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PUBLIC HEALTH SAVICESPgUN <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street * P. O. Box 388 o Stockton, CA 95201-0388 <br /> 209/468-3420 <br /> March 20, 1995 <br /> City of Stockton <br /> Dept. of Public Works <br /> 425 N. El Dorado St. <br /> Stockton, CA 95201 <br /> Attn: Mike Miller <br /> Re: French Camo 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 />