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a: O <br /> THOMAS M.GAU PC.O.SOX 1810-1810 E.HAZELTON AVENUE ¢¢¢E <br /> STOCKTON,CALIFORNIA 95201 <br /> DIRECTOR g <br /> • (209)468-3000 FAX(209)468-2999 <br /> www.sjgovorg/p[A.worke <br /> FRITZ SUCHMAN <br /> DEPUTY DIRECTOR <br /> MICHAEL SELLING on" ECEIVELD"' <br /> DEPUTY DIRECTOR: <br /> DEPUTIM <br /> Y DIRT NE DIRECTOR AUG 2 31013 <br /> DEPUTY <br /> RoceR IANEs August 232013 <br /> BUSINESS ADMINISTRATOR ,STRATOR a,.�,®I ' <br /> MTH <br /> �yEWMNIVI Eto TAg�L�pecw <br /> MITISEFMCES <br /> Mr. Robert McClellon, Program Coordinator <br /> Environmental Health Department <br /> 1868 E Hazelton Avenue i <br /> Stockton, California 95205 <br /> SUBJECT: THIRD QUARTER 2013 LANDFILL GAS MONITORING DATA AND <br /> REMEDIATION PLAN AT THE HARNEY LANE SANITARY LANDFILL <br /> Dear Mr. McClellon: <br /> Enclosed, please find the Third Quarter Landfill Gas Monitoring Data for the closed Harney Lane <br /> Landfill. <br /> This letter is submitted in conformance to Section 20937 (a)(2)(B) of Title 27, describing <br /> measurement of methane concentration at two perimeter migration monitoring wells above the k <br /> regulatory limit of 5%. <br /> Please also consider this letter the description of the Remediation Plan required by Section <br /> 20937 (a) (3). Note that although Section 20937 (a) (3) requires that we implement a remediation <br /> plan within 60 days of detection, implementation of remediation began immediately after these <br /> detections. <br /> GW-1 (Deep probe) 5.1% <br /> GW-11 (Deep probe) 12.6% <br /> (Middle probe)15.6% i <br /> Trace gasses were not measured.. <br /> 1 <br /> All monitoring points were in compliance during recent monitoring (July 6, 2013). <br /> Well GW-1 is adjacent to structures in the itinerant labor facility west of the landfill (Figure 1). The <br /> soil beneath the foundations of the structures was monitored on August 16. Methane <br /> concentrations were zero or at the lower limit of detection for our instrument; therefore, we do not <br /> consider the detection at that well to indicate a threat to human health and safety. I <br /> a <br /> Well GW-11 is located in the general vicinity of a residence to the east of the landfill property j <br /> boundary. We contacted the resident of the house and, with her permission, verified that ! <br /> combustible gas was not detectable within the structure or exterior conduits that could provide a <br /> path for landfill gas to the structure. Therefore, we do not believe that human health and safety is <br /> threatened at this location. <br />