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STATE OF CALIFORNIA - GEORGE DEUKMEJIAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> G" <br /> CENTRAL VALLEY REGION. , <br /> 3443 ROUTIER ROAD, SUITE Alp� 7 <br /> SACRAMENTO, CA 95827-3098 °A=" <br /> ' <br /> 11 September 1990 � <br /> SEP 1T1 <br /> ENVIR1��� WI[N iAL_ IHIEALTF <br /> Ms. Diane Hinson c'ERNII i% RVI , S <br /> .Supervising RENS <br /> Environmental Health .Division <br /> San Joaquin County Department of Public Health Services <br /> P:O. Box 2009 <br /> Stockton CA '95201 <br /> H S CHEVROLET CO. -. INC. 423 NORTH MADISON STOCKTON - .PROPOSAL TO CONDUCT A <br /> CAE , <br /> PRELIMINARY SITE INVESTIGATION <br /> We have reviewed the 14 August 1990 proposal for conducting a preliminary site <br /> investigation prepared by WaterWork. for this site.. The proposal includes <br /> installation and sampling of two soil :borings and three ground water <br /> monitoring wells to evaluate the potential- impact on soil and ground water in <br /> two underground storage tank areas. <br /> Based on our review of the proposal , we find the proposal to be generally <br /> acceptable, and with the provision that an.,adequate number of monitoring wells <br /> are installed, the proposal -should be accepted. <br /> Because it will not be possible to evaluate the direction of ground water flow <br /> in the vicinity of the eastern tank complex using only the .two monitoring <br /> wells proposed, at least one additional 'monitoring well will be. necessary. <br /> This gradient determination will be necessary to determine whether the leaking <br /> fuel tank has had an impact on water quality. <br /> If you have any questions, please call Tom Peltier at (916) 361-5731 . d <br /> THOMAS D: PELTIER <br /> Associate Engineering Geologist <br /> TDP:tdp <br /> f <br /> l <br />