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I <br /> MA <br /> April 15, 1993 Working To Restore Nature <br /> I ARCO Service Station No 2076, Lodi, California <br /> The local surface drainage includes the Mokelumne River and the South Main Canal The <br /> Mokelumne River drains to the west approximately 1 mile north of the City of Lodi The <br /> South Main Canal flows to the south approximately 3 miles west of the site <br /> i <br /> PREVIOUS WORK <br /> Intial Assessment of Soil <br /> In October 1990, RESNA (formerly Applied GeoSystems), as part of the pretank <br /> replacement assessment, observed the drilling of three soil borings near the tank complex <br /> (borings B1, B2, and 133) and two soil borings east of the station building in the area <br /> designated as the new tank cavity (borings B-4 and B-5) (Applied GeoSystems, December <br /> 18, 1990) Results of chemical analyses of soil samples collected from soil borings are <br /> shown on Table 1 Boring locations are shown on Plate 2 and were selected using ARCO's <br /> Preliminary Tank Replacement Assessment guidelines Ground water was encountered at <br /> approximately 30 feet below grade <br /> In July 1991, RESNA observed drilling of three additional soil borings (B-6, B-7 and B-8) <br /> and the installation of three vapor-extraction wells (VW-1, VW-2, and VW-3) Vapor- <br /> extraction well construction details are shown on the Logs of Borings (Appendix A) Boring <br /> and well locations are shown on Plate 2 <br /> Vapor-Extraction Test <br /> RESNA performed a vapor-extraction test on July 30, 1991, using an internal combustion <br /> engine and vapor-extraction wells VW-1, VW-2, and VW-3 (RESNA, September 12, 1991) <br /> The vapor-extraction test was conducted to collect site specific data and evaluate the <br /> feasibility of vapor extraction as a soil remediation alternative, and to evaluate the off-gas <br /> 30008-5 3 <br />