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r r <br /> PUBLIC HEALTH SERVICEir S <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION to ` '` <br /> Karen Furst, M.D., M.P.H., Health Officer c�•., iP <br /> 304 East Weber Avenue,Third Floor• Stockton, CA 95202 <br /> 209/468-3420 <br /> July 25, 2000 <br /> FILE COPY <br /> Wes Johnson <br /> Solid Waste Division <br /> Public Works Department <br /> Post Office Box 1810 <br /> 1810 E. Hazelton Avenue <br /> Stockton, California 95202 <br /> Re: Landfill gas at Corral Hollow Landfill <br /> This letter is to further document and confirm that methane gas exist at the boundary above five <br /> percent at the above referenced facility. On May 4, 1995, your department submitted the first <br /> quarterly gas monitoring results. The results indicated that the facility was in violation of Title <br /> 27, California Code of Regulations (CCR), Section 20921(a)(2) (provided). The most recent <br /> monitoring results reported on April 21, 2000, indicate that the facility is still in violation. <br /> 20921:CD MB-Gas Monitoring:and Control',Uuring Closure and Postelosure T14.§1 7783) <br /> (a) To provide for the protection of public health and safety and the environment, the operator shall <br /> ensure that landfill gases generated at a disposal site are controlled in accordance with the <br /> following requirements: <br /> (1) The concentration of methane gas must not exceed 1.25%by volume in air within on-site <br /> structures. <br /> (2) The concentration of methane gas migrating from the landfill must not exceed 5%by volume <br /> in air at the facility property boundary or an alternative boundary approved in accordance <br /> with§20925. <br /> (3) Trace gases shall be controlled to prevent adverse acute and chronic exposure to toxic <br /> andlor carcinogenic compounds. <br /> (b) The program implemented pursuant to§§20921-20937 shall continue for a period of thirty(30) <br /> years or until the operator receives written authorization to discontinue by the EA with <br /> concurrence by the CIWMB pursuant to 40 CFR 258.61(b).Authorization to cease gas <br /> monitoring and control shall be based on a demonstration by the operator that there is no <br /> potential for gas migration beyond the property boundary or into on-site structures. <br /> Demonstration of this proposal shall be supported by data collected and any additional studies. <br /> (c) The gas monitoring program required pursuant to§§20921-20937,shall be described as part of <br /> the preliminary and final postclosure maintenance plan. <br /> (d) Gas monitoring and control systems shall be modified, during the closure and postclosure <br /> maintenance period, to reflect changing on-site and adjacent land uses. Postclosure land use at <br /> the site shall not interfere with the function of gas monitoring and control systems. The operator <br /> may request a reduction of monitoring or control activities based upon the results of monitoring <br /> data collected. The request for reduction of monitoring or control activities shall be submitted <br /> in writing to the EA. <br /> In 1996, Jeff Carruesco of Public Health Services, Environmental Health Division (PHS-EHD) <br /> noted on the quarterly inspection report that the gas level at the boundary as an area of concern. <br /> A Division of San Joaquin County Health Care Services <br />