Fountaingrove Environmental Impact Report - City of Santa Rosa ...

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4.0 MITIGATION MONITORING AND REPORTING PROGRAM TABLE 4-1 Mitigation Monitoring and Reporting Program Documentation Additional Permit Enforcement Implementation Schedule Impacts Mitigation Measures Responsible Party of regrading slopes, providing surface and subsurface drainages, and constructing slope strengthening elements such as toe buttresses and secant walls. The results of these studies may limit the proposed development design, and they will be incorporated into the design of Project components prior to approval of the Improvement Plan. If the studies result in a significant redesign of the Project, then recirculation of the EIR may be required. review of the Giblin analysis by Kleinfelder concluded that the analysis was acceptable for a preliminary evaluation and for assessing overall geotechnical feasibility of landslide mitigation and project development. Supplemental recommendations for site preparation, grading and foundation design criteria should be provided based on the results of additional site exploration and analysis of the conditions encountered. N/A Design-level Geologic and Geotechnical Investigation Report. During development of plans and specifications. City of Santa Rosa Department of Community Development Mitigation Measure 3.6-4: Incorporate the results of geologic and geotechnical investigations and site-specific seismic analysis into Project design. Impact 3.6-4: The Project could result in exposure of people or structures to loss, injury, or death due to liquefaction and other forms of seismic-induced ground failure, including seismic slope instability and ground cracking. Revised plans and specifications. Prior to approval of the Improvement Plan. As part of a design-level geologic and geotechnical investigations, site-specific seismic and geologic hazard analyses will be performed to collect data and to assess the potential for seismic-induced ground failure in soil and rock materials adjacent to and underlying Project components. The study will include assessments of seismic-induced geologic hazard potential at the project site, such as liquefaction, slope failure during earthquakes, and loss of bearing capacity of foundation soils. If such potentially problematic soils and/or slopes are found, the effects of these seismic-induced geologic hazards to the performance of Project components will be evaluated and incorporated into the design. Seismic-induced ground failure has the potential to distress, displace, and/or destroy Project buildings and facilities. Portions of the Project site that are susceptible to slope instability hazards may also be susceptible to slope failure as a result of strong seismic ground shaking. Prior to issuance of building permits. Mitigation measures may include excavation of potentially liquefiable soils during construction and replacement with engineered backfill, in situ ground treatment (such as compaction grouting, deep soil mixing, and jet grouting) to prevent occurrence of liquefaction and loss of soil bearing, construction of perimeter system to contain the problematic soils, and strengthening slopes using toe buttresses and secant walls. Potential slope failure within and outside the boundaries of the proposed development site that may impact Project components will be assessed. Portions of the Project site that are susceptible to slope instability hazards are likely to be susceptible to slope failure as a result of strong seismic ground shaking. The results of these studies may limit the proposed development design, and they will be incorporated into the design of Project components prior to approval of the Improvement Plan. If the studies result in a significant redesign of the Project, then recirculation of the EIR may be required. Impact 3.6-5: The Project may include development on soft, loose, expansive, and/or Mitigation Measure 3.6-5: Develop appropriate design City of Santa During N/A Design-level Geologic and Geotechnical compressible soils that creates substantial risks to life or property. features for locations where potential problems have Rosa development of Investigation Report. been identified through design-level geotechnical Department of plans and Soft or loose soils may affect support of structures and excavations. Shrink/swell, or investigations. Community specifications Revised plans and specifications. expansive-soil, behavior is a condition in which soil reacts to changes in moisture content by Development expanding or contracting. Much of the existing fill identified within the Project site has high Design-level geotechnical studies will be conducted to Before thePrior clay contents with moderate expansion potential. Expansive soils may cause differential and develop appropriate design features for locations where Project Applicant to approval of cyclical foundation movements that can cause damage and/or distress to overlying structures potential problems are known to exist. If potentially the Improvement and equipment. Potential impacts from loose sands, soft clays, and other potentially problematic soils are found, appropriate design measures Plan. compressible soils include excessive settlement and low foundation-bearing capacity for may include excavation of such soils during construction Project buildings and facilities. and replacement with engineered backfill, ground Prior to issuance of building 4-10 ES092008001PHX\ BAO\082970001
4.0 MITIGATION MONITORING AND REPORTING PROGRAM TABLE 4-1 Mitigation Monitoring and Reporting Program Documentation Additional Permit Enforcement Implementation Schedule Impacts Mitigation Measures Responsible Party permits. treatment processes, redirection of surface water and drainage away from foundation soils, and the use of deeper foundations. If expansive soils are found, covering them with a moisture-conforming and protecting blanket of approved onsite or imported materials of low expansion potential can reduce shrink/swell behavior. Implementation of these standard engineering methods would reduce potential impacts to a less-than-significant level. If the studies result in a significant redesign of the Project, then recirculation of the EIR may be required. N/A Slope Stability Analysis Report. Impact 3.6-6: The Project could result in exposure of construction workers or equipment to loss, injury, or death due to excavation instability. Design-level Geologic and Geotechnical Investigation Report. During development of plans and specifications. City of Santa Rosa Department of Community Development Mitigation Measure 3.6-6: Evaluate subsurface conditions and analyze excavation and grading slopes for stability and incorporate recommendations into grading plans and construction operation activities. Revised grading plans and specifications. Project Applicant Regular construction monitoring logs, monthly summary report. Prior to the approval of the Improvement Plan. Construction Site Monitor Temporary construction slopes and existing natural or constructed slopes impacted by construction operations will be evaluated for stability. In developing grading plans and construction procedures, the stability of both temporary and permanent cut, fill, and otherwise impacted slopes will be analyzed. Construction slopes and grading plans will be designed to limit the potential for slope instability, maintain adequate drainage of improved areas, and minimize the potential for erosion and flooding during construction. During construction, slopes affected by construction operations will be monitored and maintained in a stable condition. Construction activities likely to result in slope or excavation instability will be suspended during and immediately following periods of heavy precipitation when slopes are more susceptible to failure. Destabilization of natural or constructed slopes could occur as a result of construction activities. Excavation, grading, and fill operations could alter existing slope profiles and could result in the excavation of slope-supporting material, steepening of the slope, or increased loading. Excavation operations during construction of the Project could result in unstable excavation slopes, caving, and displacement of the adjacent ground surface. However, as discussed below, appropriate design features and construction procedures would be implemented to maintain stable slopes and excavations during construction. During Construction. Appropriate construction methods and procedures, in accordance with state and federal health and safety codes, will be followed to protect the safety of workers and the public during trenching and excavation operations. A design-level geotechnical investigation will be performed to evaluate subsurface conditions, identify potential hazards, and provide information for development of excavation plans and procedures. If the studies result in a significant redesign of the Project, then recirculation of the EIR may be required. 3.7 Hazards and Hazardous Materials Site Health and Safety Plan. California Occupational Safety and Health Administration, California Department of Transportation, and the Sonoma County Hazardous Materials and Waste Management Plan requirements. Before development of plans and specifications. City of Santa Rosa Department of Community Development Mitigation Measure 3.7-1: Comply with all applicable State and local regulations for hazardous materials and waste management. Impact 3.7-1: Construction and operation of the Project would require the use and transport of some hazardous materials. Project Applicant Hazardous materials impacts from construction and operation of the site would not be significant with regulatory compliance. The construction of the facility would require the transport, temporary storage, and use of asphalt, fuels, paints, and solvents, which could potentially be released and result in exposure to these chemicals. Operation of the facility could also involve the use of household and janitorial cleaning products, pesticides, herbicides, and solvents. The use and handling of materials associated with the construction and operation of the proposed Fountaingrove Lodge facility would follow all applicable federal, state, and local regulations, including California Occupational Safety and Health Administration, California Department of Transportation, and the Sonoma County Hazardous Materials and Waste Management Plan requirements. Waste would be disposed through the municipal waste water or solid waste services. ES092008001PHX\ BAO\082970001 4-11
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Aegis Senior Living Continuing Care
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CONTENTS Response to Comment Letter
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ACRONYMS AND ABBREVIATIONS HFC hydr
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1.0 INTRODUCTION were accepted. A p
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2.0 List of Commenters and Response
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2.0 LIST OF COMMENTERS AND RESPONSE
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28) Comment noted. 2.0 LIST OF COMM
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Page 179 and 180: 2.0 LIST OF COMMENTERS AND RESPONSE
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Page 189: Executive Summary Project The Aegis
Page 193: Mendocino £¤ 101 0 ± 5 10 Miles
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Page 202 and 203: 3.6 GEOLOGY, SOILS, AND SEISMICITY
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