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A WORK PLAN FOR SOIL AND 'GROUNDWATER CHARACa'ERIZATION GEWEKE LAND DEVELOPMENT AND MARKETING 16 SOUTH CHEROKEE LANE, LODI, CALIFORNIA This work plan has been prepared for Geweke Land Development and Marketing (GLDM). The work plan will be submitted to GLDM, the San Joaquin Environmental Health Department(County),and the California Regional Water Quality Control Board, Central Valley Region (Regional Board) for review and approval. This work plan \-isinmarizes available information regarding soil and groundwater contamination at the GLDM site and describes the objectives of&.e proposed work. The work plan describes the methods to be used in the field, including borehole drilling, soil sampling, well installation, well development, and groundwater sampling. The work plan also presents a. quality assurance and quality control plan for sample collection, which includes sample handling and, decontamination procedures in the field.. This plan proposes a project schedule for work at the site and the submittal of a report to the regulatory agencies after the completion of the work. A site health and safety plan is also included with this work plan. Before commencing work at the site, all necessary permits will be acquired from the County. BACKGROUND The location of the GLDM site is shown on Figure 1. Elevation at the relatively flat project site is about 55 feet above sea level. The area is immediately underlain by Quaternary-age alluvial deposits. These deposits consist of complexly interbedded and interfingered sands, silts, and clays. The freshwater aquifer occurring in these deposits is unconfined and occurs throughout the region. The regional groundwater flow direction ranges j from south to west. Depth to groundwater in 1986 was approximately 44 feet. The site is a former Gas-N-Save gasoline station. Two 10,GW -A;!i'n and one 6,000 gallop fuel storage tanks, and one 1,000 gallon waste oil storage tank were removed from the site in 1985. Figure 2 shoes the locations of the former storage tanks. No soil samples were taken from the excavations during tank removal. According to previous reports by J. H. Kleinfelder and Associates (JHK), a County representative on site during excavation did not note hydrocarbons in the excavated soil. GLDM was directed by the County in 1985 to conduct a site investigation to determine if hydrocarbons were pr-sent in the soil due to possible leakage from the 1,000-gallon waste oil tank. GLDM contracted with JHK to complete the site investigation. JHK drilled four boreholes and installed monitoring wells, MW-1 through MW-4 (Figure 2). The wells were drilled to a depth of approximately 60 feet and were completed with 20 feet of 2-inch-inside- diameter 0.020-slotted polyvinyl chloride (PVC) casing and 40 feet of 2-inch-inside-diatneter PVC blanx casing.