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r <br /> x <br /> ` CITY OF STOCKTON �! [J ` <br /> Vfcp- <br /> AZ# isi-,R 1... <br /> DEPARTMENT OF PUBLIC WORKS <br /> CITY HALL <br /> 42n N. ELDORADO STREET <br /> STOCKTON, CA 9n2O2-1 JS7 <br /> December 2 , 1994 <br /> ED PADILLA, SUPERVISING REHS <br /> Environmental Health Division <br /> Public Health Service <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <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 . 11-0 and Soil gas probe #2 (6 . 750) in October, 1994 . <br /> Soil gas probe #7 also exceeded the LEL in July, 1994 testing with <br /> a reading of 8 . 551 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 /> 'J10uiiQctY'"lea 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 /> "STOCKTON...CALIFORNIA'S SUNRISE SEAPORT" <br />