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. r <br /> `R <br /> iy <br /> WORK PLAN FOR GROUNDWATER CHARACTERIZATION <br /> x GEWEKE LAND DEVELOPMENT AND MARKETING <br /> 1:.6 SOUTH CHEROKEE LANE, LODI, CALIFORNIA <br /> i - <br /> This work plan has been prepared for Geweke Land Development and Marketing(GLDM). <br /> ThA work plan will be submitted to GLDM, the San Joaquin Environmental Health Department <br /> (County), and the California Regional Water Quality Control Board, Central Valley Region <br /> (Regional Board) for review and approval. <br /> This work plan surnmarizes available inforrrcation regarding soil and groundwater <br /> contamination at the GLOM site and describes the objectives of the proposed work. The work <br /> pian describes the methods to be used in the field,including well installation, well development, <br /> and groundwater sampling. The work plan also presents a quality assurance and quality control <br /> plan for sample collection, which includes sample handling and decontamination procedures in <br /> '-' the field. This plan propo,-:c s project schedule for work at the site and the submittal of a report <br /> to the regulatory agencies after the completion of the work. A site health and safety plan is also <br /> included with this work plan. Before commencing work at.the site, all necessary permits will <br /> be acquired from the County. <br /> i BACKGROUND <br /> The lova-on of the GLDM site is shown on Figure 1. Elevation at the relatively flat project <br /> site is about 55 feet above sea level. The area is immediately underlain by Quaternary-age <br /> alluvial deposits. These deposit-,consist of complexly interbedded and interfing-red sands,silts, <br /> ' and clays. The fmshwatar aquifer a:curring in these deposits is unconfined and occurs <br /> throughout the region. The regional groundwater flow directior. ranges from south to west. <br /> Depth to groundwater in 1986 was approximately 44 feet. <br /> The rite is a former Gas-N-Save gasoline station. Two 10,000 gallon and one 6,000 gallon <br /> fuel storage tangs, and one 1,000 gallon waste oil storage tank were removed from the site in <br /> 1985. Figure 2 shows the locations of the former storage tanks. No soil samples were taken <br /> &qrn the excavations during tank removal. According to previous rrports by J. H. Kleinfeider <br /> and Associates (JHK), a County representative on site during excavation did not note <br /> hvdrocarbons in the excavated soil. <br /> GLDM was directed by the County in 1985 to conduce a site investigation to determine if <br /> hydrocarbons were present in the soil due to possible le2kage from the 1,000-gallon waste oil <br /> tark.. GLDM contracted with JM to complt.o the site investigation. JHK drilled four boreholes <br /> 7, and installed monitoring wel!s, MW-1 through MW-4 (Figure 2). The wells were drilled to a <br /> c7 - <br />