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STATE OF GALlFORNlA 13 y GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827.309$ NOV 9 199 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SER ICE3 <br /> 8 November 1989 <br /> Mr. Ulycess Williams i <br /> 334 Olympic Circle <br /> Stockton, CA 95205 <br /> SITE LOCATED AT 2400 AIRPORT WAY, STOCKTON - GROUND MATER CONTAMINATION <br /> We have reviewed the 21 September_1989 in_vesti-gation re.portrepared ,bv <br /> -� µVersar, -Inc. The:;investigation included installation- and sampling of one on- <br /> site monitoring well . <br /> i <br /> No benzene, toluene or xylenes were detected in the ground water sample <br /> obtained from this monitoring well . However, total petroleum hydrocarbons <br /> (TPH) were detected at 32 parts per billion. While this level of <br /> contamination does not appear to pose a serious concern, additional <br /> investigation will be necessary to verify that ground. water beneath the site <br /> has not been significantly impacted.. <br /> The additional investigation should be designed to determine the hydraulic <br /> gradient at this site and the possible extent of hydrocarbon contamination. <br /> k By 8 December 1989, please submit a work plan forlcompleting this <br /> investigation. We have enclosed a copy of our guidance document which <br /> includes the recommended reporting requirements. ItThe work plan should be <br /> designed to provide all the information necessaryjfor preparing a complete <br /> Problem Assessment Report. If additional investigation confirms that only low <br /> levels of TPH are present, quarterly ground water;�monitoring to detect any <br /> migration of contaminants may be appropriate. <br /> If you have any questions, please call me at (91 6) 361=5731 . <br /> { I �G / V Vim``r"�� ,.•i _. �- � <br /> THOMAS D.PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br /> Enclosure <br /> cc:vtaurie Cotulla, San Joaquin County Department1Iof Public Health Services, <br /> Stockton <br /> Kayo Ookken, Versar, Inc. , Sacramento <br />