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THOMAS R.FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> �~• DIRECTOR yh STOCKTON,CALIFORNIA 95201 <br /> i eM � (209)468-3000 FAX(209)468-2999 <br /> Awww.sigov.org/pubworks <br /> f <br /> THOMAS M.GAU kA <br /> CHIEF DEPUTY DIRECTOR <br /> MANUEL SOLORIO Worldng for YOU <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGER JANES <br /> BUSINESS ADMINISTRATOR <br /> July 14, 2008 <br /> Mr. Todd Del Frate, PG <br /> California Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670 <br /> SUBJECT: POSTPONEMENT OF ADDITIONAL LFG WELL INSTALLATION, <br /> HARNEY LANE SANITARY LANDFILL <br /> Dear Mr. Del Frate: <br /> This letter confirms our conversation of July 9, 2007, sent as you suggested. <br /> The County installed a landfill gas (LFG) collection system at the Harney Lane Landfill in 1996 to <br /> mitigate the impact by LFG seen at groundwater well MW-4, as indicated by the presence of three <br /> volatile organic compounds (VOCs). These compounds (Dichlorodifluoromethane, <br /> 1, 2 Dichloropropane, and Tetrachloroethene (PCE))were detected consistently since 2004. The <br /> other three monitoring wells indicate no impact. <br /> In early 2007 1 proposed the installation of two additional LFG wells near MW-2 to increase the <br /> effectiveness of the landfill gas system. At that time, it appeared that mitigation was not proceeding <br /> with sufficient speed. However, since then two of the three compounds are no longer detected. <br /> 1, 2 Dichloropropane has not been detected since April 2007, and Dichlorodifluoromethane has not <br /> been detected in the last two quarters. Removal of two of the three compounds indicates that the <br /> LFG system may be successfully mitigating the groundwater impact, and cause me to question the <br /> need for additional LFG wells. <br /> In discussing this new information, you and I agreed that the new LFG wells at the Harney Lane <br /> Landfill can be postponed until at least the results of the next two quarters' data is received. We will <br /> re-evaluate the need for additional LFG wells at that time. <br /> Thank you for your help in this. If you have any questions, please call me at (209) 468-8504. <br /> Sincerely, <br /> W. MICHAEL CARROLL, PE <br /> Senior Civil Engineer <br /> WMC:kb <br /> N:\1 Harney Lane\Groundwater Mon itoring\TDeiFrate02-LFG Well Postpone.doe <br /> c: (via email):Robert McClellon, Environmental Health Department <br /> Gino Yekta, CIWMB Closure Branch <br /> LA 11870 <br />