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f <br /> STATE OF CALR:ORWA GEORGE DEUK AL"N,Gowfmr <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTiER ROAD <br /> SACRAMENTO,CA 85827-3096 <br /> it <br /> 4 January 1990 , a. <br /> YTS <br /> Ms. Diane Hinson ""� ,_-�, NEA,- <br /> Supervising REHS <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> R & B TRUCKING, 1785 NORTH CORRAL HOLLOW ROAD, TRACY - ADDENDUM TO SITE <br /> ASSESSMENT WORK PLAN <br /> We have reviewed the 27 November 1989 Addendum to the Preliminary Site <br /> Assessment Work Plan prepared by Geological Technics for this site. <br /> In response to comments made by the San Joaquin County Department of <br /> Environmental Health Services, and the Regional Water Quality Control Board, <br /> the consultant has proposed installation of two additional ground water <br /> monitoring. These wells are proposed to provide the minimum number of <br /> monitoring points necessary for determining the hydraulic gradient at this <br /> site. The proposed wells will provide the necessary gradient information. <br /> However, we note that all the wells will be located on the north side of the <br /> former underground tank location. If the gradient is determined to be other <br /> than north or northeasterly, additional investigation may be necessary to <br /> provide adequate information on water quality downgradient from the former <br /> tank location. <br /> If you have any questions, please call me at (916) 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />