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F <br />WCITY OF STOCKTON <br />��NTAL HEALTIt <br />A94 <br />DEPARTMENT OF PUBLIC WORKS <br />CITY HALL <br />425 N. EL DORADO STREET <br />STOCKTON, CA 95202-1997 <br />December 2, 1994 <br />ED PADILLA, SUPERVISING RENS <br />Environmental Health Division <br />Public Health Service <br />P.O. Box 2009 <br />Stockton, CA 95201 <br />94 Qcr -5 pH 1: 34 <br />FRENCH CAMP LANDFILL GAS MONITORING WORK PLAN <br />The French Camp Landfill gas monitoring results indicates methane <br />gas exceeding the lower explosive limits (LEL) at Soil gas probe #7 <br />(9.1%) and Soil gas probe #2 (6.75%) in October, 1994. <br />Soil gas probe #7 also exceeded the LEL in July, 1994 testing with <br />a reading of 8.55% methane. <br />Soil gas probe #7 is not located at the property boundary due to <br />the close proximity of Walker Slough. Soil gas probe #2 and #7 are <br />both located in refuse. Therefore, they do not provide an accurate <br />indication of whether or not methane concentrations exceed the LEL <br />at the property boundary. <br />The proposed work plan submitted for your consideration is to <br />install gas probes across the slough adjacent to #7 (SG #7 ALT on <br />attached diagram) and at the edge of Manthey road adjacent to #2 <br />(SG # 2 ALT on attached diagram). Our purpose in doing this is to <br />determine if the landfill gas is migrating beyond the property <br />boundaries at these .two locations in concentrations above LEL. <br />Gas Probe #7, located in refuse adjacent to Walker Slough, may not <br />be required due to the hydraulic barrier (see attached cross- <br />section) and the nearest residential homes located approximately <br />1,000 feet away. <br />