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/purH"� <br /> X04'� .coy <br /> THOMAS R. FLINN P.0.BOX 1810-1810 E.HAZELTON AVENUE <br /> I ' `� DIRECTOR a '4h ' STOCKTON,CALIFORNIA 95201-3018 <br /> (209)468-3000 FAX(209)468-2999 <br /> tiwvw.sjgov.org/pubworks <br /> THOMAS M.GAU ^- <br /> CHIEF DEPUTY DIRECTOR <br /> MICHAEL SELLING - - - - <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGER DANES <br /> BUSINESS ADMINISTRATOR January 25, 2011 <br /> Mr. Todd Del Frate <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670-6114 <br /> SUBJECT: SECOND SEMESTER 2010 GROUNDWATER AND SURFACE WATER MONITORING <br /> REPORT; FOOTHILL SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> Enclosed is the Second Semester 2010 Croum_dwater and Surface Water Monitoring Report for the <br /> Foothill Sanitary Landfill. Groundwater monitoring continues on a'semi-annual"basis in accordance with <br /> our WDRs. <br /> We are pleased to report that the water in our groundwater monitoring wells meets drinking water <br /> standards. <br /> The upgradient Well MW-4 has been sampled ten times since installation, which is not sufficient for <br /> analysis by Sanitas. The County has accelerated sampling from that well to obtain sufficient data as <br /> soon as feasible, but in the meantime, statistical analysis using data from MW-4 (previously considered <br /> upgradient, now known to be cross-gradient) provides provisional conclusions. <br /> As promised, the County replaced the pump at MW-1 to allow water sampling. General parameters <br /> minerals and inorganic results are unremarkable. <br /> One VOC (TCE)was reported in well MW-3, below 0.6 ppb and at lower concentrations than last year. <br /> We intend to increase corrective action by increasing collection of landfill gas from that portion of the <br /> landfill. I expect these low concentrations to dissipate quickly. <br /> However, the County continues to be concerned that installation of impermeable liner over refuse <br /> decreases the potential venting of LFG in spite of the presence of a LFG collection system. Sealing the <br /> refuse from the air can prevent the escape of LFG, forcing LFG into the soil where impact to groundwater <br /> can occur. <br />