repair damaged concrete slabs with epoxy Injection and other appropriate means depending on condition, This action ls unlikely to have any appreciable impact. b. Remove anis replace roof framing Pr v11; Appendix H Remove and replace roof framing. This action is unlikely to have any appreciable impact. Replace plywood roof sheathing, utilizing great care in c: Replace plywood sheathing at roof Pr vll; Appendix H removal, storage and protection of existing clay roof tiles This action. is unlikely to have any appreciable impact, during construction: Includemiscellaneous metal and blocking as required d. Miscellaneous metal and blocking repairs All vll; Appendix 11 throughout the building in order to accomplish the work of This action is unlikely to have any appreciable impact. this phase. V. PLUM91NG'SYSTEM REPAIRS a. Sanitary waste, vent and service pipework repairs Fr VI; p. 372 Repair sanitary waste, vent and pipework. This action is unlikely to have any appreciable .impact b. Kitchen system repairs including equipment Repair and improve equipment connections and furnish connections, grease waste fittings and grease Fr vl; p. 372 required grease traps and fittings. This action is unlikely to have any appreciable .impact. interceptor C. Upgrade natural gas service including shut off Fr VI, p. 372 Install natural gas shut off valves and upgrade pipework This action is unlikely to have any appreciable impact. valves, pipework urd fittings and fittings. VI. _ HEATING, VENTILATION &'AIR CONDITIONiNG.REPAIRS e. Replace HVAC air distribution systems, zoning & All vl; p. 369 Control system for 4 -pipe Ian coil system with 4 zones for This action is unlikely to have any appreciable impact. controls entire building. W. ELECTRICAL LIGHTING, POWER & COMMUNICATION REPAIRS a' Upgrade main power and distribution breakers to Fr vI; p. 370 Upgrade main power and distribution breakers to (e) This action is unlikely to have any appreciable impact. (e) switchboard switchboard. b Upgrade machine and equipment power connections, switches, conduit and cable gr vI; p. 370 Upgrade machine and equipment power connections, switches, conduit and cable; This action is unlikely o have any appreciable impact._ c• Upgrade user convenience power receptacles including conduit and cable, spot u radcs. Fr v1 ; p.370 Upgrade user Convenience power receptacles including conduit and cable, spot upgrades, This action .is unlikely to have any appreciable impact. d. Install new lighting fixtures at upper and lower Fr A500, A501 Install new lighting fixtures at upper and lower rotunda The impact is likely to range from neutral to rotunda li htboxes G . tboxes.' positive. e Upgrade lighting control panels Fr 11; p. 370 Upgrade lighting control panels. This action is unlikely to have any appreciable impact. At Reference No., SCOPE. ITEM Zone CondttfontRepair PROCEDURE IMPACT(S) Symbol Upgrade telephone/data outlet-, including conduit vl; 370 Upgrade telephone/data outlets including conduit and and cable, spot upgrades. Fr p. cable, spot upgrades. This action is unlikely to have any appreciable impact. I THE SECRETARY'OF THE NTEF IOR'S vTANDARDS:FOR .REHABILITATION NOTES The intent of the Standards is'to assist the long-term presen'ation of a property's significauice through the preservation of historic materials and features; The Standards encompass the exterior and interior of buildings, related landscape features, and the.bE.uilding's site and environment, as well as attached, . adjacent, or related new construction. To be eligible for Federal tax incentives, a rehabilitation project must meet all ten Sfan.darids Certain treatment, if impraoperhy applied or certain materials by their physical properties, may cause or accelerate. physical deterioration of historic buildings_ Inappropriate physical treatments include, but are not limited to: impropc r repainting techniques improper exterior nmsoruy cleaning methods; or improper, introduction of insulation where damage to historic fabric would result_ In almost all situations, use of these materials and treatments %Aril] result in denial of certification: In addition, every effort'sbould be made to ensure that the new, materials and workmanship are compatible -Mth the materials. and workmanship of the historic property: DEFINITIONS (provided by the "indona/:Pruk service) PRESERVATI0N is defined as the act or process of, measures to sustain the existingforni integrity, and material of a building or structure; and existing:fonn and ,vegetative cover of a site. It map include. initial stabilization -work-, where necessary, as, well as ongoing. maintenance of the historic building materials. R EHAS I LITATI O N is defined as the act or process of returning a property to a state of utility through repair. or alteralion wbich inakes possible an efficient contemporary use while preserving those portions or features of the property which are significant to its historical. architectural, and cultural values. RESTORATION is defined as the actor pmccss of accurately recovering -the form and details of aproperty' and its setting as it a ed at a tiicular. nod of time means of the* removal of later work or the Ppm pa Pe � by by:. _ replacement. of missing earlier work.' RECONS Ruc-riorV is defined as the act orprocess:ofmproducing,by. new construction the exact form and detail of a vanished building; structure, or object, or a part thcre4 as it appear- at a specific period of time:. ;: APPENDIX C SOILS ENGINEERING REPORT SOILS ENGINEERING REPORT ATASCADERO CITY HALL SEISNHC REPAIR / RETROFIT ATASCADERO, CALIFORNIA December 10, 2004 Prepared for The City of Atascadero Prepared by Earth Systems Pacific 4378 Santa Fe Road San Luis Obispo, CA 93401 Copyright 0 2004 4378 Santa Fe Road �-Earth Systems Pacific San Luis Obispo, CA 93401-8116 T MW (805) 544-3276 • FAX (805) 544-1786 10 E-mail: esc®earthsys.com December 10, 2004 FILE NO.: SL -14351 -SA Ms. Rachelle Rickard City of Atascadero Atascadero City Hall Annex 6905 El Camino Real, Suite 6 Atascadero, CA 93422 PROJECT: ATASCADERO CITY HALL SEISMIC REPAIR / RETROFIT ATASCADERO, CALIFORNIA SUBJECT: Geotechnical Engineering Report CONTRACT REFS: 1) Consultant Services Agreement for the City of Atascadero, Earth Systems Pacific, 2004 2) Exhibit A, Proposal for Geotechnical Investigation, Atascadero City Hall, Atascadero, California, by Earth Systems Pacific, dated August 31, 2004, Doc. No. 0408-151.PRP Dear Ms. Rickard: As authorized by your execution of the referenced contract and attached proposal/exhibit, this geotechnical engineering report has been prepared for use in the development of plans, specifications, and cost estimates for the repair of Atascadero City Hall in Atascadero, California. Four copies of this report are being furnished for your use. As requested, two additional copies have been forwarded to Mr. Brent Nuttall at Nabih Youssef & Associates. We appreciate the opportunity to have provided services for this project and look forward to working with you again in the future. If there are any questions concerning this report, please i do not hesitate to contact me. Sincerely, 91tOFESSj0Nq{ I ,`�C,•��Fiy� Fyc Earth Syste ?3 2 G' rn1Exp. Dennis Sh ,G.E.I/'05 F ` y~ Date Signed: OF CAO LI Copy to: Nabih Youssef & Associates, Attn: Mr. Brent Nuttall (2) J Doc. No.: 0412-074.SER/jc ii ..I I` 4378 Santa Fe Road �- Earth Systems Pacific San Luis Obispo, CA 93401-8116 (805) 544-3276 •FAX (805) 544-1786 E-mail: esc®earthsys.com TABLE OF CONTENTS Page COVERLETTER..................•--.............................................................................. ii LGINTRODUCTION .......................................................................................1 Boring Location Map 2.0 SCOPE OF SERVICES ............................................. APPENDIX B 3.0 SITE DESCRIPTION..................................................................................3 Floor Level Survey Maps 4.0 FIELD INVESTIGATION ................................. 5.0 LABORATORY ANALYSIS ................... 6.0 FLOOR LEVEL SURVEY ...........................• --..................----......................5 7.0 GENERAL SOH- PROFILE........................................................................6 8.0 SEISMIC ANALYSIS.................................................................................6 9.0 CONCLUSIONS.............................................................-•---•--......................8 10.0 PRELB41NARY GEOTECHNICAL RECOMMENDATIONS ...............10 Foundations..........................................................................................10 Observation and Testing.........................................................:............11 11.0 CLOSURE............................................................. :..................................... 12 TECIINICAL REFERENCES...............................................................................14 iii APPENDICES �I APPENDIX A Boring Location Map Boring Logs APPENDIX B Laboratory Test Results l APPENDIX C Floor Level Survey Maps APPENDIX D Site Response Spectra iii Atascadero City Hall Seismic Repair / Retrofit December 10, 2004 1.0 INTRODUCTION �I This report has been prepared to provide geotechnical information for use in the selection and design of repair measures for the Atascadero City Hall structure in Atascadero, California. (� The building suffered considerable structural damage on December 22, 2003 during the San Simeon earthquake. The proposed repair of the building will involve the conversion of existing walls of the structure to shearwalls, construction of new foundations to support the modified walls, and possibly underpinning of the structure. The conversion of the existing walls to shearwalls will be accomplished by adding rebar and applying shotcrete to the existing walls. We understand that the walls to be converted extend through the height of the structure, and are currently supported by pad footings. The shearwalls will be about 22 feet long and will impose about 3.2 klf dead load on the soil. To support the additional weight of the shear -walls, the existing pad footings will be connected via grade beams to form new continuous footings. The foundation of the structure may also be augmented by a system of underpinning, the nature of which has not yet been determined. 2.0 SCOPE OF SERVICES The scope of work for the geotechnical report included a general site reconnaissance, . subsurface exploration, laboratory testing of selected soil samples, a floor.level survey, and geotechnical evaluation of the data collected. The report and recommendations were based on information provided by Mr. Brent Nuttall of Nabih Youssef & Associates. The report and preliminary geotechnical recommendations are intended to comply with the considerations of Sections 1804.2 through 1804.5 and 3309.5 of the 2001 California Building Code (CBC) and common soils engineering practice. The test procedures were accomplished SL -14351 -SA 1 0412-074.SER Atascadero City Hall December 10, 2004 Seismic Repair / Retrofit in general conformance with the standards noted, as modified by common geotechnical practice in this area. The preliminary geotechnical recommendations presented in this report are presented to guide the development of project plans, specifications, and cost estimates. As there may be geotechnical issues yet to be resolved, this firm should be retained to provide consultation as the design progresses and to review project plans as they near completion, to assist in verifying that pertinent geotechnical issues have been addressed and to aid in conformance with the intent of this report. It is our intent that this report be used exclusively by the client in the preparation of plans and specifications. Application beyond this intent is strictly at the user's risk. This report does not address issues in the domain of contractors such as, but not limited to, site safety, subsidence of the site due to compaction, loss of volume due to stripping of the site, shrinkage of soils during compaction, excavatability, shoring, temporary slope angles, I construction methods, etc. Analysis of areal or site geology and of the soil for corrosive potential, radioisotopes, hydrocarbons, or other chemical properties are beyond the scope of this investigation. Evaluations of mold potential or the potential for asbestos (either naturally occurring or man- made) were not part of the scope of work authorized for this project. Ancillary features such ' as grading, access roads, fences, flag and light poles, and signage . are also not within our scope and are not addressed. In the event that there are any changes in the nature, design, or location of improvements, or if any assumptions used in the preparation of this report prove to be incorrect, the preliminary conclusions and recommendations contained in this report shall not be considered valid unless the changes are reviewed and the conclusions presented in this report are verified or SL -14351 -SA 2 0412-074.SER Atascadero City Hall December 10, 2004 rr Seismic Repair / Retrofit l modified in writing. The criteria presented in this report are considered preliminary until such time as any peer review or review by any jurisdiction has been completed, conditions have been observed by the soils engineer in the field during construction, and the recommendations have been verified as appropriate or modified in writing. 3.0 SITE DESCRIPTION The site is located on the north side of Palma Avenue, extending to Lewis Avenue and spanning the -block between East Mall and West Mall. For the purposes of this report, Palma Avenue is considered to run in an east -west direction. The surrounding district is a mix of commercial, educational and public park uses. The City Hall is a three-story structure with a basement; its construction dates back several decades. It was constructed using of a variety of materials including reinforced concrete, structural steel, wood, unreinforced masonry., and terra cotta. At the time of our initial site visit, considerable damage to the building was observed. It 1� should be noted that prior to our site visit, however, crews had been working at the site, and there may have been more extensive damage to the building that was not observed by this firm. When we viewed the interior of the structure all furniture and equipment had been removed from the upper floors, and much of it was being stored in the basement. Our ability to view conditions in the basement was therefore somewhat impeded; p , however, a hump in the basement slab was apparent, as were numerous cracks in the concrete basement -floor and the walls. The walls of the upper floors exhibited numerous cracks, and several of the doorways and windows appeared to be wracked. A fireplace was severely damaged, with I. cracks throughout the masonry my and the loss or displacement of many of the bricks. The tops of some columns were also damaged; it is unknown whether the damaged elements were structural or decorative. SL -14351 -SA 3 0412-074.SER ri®r-WOR Atascadero City Hall December 10, 2004 Seismic Repair / Retrofit The question had been raised as to how much of the building damage was due to the San Simeon earthquake, and how much existed before the earthquake. Mr. Nuttall indicated that _ an effort had been made to locate records of the building's condition prior to the earthquake, but that none had been found. We did contact a local structural engineer, Mr. Fred Schott of Schott & Associates, who indicated that he had been involved in three projects at the City Hall between 1988 and 1991. He recalled that at that time, there was some indication of minor long-term settlement and differential settlement. He saw no evidence to indicate that the settlement was ongoing. No repair was considered necessary or recommended at that time, however, he did recommend that the cracks be catalogued and that a liquid -level survey be performed. He had no knowledge of such surveys being completed. 4.0 FIELD INVESTIGATION I�To assess subsurface conditions and retrieve soil samples, four exploratory borings were drilled at the site on October 6, 2004. The borings were drilled using a truck -mounted Mobile Drill rig, Model B-53, equipped with an 8 -inch outside diameter hollowstem auger. The borings ranged in depth from approximately 26.5 feet to 51.5. feet below the existing ground surface. The approximate locations of the borings are shown on the Boring Location Map in Appendix A. Soils encountered in the borings were categorized and logged in general accordance with the Unified Soil Classification System and ASTM D'2488-00. Copies of the boring logs can also be found in Appendix A. Soil samples were taken using a ring -lined barrel sampler (ASTM D 3550-01, with shoe similar to D 2937-00). Standard penetration tests were also conducted. at selected depths in the borings (ASTM D 1586-99). Bulk soil samples were obtained from the auger cuttings. SL -14351 -SA 4 0412-074.SER iSk,r. QW1 W Atascadero City Hall December 10, 2004 Seismic Repair / Retrofit 5.0 LABORATORY ANALYSIS The ring samples were tested for unit weight and moisture (ASTM D 2937-00, as modified for ring liners). Grain size analysis was performed on four samples (ASTM D 422-02) to verify soil classifications. One bulk sample was tested for maximum density and optimum moisture (ASTM D 1557-02), and expansion index (ASTM D 4829-03). Three consolidation tests (ASTM D 2435-02) were performed on selected ring samples. Direct shear tests �I (ASTM D3080-03) were performed on a ring sample and a sample remolded to . approximately 90 percent of maximum dry density. Results of the laboratory tests are j....� presented in Appendix B- 6.0 FLOOR LEVEL SURVEY In November 2004, representatives of this firm performed floor level surveys of the basement and the first floor. Please seethe Floor Level Survey Maps in Appendix C. While a hump in the basement slab had been noted, little meaningful data could be developed for the basement level as.there are a number of different floor levels, some floors slope toward drains, and some areas are dirt floor. The survey of the first floor revealed that the east and northeast regions are up to 2.9 inches higher than the datum (near the center of the building), and that the west wing is up to 3.9 I" I inches lower than the datum. These data indicate a maximum difference of 6.8 inches across the building. It is likely that even the' higher areas settled to some degree during the earthquake; perhaps a small fraction of an inch, with the west region settling over 7 inches.. The settlement was quite nonuniform, with some adjacent points showing no difference in elevation, and other adjacent points showing up to 3.3 inches of difference. Please note that the levels were adjusted to account for slightly different thicknesses of floor coverings. In doing so, the levels of adjacent two points, one on each type of floor covering, SL -14351 -SA 5 0412-074.SER Atascadero City Hall December 10, 2004 Seismic Repair / Retrofit were recorded and the difference in level noted. This difference was then added to or subtracted from, all elevations on that particular floor covering to normalize that area to the datum. Due to these adjustments, in several locations, identical levels are shown for points that are very close to one another, but on the opposite sides of door thresholds. I' 7.0 GENERAL SOIL PROFILE In the four locations drilled, the upper soil was sandy silt. It was brown to dark brown, and f I I in some borings, contained gravel to 1 inch in diameter. Conditions were medium stiff to i very stiff. In Boring 1, the sandy silt was underlain at a depth of 15 feet by medium -dense, poorly graded gravel with silt and sand. At 20 feet, a transition to soft sandy silt occurred. The boring was terminated at a depth of 26.5 feet with no further changes occurring. In Borings 2 and 3, the upper sandy silt was underlain by stiff, brown to dark brown sandy lean clay. In Boring 2, medium -stiff sandy silt was found at a depth of 11 feet; it became soft at a depth of 24.5 feet. In Boring 3, the sandy lean clay continued throughout the termination depth of the boring at 26.5 feet; however; conditions became medium stiff at 19.5 feet and soft at 23.5 feet. In Boring 4, dark brown sandy silt was encountered to a depth of 28.5 feet. iIt was medium stiff to stiff in the upper layers, and -became soft at a depth of 20 feet. It was underlain by silty gravel and silty clayey sand at depths of 28.5 and 30 feet, respectively. Conditions were loose. At 40 feet, a transition to loose silty sand occurred, and at 50 feet, silty gravel with sand was encountered. The boring was terminated at 51.5 feet. At the time of drilling, the upper soils were moist to very moist. Free subsurface water was encountered in all of the borings at depths of 23.5 to 28.5 feet.. 8.0 SEISMIC ANALYSIS To characterize the seismicity at the site, a Probabilistic Seismic Hazard Analysis (PSHA) was performed using the FRISKSP computer program (Blake, 2000) to determine the. I SL -14351 -SA 6 0412-074.SER ®r -WOR; Atascadero City Hall December 10, 2004 Seismic Repair / Retrofit parameters of the Design Basis Earthquake (DBE). This earthquake is defined as having a 10 percent chance of exceedance in 50 years with a return period of approximately 475 years. To develop the DBE, significant mapped faults within a radius of 65 miles from the site were selected from the program database. The most significant earthquake would be of moment magnitude 7.8 on the Rinconada fault, which Iies only 3 km to the northeast. The peak horizontal ground acceleration and spectral accelerations at 5% damped, for a CBC "SD" and NEHRP "D" soil type (FEMA 1994), were estimated using the Boore and others (1997) method. The results of the analysis indicate that the DBE for the site is estimated to have a peak spectral acceleration of 0.68g at a 0.3 second natural site period and a peak horizontal ground acceleration of 033g. Please see the Site Response Spectra in Appendix D. To assess the potential for liquefaction, the moment magnitude and peak horizontal ground acceleration discussed above were used, together with standard penetration data from the boring logs. The term "liquefaction" refers to the liquefied condition and subsequent loss of soil strength that can occur in soils when they are subjected to a sudden shock, such as that generated during an earthquake. The analytical method proposed by Youd and Idriss (2001) was used. Our analysis indicated that liquefaction could occur from the groundwater to a depth of about 50 feet. The groundwater could rise somewhat, and if it were higher during an earthquake, up to 30 feet of liquefied soil could result. Dynamic settlement was analyzed using the method of H.B. Seed et al (1987). Calculations show that under a liquefaction -producing earthquake, maximum dynamic settlement could be about 6 to 7 inches, however, in our opinion, the accepted methods tend to slightly overestimate settlement; our judgment is that 4 to 6 inches is more likely since up to 7 inches SL -14351 -SA 7 0412-074.SER Atascadero City Hall Seismic Repair/ Retrofit December 10, 2004 has already occurred at the site (see previous discussion of floor level survey). Differential dynamic settlement is likely to be about'h'of the maximum settlement. _ 9.0 CONCLUSIONS The results of the floor level survey indicate that significant settlement of the structure has. occurred, with the western portion of the building probably having settled over 7 inches. Considerable damage to the structure is evident in the cracks, damaged masonry, and wracking of doors and windows. Although no records appear to be available as to the condition of the building prior to the earthquake, based upon a personal communication with structural engineer Fred Schott and the results of our analysis, it is likely that most of the settlement and differential settlement are the result of the San Simeon earthquake. To support the new shearwalls, it is recommended that grade beams be used to connect existing spread footings; this will, in effect, create continuous grade beam/footings beneath the shearwalls. To limit differential settlement between the new walls and the existing If- structure under static conditions, and throughout -the structure in the event of a liquefaction - producing earthquake, grade beams could be installed to make the whole building foundation f 1 function as an integral unit, to the degree practicable. The new grade beam/footings should be doweled into existing footings and attached to other parts of the structure, as practicable, to further reduce the potential for differential settlement. I If further protection from settlement is desired, the building could be underpinned. IUnderpinning the building to bear in rock would probably be necessary from a geotechnical standpoint. No rock was encountered in the borings drilled for the project, although one boring extended to a depth of 51.5 feet. Borings drilled by this firm for the Lewis Avenue Bridge, proposed to be constructed nearby, encountered rock at a depth of about 65 feet. II t SL -14351 -SA 8 0412-074.SER Atascadero City Hall Seismic Repair/ Retrofit December 10, 2004 Options for underpinning could include driven piles, helical piers, or drilled caissons. Driving piles would induce some vibration and would only be suitable if the building were well retrofitted before the driving process, or if damage was acceptable and would be fixed after the piles were driven. It would not be practicable to drive piles inside the structure, so I__ I reasonably, this option would only be suitable to support the perimeter of the building where the work could be done from the outside. Steel H -piles would probably be appropriate; they could be up to 100 -ton capacity. They would probably be driven to a depth of 75 to. 85 feet to attain this capacity, assuming a bedrock depth of about 65 to 75 feet. Helical piers could probably be installed to bear in the upper few feet of the bedrock. High strength piers would be necessary to reach the required bearing depth and to have the rigidity to support reasonable loads at this length without buckling. It is our understanding that helical piers are currently available with capacities of up to about 100 kips. �. Based upon the conditions at the site, it is likely that drilled caissons would be the most appropriate choice. Like driven piles, they would bear in the bedrock. Their minimum diameters would need to be 24 inches; however, 30 to 36 inches would be easier to construct. at the depth required. A skin friction capacity of 2,000 to 3,000 psf (between the concrete I.. and the rock) should be assumed for preliminary cost estimating purposes. If underpinning is pursued, additional borings should be drilled to define the depth and consistency of the bedrock, and specific underpinning recommendations should be prepared based upon the conditions encountered. SL -14351 -SA 9 0412-074.SER Atascadero City Hall Seismic Repair / Retrofit December 10, 2004 10.0 PRELMNARY GEOTECHNICAL RECOM ENDATIONS Foundations 1. Grade beam/footings constructed to support the new shearwalls should be designed using a maximum allowable bearing capacity of 1,200 psf dead load and 1,800 dead plus any live load. Under these loads, and assuming that the wall is free to settle in an unrestrained manner, maximum long-term settlement of about I/2 inch is anticipated. There could be about '/2 this much settlement between one end of the footing and the other. However, if. the wall and/or grade beam/footing is doweled into existing footings and/or is attached to other parts of the structure such that it is not free to settle as an unrestrained member, less settlement would occur. 2. The grade beam/footings should be reinforced in accordance with the requirements of the architect/engineer. I . 3. The allowable bearing capacity recommended is very conservative, as the objective is to limit differential settlement between the new walls and the existing structure. Consequently, use of more than the typical 1/3 increase for wind and seismic capacity is I appropriate. We recommend that 3,000 psf be used when wind and seismic loads are included. This would have a factor of safety of 1.5 or greater for these short-term loads. 4. The Soil Profile Type under the CBC would be SD, which corresponds to a Soil Profile Type D under FEMA / NEHRP guidelines. The following are the recommended seismic parameters: I I SL -14351 -SA 10 0412-074.SER Atascadero City Hall Seismic Repair / Retrofit Seismic Source I Distance to Seismic Source Seismic Zone Seismic Zone Factor (CBC Table 16-I) Seismic Source Type (CBC Table 16-L1) Soil Profile Type (CBC Table 16-J) Seismic Coefficient -Ca (CBC Table 16-Q) Seismic Coefficient -C„ (CBC Table 16=R) Near Source Factor -Na (CBC Table 16-S) II Near Source Factor -N,, (CBC Table 16-T) December 10, 2004 Rinconada Fault 3.0 km 4 0.40 B SD 0.53 0.96 1.3 1.5 5. Lateral resistance to seismic loads should be based upon passive resistance of 270 pcf and a friction coefficient of 0.30. 6. Footing excavations should be observed by this firm during excavation and prior to placement of reinforcing steel or concrete. Soil in footing excavations should be. moistened to at least optimum moisture content prior to concrete placement. Observation and Testing i 1. It must be recognized that the recommendations contained in this report are based on a limited number of borings and rely on continuity of the subsurface conditions encountered. 2. As there are geotechnical issues yet to be resolved, this firm should be retained to provide consultation during the design phase, to review plans as they near completion, to interpret this report during construction, and to provide construction monitoring in the form of testing and observation. i SL -14351 -SA 11 0412-074.SER Atascadero City Hall Seismic Repair/ Retrofit December 10, 2004 3. At a minimum, the following items should be reviewed, tested, or observed by this firm: • Final plans • Foundation excavations 4. A program of quality control should be developed prior to beginning construction. The owner, contractor, or project manager should determine any additional inspection items required by the architect/engineer or the governing jurisdiction. 5. A preconstruction conference between a representative of the . owner, this firm, the architect/engineer, and contractors should be convened to discuss planned construction procedures and quality control requirements. This firm should be notified at least 48 hours prior to beginning grading operations. 11.0 CLOSURE Our intent was to perform the investigation in a manner consistent with the level of care and skill ordinarily exercised by members of the profession currently practicing in the locality of this project under similar conditions. No representation, warranty, or guarantee is either expressed or implied. This report is intended for the exclusive use by the client as discussed in the "Scope of Services" section. Application beyond the stated intent is strictly at the user's risk. This report is valid for conditions as they exist at this time for the type of project described ' herein. The conclusions and recommendations contained in this report could be rendered invalid, either in whole or in part, due to changes in building codes, regulations, standards of geotechnical or construction practice, changes in physical conditions, or the broadening of -knowledge. SL -14351 -SA 12 0412-074.SER I Atascadero City Hall December 10, 2004 Seismic Repair / Retrofit If changes with respect to project type or concept become necessary, if items not addressed in this report are incorporated into plans, or if any of the assumptions used in the preparation of this report are not correct, this firm shall be notified for modifications to this report. Any items not specifically addressed in this report should comply with the CBC and the requirements of the governing jurisdiction. The preliminary recommendations of this report are based upon the geotechnical conditions encountered at the site, and may be augmented by additional requirements of the architect/engineer, or by additional recommendations provided by this firm based on peer or jurisdiction reviews, or conditions exposed at the time of construction This document, the data, conclusions, and recommendations contained herein are the property of Earth Systems Pacific. This report shall be used in its entirety, with no individual sections reproduced or used out of context. Copies may be made only by Earth Systems Pacific, the client, and the client's authorized agents for use exclusively on the subject project. Any other use is subject to federal copyright laws and the written approval of Earth Systems Pacific. Thank you for this opportunity to have been of service. If you have any questions, please feel free to contact this office at your convenience. End of Text. SL -14351 -SA 13 0412-074.SER L ..I i Atascadero City Hall rr Seismic Repair / Retrofit December 10, 2004 Technical References, Blake, T. F., FRISKSP (Version 4): A Computer Program for the Probabilistic Estimation of Peak Acceleration and Uniform Hazard Spectra Using 3-D Faults as Earthquake Sources, User's Manual 2000. I.. .I Boore, D. M., and W.B. Joyner, "Estimating Response Spectra and Peak Accelerations from Western North American Earthquakes: A Summary of Recent Work," Seismology ( Research Letters, 68-1, January -February 1997. I. Federal Emergency Management Agency (FEMA), Building Seismic Safety Council, I NEHRP Recommended Provisions for Seismic Regulations for New Buildings, 1994 Edition Seed, H.B., "Design Problems in Soil Liquefaction," Journal of Geotechnical Engineering," ASCE; 118(8),827-845,1987. Youd, T. L., and I. M. Idriss, Liquefaction Resistance of Soils: Summary Report from the 1996 and 1998 NCEER/NSF Workshops on Evalati077 of Liquefaction of Soils, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 127, .No. 4, 2001. SL -14351 -SA 14 0412-074.SER