ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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The following mitigation measures are provided for significant and potentially significant impacts: Mitigation Measure 4.7-2: Risks to People and Structures Caused by Strong Seismic-Related Ground Failure. a. Before contract bidding for project construction,the approved project design plans and specifications, including grading and foundation plans, shall be reviewed by a soils engineer approved by the City. This review shall be completed to assess whether the recommendations in project geotechnical reports prepared by Kleinfelder are sufficient for construction of the buildings and facilities described in the final project design plans. If these measures are deemed insufficient,the geotechnical engineer shall prepare supplemental site- specific geotechnical report(s)with appropriate recommendations sufficient to ensure the safety of project structures and site occupants. These measures could include,but are not limited to,the construction of deep foundations,installation of driven piles, and extra reinforcement of foundation slabs. At a minimum,these measures shall demonstrate that the proposed project design would meet CBC and City design standards. b. During project design and construction, all measures outlined in project geotechnical reports for the proposed project and, if necessary,measures included in the supplemental site-specific geotechnical report(s) shall be implemented to ensure that project structures and site occupants would be safe during seismic events. c. The on-site soils will likely be saturated by rainfall in the winter and early spring months. If the construction schedule requires continued work during the wet months,the City shall consult with a qualified civil engineer and implement any additional recommendations provided, as conditions warrant. Mitigation Measure 4.7-3: Construction-Related Erosion Hazards. ► A grading and erosion control plan shall be prepared by a California Registered Civil Engineer prior to issuance of any grading permits. The plan shall be consistent with the CBC grading requirements and shall include the site-specific grading required for new construction. The City shall ensure that the construction contractor is responsible for securing a source of transportation and deposition of excavated materials. ► BMPs for erosion and siltation prevention, as further described in Section 4.9, "Hydrology and Water Quality,"of this Draft EIR,will be implemented at proposed project areas during all construction activities. The City will consult with the Central Valley Regional Water Quality Control Board to acquire the appropriate regulatory approvals that may be necessary to obtain Section 401 water quality certification, State Water Board statewide NPDES stormwater permit for general construction activity, and any other necessary site-specific waste discharge requirements(WDRs) or waivers. As required under the NPDES stormwater permit for general construction activity,the City will prepare and submit the appropriate Notice of Intent (NOI)and prepare the SWPPP and any other necessary engineering plans and specifications for pollution prevention and control. The SWPPP and other appropriate plans shall identify and specify the use of erosion and sediment control BMPs, means of waste disposal, implementation of approved local plans,non- stormwater management controls,permanent post-construction BMPs, and inspection and maintenance responsibilities. BMPs will include dust control measures such as wetting the top layer of exposed soils and covering soil stockpiles, as necessary. ► The SWPPP would also specify the pollutants that are likely to be used during construction that could be present in stormwater drainage and non-stormwater discharges. A sampling and monitoring program would be included in the SWPPP that meets the requirements of State Water Board Order 99-08-DWQ to ensure that the BMPs are effective. ► Prior to issuance of any grading permits, construction techniques will be identified that would reduce the potential for runoff, and the plan shall identify the erosion and sedimentation control measures to be implemented. The SWPPP shall also specify spill prevention and contingency measures, identify the types of materials used for equipment operation, and identify measures to prevent or clean up spills of hazardous materials used for equipment operation and hazardous waste. Emergency procedures for responding to spills Manteca WQCF and Collection System Master Plans EIR EDAW City of Manteca 4-7.21 Geology,Soils,and Seismicity