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III. ENVIRONMENTAL SETTING IMPACTS AND MITIGATION MEASURES F. HYDROLOGY AND WATER QUALITY ® people Expose or structures t i p p p o a significant risk of loss, injury or death involving flooding. IMPACT STATEMENTS AND MITIGATION MEASURES Impact F.1: The proposed project would create additional nonpoint source pollution that may enter stormwater runoff and be discharged from the site during construction activities. (Significant) The project construction activities would expose bare soil and potentially generate other water quality pollutants that could be exposed to precipitation and subsequent entrainment in surface runoff. Construction activities involving soil disturbance, excavation,cutting/filling, stockpiling, and grading activities could result in increased erosion and sedimentation to surface waters. Construction materials such as asphalt, concrete, and equipment fluids could be exposed to precipitation and subsequent runoff. If precautions are not taken to contain contaminants, construction could produce contaminated stormwater runoff(nonpoint source pollution),a major contributor to the degradation of water quality. Mitigation Measures Proposed as Part of the Project None. Mitigation Measures Identified in This Report Mitigation Measure F.1: Since the project construction would cover an area greater than five acres,a Storm Water Pollution Prevention Plan would be developed as required by the Regional Board under the NPDES General Permit for Discharges of Storm Water Associated with Construction Activity. Prior to the start of construction, a SWPPP shall be prepared to address water quality impacts associated with construction of project facilities and roadways. The project sponsor shall incorporate into contract specifications the requirement that the contractor complies with and implements the provisions of the SWPPP. The objectives of the SWPPP are to identify pollutant sources that could affect the quality of stormwater discharge, to implement control practices to reduce pollutants in stormwater discharges, and to protect receiving water quality. Significance after Mitigation: Less than Significant. Impact F.2: The proposed project would create additional nonpoint source pollution that may enter stormwater runoff and be discharged from the site during operation of the proposed facilities. (Significant) The increased level of activity and increased quantities of waste handled at the site under the proposed project would increase available pollutants that may enter surface runoff during storm events. Areas uncovered as part of the site operation would see greater use and would likely collect increased pollutants. Increased dust, litter, vehicle pollutants, residual waste, and the proposed green waste recycling area would provide increased sources of nonpoint source pollution that would be available to surface runoff. Stockton Scavenger Transfer Station Erpansion III.F.6 ESA 1990190