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�- <br /> S TEC C4UFORNIA <br /> GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOA C EIVE,D.�" <br /> CENTRAL VALLEY REGION3443 ROUTIER ROAD + <br /> SACRAMENTO,CA 95827-3096 J_A N 1 8 IqJJ <br /> ENVIRONMENTAL HEALTH ' <br /> PEWIT/SERVICES <br /> Ms. Diane Hinson 15 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 /> ...�.,,� .. ST-EPHENS ANCHORAGE .PROPERTY,. 4950 WEST BROOKSIDE 6AD, STOCKTON — SUMMARY <br /> REPORT..y:_ ,F <br /> We have reviewed_ the 21 'September 1989 Summary Report -prepared -by Water Work <br /> for this site. Petroleum hydrocarbons were detected . i'n ground water during <br /> the removal of three underground storage tanks onsite .: 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 welljbelow the designated level to <br /> protect ground water. Please note that: the Desiginated. 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 existingground water monitoringwells:. may not be adequate to <br /> monitor water quality downgradient from the former tank location. The <br /> gradient at the site should be reevaluated and the mon'it_oring wells resampled., <br /> to confirm the results. of the initial investigation. "'Also, we note: that the` <br /> _samples for. the..previ.ous round.oft ground-water, samp-1 ing ,we.re. shipped -via.. . . <br /> Greyhound, this constitutes a break in the chain 'of custody. If concurrence <br /> of site 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) 361t5731. - <br /> THOMAS D: PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />