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I-UT- <br /> STATE OF C,:t WORNIA %WWI <br /> GEORGE DELKMEJIAN,Gavernar <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD —� <br /> SACRAMENTO,CA 95827-3098 <br /> Ms. Diane Hinson 16 January 1990 <br /> Supervising REHS <br /> Environmental Health Division <br /> San Joaquin County Department of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> STEPHENS ANCHORAGE PROPERTY, 4950 WEST BROOKSIDE ROAD, STOCKTON - SUMMARY <br /> REPORT <br /> We have reviewed th 21 Se tember 1989 ummary Report prepared by Water Work <br /> for this site. Petro a rocarbons were detected in ground water during <br /> the removal of three underground storage tanks on-site. Three ground water <br /> monitoring wells were installed and sampled in an attempt to define the extent <br /> of hydrocarbon contamination in soil and ground water. <br /> Total petroleum hydrocarbons as diesel were .detected in water samples from two <br /> of the monitoring wells at levels up to 110 parts per billion. According to <br /> the report, the levels of contamination are well below the designated level to <br /> protect ground water. Please note that the Designated Level Methodology <br /> applies to levels of contaminants in soils, and is intended to prevent <br /> contamination of ground water through improper disposal of contaminated soil . <br /> The Designated Level Methodology should not be applied to situations where <br /> ground water has already been impacted. <br /> The gradient of ground water flow at this site is reported to be in a south to <br /> southwesterly direction. Based on our review of the information included in <br /> the report, the existing ground water monitoring wells may not be adequate to <br /> monitor water quality owngra ient from t e crmer man soca Ton: he <br /> gradient at the site 51h be reevaluated and the monitoring weiIs r�sampled_ <br /> o con —r a results of the in3 is investigation. Also, �,ie note that the <br /> $ <br /> for the previous round of ground water sampling were shipped via <br /> 6 Greyhound this constitutes a break in the chain of custody. If concurrence <br /> certification is to be sought from the Regional Board, all sample <br /> analytical data must be accompanied by appropriate chain of custody <br /> documentation. <br /> If you have any questions, please call me at (916) 361-5731 . <br /> Alo <br /> THOMAS D. PELTIER �-- <br /> Engineering geologist CP-;n���,�j 77, Mlle <br /> TDP/tdp �s <br /> tl <br />