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ku <br /> STATE OF CALIFORNIA <br /> - GEORGE AEUI(MEJIAN; Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— �= <br /> `CENTRAL VALLEY REGION L- <br /> 3443 ROUTIER ROAD, SUITE A' <br /> SACRAMENTO, CA 95827-3098 <br /> VEV <br /> 1 August 1990 <br /> I <br /> n E E I <br /> ` �NVIRON9ViENTA� HE.4i�s..1 i <br /> AUG 0 2 1199n <br /> PERMIT/SERVICES <br /> Ms. Diane Hinson <br /> Supervising REHS 7 <br /> i <br /> San Joaquin County Public Health Services F <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> .. -Stocktbb' CA' -95201 .. <br /> TRI VALLEY GROWERS, PLANT "T", 26200 NOWELL ROAD, THORNTON - REMEDIAL <br /> ACTION PLAN <br /> We have reviewed the 1 July 1990 Summary. Problem Assessment Report. <br /> Remedial Action- Plan prepared by WaterWork for this site. The proposed <br /> remedial action .includes extracting ground water from an existing 2-inch <br /> diameter monitoring. well and injecting the treated ground water into an <br /> upgradient monitoring well . <br /> We agree with the concept of extracting ground water from the contaminated <br /> aquifer zone and reinjecting the treated ground water on-site. However, <br /> the proposal to utilize an existing 2-inch diameter monitoring well as an <br /> extraction well should not be approved because this well was: not designed <br /> for ground water extraction. We also question whether the location of <br /> this wel is appropriate for efficiently extracting contaminated ground <br /> water. <br /> Presumably, the former underground storage tanks on-site were -the source <br /> of the contamination.' Therefore, a properly designed extraction well <br /> (minimum 4-inch diameter casing and screen) located in. the vicinity of the <br /> underground storage tank pit would be a more effective remedial measure. <br /> Local_-Oversite ..Program staff-should. request the discharger to submit..- a�- <br /> work plan farin`stallatian . 'and` testing of one or more appropriately <br /> designed extraction wells. After .the extraction wells) has been <br /> installed and tested, staff will be' able to evaluate the adequacy of the <br /> proposed remedial action plan. <br /> If you have any questions, .please call me at (916). 361-5731 . <br /> THOMAS D. PELTIER <br /> Associate Engineering Geologist <br /> TDP/tdp <br />