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Cali rnia gional Water Quality Co oard - <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secretary for Sacramento Main Office Schwarzenegger <br /> Environmental 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone(916)464-3291 -FAX(916)464-4645 <br /> http://www.waterboards.ca.gov/centralvalley <br /> 14 December 2007 <br /> R ``!'IE® <br /> 2007 <br /> Mr. Kevin Basso VI Mv E�T HEALTH <br /> General Manager - Forward Inc. PERMIT,/SERVICES <br /> 1145 West Charger Way <br /> Stockton, CA 95206 <br /> FORWARD LANDFILL HISTORIC HIGH GROUNDWATER, AREA EAST OF WMU FU-06, <br /> .SAN JOAQUIN COUNTY <br /> Regional Water Board staff has reviewed the "Forward Landfill Groundwater Elevation <br /> Evaluation East of Waste Management Unit FU-06" and the "Forward Landfill Expansion, <br /> Groundwater Elevation Evaluation"submitted on 30 November 2007 and 11 May 2007 <br /> respectively. The reports evaluate the highest anticipated groundwater elevation underlying <br /> Forward Landfill, east of FU-06 and the proposed future expansion area respectively. The <br /> reports demonstrate that groundwater levels in the Forward area dropped forty to sixty feet <br /> between 1949 and 1974 and since 1974 fluctuate within a range of thirty feet. The maximum <br /> high groundwater levels since 1974 occurred in the spring of 1984. If spring 1984 conditions <br /> were to reoccur, the maximum high groundwater elevation underlying the area east of FU-06 <br /> is anticipated to be minus 6 feet mean sea level (msl). <br /> Title 27 Section 20440 (c) states: "All new landfills, waste piles, and surface impoundments <br /> shall be sited, designed, constructed, and operated to ensure that wastes will be a minimum of <br /> five feet (5 ft.) above the highest anticipated elevation of underlying groundwater." Staff <br /> concurs that minus 6 feet msl is a valid estimate of the highest anticipated groundwater <br /> elevation for the area east of FU-06. Therefore, waste in the area east of FU-06 may not be <br /> discharged below the elevation of minus 1-foot msl and waste containment units constructed <br /> east of FU-06 must be designed accordingly. Also, liner components that are constructed at <br /> or below the highest anticipated groundwater elevation should be protected from flooding or <br /> damage by upwelling groundwater. <br /> Existing Waste Discharge Requirements (WDRs) Order No. R5-2003-0049 prohibits discharge <br /> of waste below 7 feet msl. Staff understands that CEQA for landfill expansion will be complete <br /> in approximately one year and anticipates that revised WDRs will be adopted at that time. <br /> Revised WDRs incorporating the minus 1 feet msl limit for the area east of FU-06 must be <br /> adopted before waste can be discharged below 7 feet msl. Therefore, the 2008 waste unit <br /> must be constructed to comply with existing WDRs. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />