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MEMORANDUM <br />August 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 />AUSTIN ROAD AND FRENCH CAMP LANDFILL GAS MONITORING RESULTS <br />Attached are copies of the recent gas monitoring results tested by <br />Twining Laboratories. <br />The result indicates methane gas exceeding the lower explosive <br />limits at Soil gas probe #7 (8.55°.) at French Camp landfill and <br />Soil gas probes #6 (9.1016) and #11 (5.050) at Austin Road landfill. <br />None of the above soil gas probes are located at the property <br />boundary. <br />At French Camp landfill, Soil gas probe #1 and #3 are the only <br />probes not located in refuse. The remaining 5 probes are located in <br />refuse due to the difficulty in installing the probes at the <br />property boundary. <br />Soil gas probes #6 and #11 at Austin Road landfill also are not <br />located at the property boundaries. Soil probe #11 is set in <br />refuse, and soil probe #6 is affected by the temporary <br />disconnection of the extraction system installed by Pacific Energy. <br />The City of Stockton feels that public health and safety is not <br />endangered because of the following reasons: <br />1. The gas migration cannot occur due to the hydraulic barrier <br />(Walker Slough and French Camp Slpugh) adjacent to Soil gas <br />probe #7 at French Camp landfill, and (Little John's <br />Creek) adjacent to Soil probe #6 at Austin Road landfill. <br />2. The property boundary is approximately 800' from Soil gas <br />probe #11 at Austin Road landfill and 1500' to the <br />southerly CYA fenced boundary. <br />3. Both the Austin Road and French Camp landfill is gated and <br />fenced for security purposes and the scale houses and all <br />cargo boxes tested 0% LEL. <br />