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.r <br /> June 30, 1992 �Z"H� <br /> Fire Engine Company No. 2, Stockton, California <br /> Work Plan No 38009-1, dated March 9, 1988, discusses regional geology, the approximately <br /> utilities, water supply wells'a and methods for developing and sampling the wells <br /> Results of our investigations indicated hydrocarbons were present in soil samples collected <br /> only from boring B-1 and dissolved hydrocarbons were detected in ground water in <br /> monitoring well MW-1 located nearest to the tank complex (Applied GeoSystems, <br /> November 20, 1990, Report No. 38009-2). In April 1992, first ground-water was <br /> approximately 42 feet below ground surface and the ground-water flow direction was toward <br /> the north <br /> SCOPE OF WORK <br /> To evaluate remedial alternatives, RESNA will install a pumping test well and four vapor- <br /> extraction wells and conduct a vapor-extraction test and a aquifer pump test using the wells. <br /> Well construction is discussed in the attached Field Methods Two vapor-extraction wells <br /> will be single completions and one vapor-extraction well will be a 2-inch dual well <br /> completion. The proposed locations of soil borings and wells are shown on Plate 2 <br /> Schematics of the well designs are shown on Plates 3, 4 and 5. <br /> A vapor-extraction test will be conducted to assess vapor extraction as a soil alternative and <br /> to evaluate the most appropriate type of off-gas treatment, if applicable The test will <br /> provided preliminary data of the soil volume influenced by vapor extraction The ground- <br /> water pumping test well will be used to conduct a pumping test to evaluate the aquifer <br /> parameters for remediating dissolved hydrocarbons in ground water. <br /> RESNA will conduct the following tasks <br /> o Subcontract a line locating service to locate underground lines beneath the site near <br /> the drilling area. <br /> o Acquire a drilling permit from the San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS-EHD) <br /> o Contact Underground Service Alert at least 48 hours before drilling to delineate <br /> public utility lines at the site <br /> o Drill one 12-inch-diameter soil boring in the former tank cavity to ground water We <br /> will install a 2-inch vapor-extraction well screened through the clay interval (from <br /> approximately 40 to 30 feet below grade) and a second 2-inch vapor-extraction well <br /> screened through the sand deposits (from approximately 30 to 10 feet below grade) <br /> 38009-5W 2 <br />