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California Tonal Water Quality Conte 'Board <br />Central Valley Region °I <br />Robert Schneider, Chair <br />Linda S. Adams Arnold <br />Secreta or Sacramento Main Office RECt <br />�—;arzenegger <br />Environmental 11020 Sun Center Drive #200, Rancho Cordova. California 95670-6114 ICc Governor <br />Protection Phone (916) 464-3291 • FAX (916) 464-4645 <br />http://www.waterboards.ca.gov/centralvallev <br />4 December 2006 <br />Ms. Claudia Gemberling <br />San Joaquin County <br />1810 East Hazelton Avenue <br />Stockton, California 95205 <br />r <br />REVIEW OF DRAFT ENVIRONMENTAL IMPACT REPORT FOR NORTH COUNTY <br />RECYCLING CENTER AND SANITARY LANDFILL, SAN JOAQUIN COUNTY. <br />The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br />Draft Environmental Impact Report (DEIR) for North County Recycling Center and Sanitary <br />Landfill (NCRCSL). The purpose of the DEIR is to inform agencies and the public of the <br />potential significant environmental effects of the proposed project, minimize the significant <br />effects, and describe alternatives to the project that will avoid or reduce potentially significant <br />effects. <br />The Regional Water Board is concerned with the potential degradation of groundwater and <br />surface water quality as a result of the proposed vertical expansion of NCRCSL. The DEIR <br />was prepared using existing information found in the Joint Technical Document (JTD) <br />submitted to the Regional Water Board as required under California Code of Regulations <br />(CCR) Title 27, Section 21585. The JTD was revised in March 2005 when the proposed fill <br />height was identified but not analyzed by San Joaquin County. <br />Regional Water Board staff cannot support this project as proposed at this time. Staff will <br />require the following to support the proposed project: <br />A minimum 30% design for storm water drainage and erosion control measures <br />required for the proposed units and height increase; <br />2. A minimum 30% design of the proposed liner system. The proposed liner system will <br />incorporate a geomembrane and geocomposite clay liner (GCL). <br />3. A minimum 30% design of the LCRS system. Based upon a review of the Pipe Loading <br />Calculations, the LCRS system will be constructed with schedule 120 Polyvinyl chloride <br />(PVC) piping that will have to support the maximum waste height of 370 feet. <br />4. Although the Slope Stability Analyses is conceptual in approach and yields Factors of <br />Safety of 1.54 and 1.57 for cross-section AA and BB, the analyses addressed only the <br />global slope stability of the landfill. As discussed in the DEIR, as detailed design <br />information becomes available, slope stability studies will require refinement and further <br />California Environmental Protection Agency <br />Cl Recycled Paper <br />