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®ds S. Adams <br />SemaofyJor <br />Envrronntemoi <br />Protection <br />U <br />California'Regional Water Quality Control Board -- <br />Central Valley Rogi'on <br />Karl E. Foagk+y,.SeD, FE, ebsir <br />Amold <br />Sacramento hfisuâ–º t)rf ce Sehwan6eggor <br />1'Y02* Sun Cenicr Dfive:s200. Ran¢iw Cordova. California 95670.61.14 Governor <br />Phonc (91:6) 464-3251 ; F kXAW9 ) 4644645 <br />httptitwww.watcrboards.cagov/cenualvallcy <br />14 December 2007 <br />Mr. Kevin Basso <br />General Manager - Forward Inc. <br />1145 Vilest Charger Way <br />Stockton, CA 95206 <br />FORWARD LANDFILL HISTORIC HIGH GROMMMAM9 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 "ForwardLandfill 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 1,974 and since 1:974 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 aree east of FU -06 <br />is anticipated to be minus 6 feet mean sea level (msl). <br />Title 27 Section 2044.0 (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 coh3. ponents 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 rmml. Staff understands that CE=QA for landfill expansion will be complete <br />in approximately one year and anticipates that. revised. WpRs 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 200& waste unit <br />must be constructed to comply with existing WDRs. <br />California. Environrmental.Protection.Agency <br />Re p cird Paper <br />