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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 /> '*C <br /> 15 May 1990 E 1 V E <br /> 0'4 <br /> MAY 1 7 190-0 <br /> Ms. Diane Hinson -.vVIhON(VENTALHE�1LfM <br /> Supervising REHS <br /> San Joaquin County PERMIT/SERVICES <br /> Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> CHEVRON SERVICE STATION #9-6171, 6633 PACIFIC AVENUE, STOCKTON -WORK PLAN <br /> FOR ADDITIONAL SUBSURFACE WORK <br /> We have reviewed the 21 March 1990 work plan for additional subsurface <br /> work prepared for this site by Sierra Environmental Services. One well , <br /> installed during January 1987, is now dry. The proposed work plan <br /> includes installation and sampling of four additional ground water <br /> monitoring wells. <br /> The work plan appears generally adequate for this site investigation. <br /> However, the proposed time schedule for completing the investigation and <br /> submitting a report is excessive. We believe that the proposed work could <br /> be completed in much less time. Delaying the investigation would allow <br /> the contaminants to migrate further and increase time required for <br /> remediation. <br /> Chevron should be requested to complete the investigation and submit a <br /> Problem Assessment Report by 27 July 1990. <br /> If you have any questions, please call me at (916) 361-5731 . <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />