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'1 t, MOUNTAIN HOUSE NEIGHBORHOODS KAND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST d 7.HAZARDS t � I C-' Construction activities and the transportation of hazardous materials would be subject to federal, state,and local laws and requirements designed to minimize and avoid the potential health and safety risks associated with hazardous materials. The project applicant would be required to submit a Stormwater Pollution Prevention Plan(SWPPP)to obtain coverage under the National Pollutant Discharge Elimination System (NPDES)construction general permit. The SWPPP must include measures to protect against the accidental release of construction-related chemicals. Adherence to regulatory requirements for construction activities and hazardous materials use,transportation, and disposal would ensure that impacts during project construction would be less than significant. i ! R After project construction, minor amounts of hazardous materials would likely be used in residences and commercial businesses, and for maintenance of park areas; the latter would be subject to federal, state, and local laws and requirements. The use of minor amounts of hazardous materials in residences and commercial businesses and during park maintenance activities would not result in a significant impact related to hazardous materials. No mitigation measures are necessary. b) Would the project create a significant hazard to the public or the environment through reasonably foreseeable upset and accident i conditions involving the release of hazardous materials into the environment? PCBs. Verification by PG&E that any on-site transformers do not contain PCBs is a condition of project approval. If PCB-containing material is found, proper disposal and the replacement of the existing transformers with non-PCB- r_. containing transformers would be necessary. This is standard practice for t PG&E. Agricultural Chemicals. The Neighborhoods K and L sites have been in F1 agricultural production since the early 1900s.The potential contaminant levels and associated human health risks associated with the use of agricultural chemicals, primarily pesticides and herbicides, in Neighborhoods K and L were F1assessed in the Limited Phase II ESA for these neighborhoods. No pesticides or herbicides were detected in soil samples collected at Neighborhood K.Very low levels of DDT and DDE were detected in two soil samples collected at Neighborhood L. Based on the results of a human health risk screening evaluation,the detected residual concentrations of DDE and DDT do not appear to contribute to a potential hazard to public health or the environment(Condor, 2004b). F � Storage Tanks/Soil Contamination in Neighborhood L. One 20-gallon gasoline or diesel fuel AST was observed near the former small garage located at the southeastern corner of Neighborhood L during the site reconnaissance performed as part of the Phase I ESA in 2004. There are no documented (gull ) 5-97 Fj