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l � <br /> x WALLACE o G(UML <br /> Er ASSOCIAYES INC. <br /> January 18, 1993 <br /> Mr Michael Collins <br /> San Joaquin County Public Health Services <br /> P O Box 2009 RECENhu <br /> Stockton, California 95201 JAN 2 5 19993 <br /> REPORT OF FINDINGS ENVIRONMENTAL HEALTH <br /> .IVM ASSOCIATES <br /> PERMIT/SERVICES <br /> 781 Swift Way <br /> x I Stockton, California <br /> } I WKA No 1735 02 <br /> I <br /> 1 <br /> In accordance with our workplan of August 13, 1992, we completed the installation <br /> 1 of two additional ground water monitoring wells on the subject property on October <br /> + 12 and 13, 1992 (Plate 1) Following development, the wells were sampled and <br /> } i surveyed December 16, 1992 The purpose of our work was to evaluate the ground <br /> i water conditions beneath the subject property and evaluate potential ground water <br /> contamination associated with previous underground storage tank use The scope <br /> of our work included the installation and development of two additional ground <br /> water monitoring wells, surveying the three on-site wells to a known elevation, and <br /> Geotechnical EngineEring calculation of the local ground water flow direction and gradient (Plate 2) <br /> Engineering Geology The two additional wells (MW2 and MW3) were constructed to a depth of 50 feet <br /> below surface grade Well logs and construction details are presented on Plates 3 <br /> Environmental Consulting and 4 Soil samples were obtained at approximate five-foot intervals and selected <br /> Remediation SerVlleS samples submitted with chain-of-custody documentation to a California-certified <br /> laboratory for analysis of Total Petroleum Hydrocarbons (TPH) using Modified EPA <br /> 1 Construction Inspection method 8015/Purge-and-Trap and for Benzene, Toluene, Ethylbenzene, and Total <br /> /' Xylenes (BTEX), using EPA method 8020/Purge-and-Trap <br /> Materials Testing <br /> 1 The wells were developed, allowed to equilibrate for 24 hours, then sampled Each <br /> 1 <br /> water sample was also submitted with chain-of-custody documentation to a <br /> California-certified Iaboratory for analysis of TPH and for BTEX, using EPA <br /> 3050 IndUStriai Blvd method 602 A detailed discussion of monitoring well construction and sampling <br /> procedures is included in Appendix A <br /> West Sacramento <br /> CA 95691 <br /> s <br /> Fax 916 372 2565 <br /> ti <br /> 916 372 1434 <br /> Het)cid pap <br />