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' Califor�a Integrated Waste Mana et Board <br /> g g <br /> ka-mm- <br /> Dan Eaton, Chairman ' <br /> 8800 Cal Center Drive • Sacramento California 95826 (916)255-2200 <br /> www.ciwmb.ca.gov <br /> Winston H.Hickox C.: Gray Davis <br /> Secretaryfor Governor <br /> c._ <br /> Environmental <br /> Protection -- <br /> July 5, 2000 <br /> Mr. Robert McClellon,REHS " <br /> LEA Program Manager _ <br /> Public Health Services <br /> P.O. Box 388 <br /> Stockton, CA 95202--0388 <br /> SUBJECT: LANDFILL GAS MONITORING AT THE CORRAL HOLLOW SANITARY LANDFILL <br /> SWIS#39-AA-0005 <br /> Dear Mr. McClellon: <br /> On June 2lst, 2000, staff of the California Integrated Waste Management Board (CIWMB) conducted a <br /> site visit at the Corral Hollow Sanitary Landfill. The purpose of the site visit was to observe conditions <br /> at the site that would otherwise jeopardize the integrity of the landfill cover, the gas system and drainage <br /> and erosion control systems. <br /> During our site visit, we did not observe any apparent drainage/erosion problems and cracks or <br /> settlement at the site. However,based on a round of gas monitoring performed by CIWMB staff on <br /> June 21, 2000, as well as the latest gas monitoring results submitted by the County of San Joaquin, <br /> Department of Public Works (DPW), we believe that the site has been and continues to suffer from <br /> landfill gas migration. Gas concentration as high as 57.7% and 38%have been detected by DPW's staff <br /> and CIWMB's staff respectivelly. The gas monitoring probes#1, 2, 3, and 6 were detected with gas <br /> concentrations greater than the regulatory threshold of 5%by volume at the facility boundary. The <br /> following table shows the result of our gas monitoring: <br /> Probe Depth C114 (% volume) 02 (%) <br /> Number <br /> 1 Shallow 0.8 20.7 <br /> 1 Intermediate 9.1 8.5 <br /> 1 Deep 33.0 4.9 <br /> 2 Shallow 13.0 15.3 <br /> 2 Intermediate 33.0 6.6 <br /> 2 Deep 38.0 4.4 <br /> 3 Shallow 7.7 16.6 <br /> 3 Intermediate 22.0 4.8 <br /> 6 m 3 De 12.0 0 <br /> California Environmental Protection Agency <br /> Printed on Recycled Paper <br />