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Shaw Environmental, Inc. A V'Yo r- I d cif �i o I u i i o i j ;- December 22, 2009 Project No. 136605 W. Michael Carroll, PE Senior Civil Engineer, Solid Waste Division County of San Joaquin Department of Public Works 18 10 E. Hazelton Avenue Stockton, CA 95205 Re: Revised Response to Department of Water Resources Coninients Dear Mr. CaIT011: This letter provides revised responses to comments by Mike Driller of the Calilornia Department of Water Resources (DWR). presented in a letter dated July 14, 2009. The commentsp ertain to the slope stability analyses contained in the report entitled, "30 Percent Design Report for Vertical Expansion of the North County Recycling Center and Sanitary LajidfilL" (Shaw Environmental, Inc., December 2007). The referenced design report iticluded a slope stability amalysis, as Appendix E, for the proposed vertical expansion of the landfill to elevation 320 feet mean sea level (N/lSL). The DWR comments were included with Iri a letter from the (,allfonlia lZeglolial Water Ouality Control Board (IZWQCB'), Central Valley [Zegioii dated ,lupi 14, 2009. (DWR's comments are in bold, followed by the response). Shaw Enviroiiinejifal, Inc. originally responded to the DWR comments in a letter dated August 27, 2009. A mectinoZ-- was lield on AL1gLISt 31, 2009 with San Joaquin County, Shaw, RWQCB, and DWR I staff to discuss the responses. As a result of that meeting, Shaw was asked to address several additional action Items to clarify and expand several of our original -responses. Subsequently, another meeting wits held on November 24. 2009 with San Joaquin County. Shaw, DWR,, and RWQCB staff. This revised response letter addresses the original comments and the additional action items agreed to during the August 31, 2009 and November 24, 2009 meetings. Foundation Soils The foutidation is comprised of niedium dense silty sands and elayey sands. The fol ndation,soils, as described, shoe provide a suitable base for the landfill. The conu-nent is correct; no response is necessary. Configuration The landfill has 3:1 excavation slopes and 3:1 exterior slopes with 20 -foot wide benches every 50 feet vertically. The landfill is currently permitted to 190 feet above mean sea level (nisl). The bottom of the excavation varies but appears to be behveen 60 and 70 feet ms]. Based on that, the NkCIAAMERCIABACTIVE PROJEGTSISAN JOAUMN EXP 81.01PE STAWLITY RESPONSBRESPON8E LEI TE RiREVISED:FINAL RE V I S E 0, R G§P, QbLq L 9 R4 .......... --------- — — .......... . . . , 1326 NORTH MARKET BOULEVARD, SACRAMENTO, CA 95834-1912 - 916.928.3300 - FAX 916,565.4356