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�.t <br /> PUB] C HEALTH SEk�VICES a <br /> SAN JOAQUIN COUNTY <br /> IOGI RH AN NA\t D <br /> kt.P H <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 (zi:irov <br /> (209) 468-3400 <br /> DAN KIRK <br /> SHELL OIL COMPANY <br /> P 0 BOX 5278 ppppt�pA <br /> CONCORD CA 94520-9998 t97Q 8 1993 <br /> RE: Shell Service Station SITE CODE: 1883 <br /> WIC #204-7524-4404 <br /> 3011 W. Benjamin Holt Dr. <br /> Stockton, CA 95219 <br /> San Joaquin County Public Health Services, Environmental Health Division CPHS/EHD) has reviewed <br /> correspondence dated March 26, 1993 from your office and has these comments. PHS/EHD can not consider <br /> this site for closure certification until a current groundwater investigation has been conducted. <br /> As indicated in your letter four soil borings were completed as monitoring wells in August 1988. These wells <br /> were only measured and sampled once. In January 1990 soil samples were collected from borings in the <br /> proposed tank area. Sample results indicated detectable amounts of Xylene, Toluene, Ethylbenzene, and <br /> TPH-diesel at 15 to 20 feet below ground surface Cbgs). According to monitoring well data from 2908 W. <br /> Benjamin Holt,Stockton depth to water in 1984 was 15 feet bgs. Therefore soil contamination was detected <br /> at and below seasonal high groundwater. Tri Regional Board Staff Recommendations Case #1B page 7 <br /> states that a groundwater/soil investigation is appropriate for sites where petroleum hydrocarbons are <br /> verified in soil at or below seasonal high groundwater. <br /> Therefore,as previously stated in our February 17, 1993 letter,a satisfactory groundwater investigation must <br /> be completed. Monitoring wells should be placed around the existing underground storage tanks and piping <br /> and in the area of known soil contamination. The site gradient must be confirmed, there must be <br /> monitoring wells downgradient of contamination, and there must be repeated sampling events to confirm <br /> results. <br /> Closure certification occurs only after investigation/remediation confirms that groundwater has not and will <br /> not in the future be impacted. <br /> Please direct your proposals to further investigate this site to Michael Infurna, Senior REHS, of my staff. <br /> Jogi Khanna, I M.P.H. <br /> Health Officer / <br /> Laurie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MI:lb <br /> c: CVRWQCB <br /> c: SWRCB <br /> • A Division of San Joaquin County Health Cue:hoses <br />