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R' <br /> 'PMCON/®WT SoL°d Waste Services <br /> 1326 North Market Boulevard <br /> Sacramento, CA 95834-1912 <br /> Tel. 916.928.3300 <br /> Fax. 916.928.3341 <br /> the • <br /> to SM <br /> June 7, 2001 <br /> Project No.: 791291 <br /> Ms.Wendy Arano <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827 <br /> Re: Comments to Tentative Waste Discharge Requirements for the Corral Hollow <br /> Sanitary Landfill, San Joaquin County, California <br /> Dear Ms. Arano: <br /> On behalf of the San Joaquin County Department of Public Works, Solid Waste Division <br /> (County), EMCON/OWT a subsidiary of IT Corporation is submitting this letter <br /> concerning Finding 19 of the Tentative Waste Discharge Requirements (WDRs) for the <br /> Corral Hollow Sanitary Landfill (CHSL). Finding 19 will require the SWD to install a <br /> secondary and very deep monitoring well network at the CHSL. <br /> The purpose of this letter is to provide information to the Regional Water Quality Board <br /> (RWQCB) which substantiates that this secondary monitoring well network is not <br /> necessary. <br /> BACKGROUND <br /> The CHSL was operational from the mid 1950's to May 1995. The landfill is located in <br /> the foothills along the eastern flank of the coast ranges (see Figure 1). During the period <br /> of operation the landfill mainly accepted municipal refuse and to a less degree <br /> agricultural waste from the Tracy, California area. The landfill is situated in an and <br /> environment where the average rainfall is approximately 8-inches per year. <br /> The groundwater monitoring network at the landfill was completed in 1988. The <br /> monitoring network consists of a primary series of three shallow wells (MW-4, MW-5, <br /> and SB-1) and a secondary series of three deep wells (MW-1, MW-2, and MW-3) as <br /> shown on Figure 2. The primary wells are installed in groundwater perched on the <br /> Corcoran Clay. The secondary wells were installed in groundwater detected in 1988 at <br /> depths of about 300 feet. <br /> \\SACRFPI\COMMON\sacDP\2001\PRJ\PJ7\791291.1 aa.doc <br /> (00006000) <br />