CORRESPONDENCE_1991-2001 - Laserfiche WebLink

Home Browse Search

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