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STATE OF CALIFORNIA GEORGE DEUKMEJIAN, Governor <br />CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— ` <br />CENTRAL VALLEY REGION ..� <br />3443 ROUTIER ROAD <br />SACRAMENTO, CA 95827-3098 <br />� 27 November 1989 <br />Mr. Steve Chen <br />Deputy Public Works Director <br />City of Stockton <br />City Hall <br />Stockton, CA 98202 <br />`p $ <br />EN V1 Rig a4.� i <br />E 7 <br />GROUNDWATER MONITORING INVESTIGATION, FRENCH CAMP LANDFILL, SAN JOAQUIN COUNTY, <br />STOCKTON (CASE NO. 3032) <br />We have reviewed your report entitled "Groundwater Monitoring Investigation, <br />French Camp Landfill, San Joaquin County" dated November 1989. This report shows <br />a significant water quality impact at monitoring well MW -1. Therefore, a <br />verification monitoring program must be implemented to determine the extent of <br />contamination. <br />The suggested sampling of surface waters around the site should be included in <br />the verification monitoring program, but further investigation is also warranted. <br />When it was drilled, MW -1 showed signs of petroleum products on the soil at the <br />ground water table (Section 3, page 4). This could account for the high benzene, <br />toluene, xylenes, and ethylbenzene in the ground water samples from MW -1. The <br />verification monitoring program should include an investigation of this <br />possibility. <br />Please submit a proposal for a Verification Monitoring Program, which includes, <br />but is not limited to, the petroleum product and surface water investigations, <br />by 1 April 1990. This program will be considered as part of the Report of Waste <br />Discharge (RWD). The RWD is still due by 1 July 1990, but could be turned in <br />with the Verification Monitoring Program. <br />Several of the constituents found in MW -1 are at levels which may need to be <br />reported under Proposition 65. The San Joaquin County Public Health Service <br />should be informed so that a determination can be made as to whether a <br />Proposition 65 notice should be made. <br />If you have any questions please call me at (916) 361-5737. <br />K. UCKER <br />a e Discharge to Land Unit <br />JKT:ava <br />cc: vlwr,. Alan Biederman, Public Health Services of San Joaquin County, Stockton <br />Ms. J.C. Isham, Emcom Associates, San Jose <br />