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PUBMC HEALTH Nrll!RVICES <br />SAN JOAQUIN COUNTY 2' <br />Q: <br />ENVIRONMENTAL HEALTH DIVISION N: <br />Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br />445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 q�/ii6wi <br />209/468-3420 <br />March 20, 1995 <br />City of Stockton <br />Dept. of Public Works <br />425 N. EI Dorado St. <br />Stockton, CA 95201 <br />Attn: Mike Miller <br />Re: French Camp Landfill Gas Monitoring Work Plan, Dec. 2, 1994 <br />Environmental Health Division (EHD) received the French Camp Landfill (FCL) Gas <br />Monitoring Plan dated December 2, 1994. An addendum to the plan was received on <br />March 14, 1995. This plan was submitted as required by CCR Section 17258.23 <br />because quarterly gas monitoring sample results have shown methane gas exceeding <br />the lower explosive limit in FCL probes #2, #6, #7, and recently #3. Section <br />17258.23 requires the implementation of a remediation plan for the methane gas <br />release entailing a description of the nature and extent of the problem and the <br />proposed remedy. <br />FCL`s Gas Monitoring Plan proposes to place two additional gas monitoring probes <br />across the slough adjacent to on-site probes #7 and #2. This would supply further <br />information as to whether or not methane gas occurs on the other side of the slough <br />and may substantiate the theory of hydraulic barrier effects of the water as preventing <br />methane gas migration. <br />Please send information on exact locations of new probes showing distances in feet <br />from existing probes. <br />Probes #6 and #3 also showed excessive concentrations of methane. If any gas <br />monitoring probes show two or more quarterly readings exceeding compliance levels <br />a plan must be submitted to EHD as per CCR 17258.23. <br />A Division of San Joaquin County Health Care Services <br />