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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION t� <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO, CA 95827-3098 <br /> 27 March 1990 <br /> Ms. Diane Hinson <br /> Supervising REHS <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> TRI-VALLEY GROWERS, PLANT "T", 26200 NOWELL ROAD, THORNTON - GROUND WATER <br /> MONITORING REPORTS, THIRD & FOURTH QUARTERS 1989 <br /> We have reviewed the 20 November 1989, and 15 January 1990 Ground Water <br /> Monitoring Reports for the third and fourth quarters of 1989, prepared for <br /> this site by WaterWork. <br /> The Third Quarter Monitoring Report presents the results of the <br /> 19 September 1989 round of ground water sampling and addresses comments <br /> raised in the Environmental Health Division's letter of 27 July 1989. The <br /> Fourth Quarter Monitoring Report presents the results of the 7 December <br /> 1989 round of ground water sampling and proposes that the monitoring <br /> program be continued for one additional quarter. <br /> According to the reports, the ground water gradient at the site has <br /> changed several times during the course of the investigations. We agree <br /> that continued monitoring will be necessary to determine the cause of the <br /> gradient shifts, and the possible influence on contaminant migration. <br /> However, it is unlikely that monitoring the existing wells for one <br /> additional quarter will be adequate to establish a trend in gradient and <br /> adequately determine the extent of contaminant migration. <br /> Therefore, we recommend that the quarterly ground water monitoring program <br /> be continued until the extent of the impacts to water quality have been <br /> adequately evaluated. After sufficient information has been collected, <br /> it will be possible to evaluate the need for installing additional <br /> monitoring wells to determine the extent of migration of petroleum <br /> hydrocarbons. <br /> If you have any questions, please call me at (916) 361-5731 . <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />