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EXECUTIVE SUMMARY <br /> At the direction of San Joaquin County Public Health Services, Environmental Health Division, an <br /> investigation of the subsurface extent of hydrocarbon contamination has been conducted at 900 112 <br /> East Victor Road in Lodi, California The purpose of the investigation was to determine the vertical <br /> and lateral extent of soil contamination in the vicinity of a former truck fueling facility and to determine <br /> whether groundwater beneath the facility has been impacted by the petroleum release <br /> At the request of PHS/EHD, and with the approval of the State Underground Storage Tank Cleanup <br /> Fund, the following activities were performed <br /> An out-of-use domestic well, 12 inches in diameter, was surveyed with a down-hole video camera to <br /> assess the condition of the casing, identify the perforated interval, and determine the maximum depth of <br /> the well The well was also sampled with a translucent bailer and with an oil-water interface probe in <br /> order to examine the soil-water interface for evidence of floating product, <br /> Five soil bonngs were drilled and 25 soil samples collected from these borings were analyzed for the <br /> presence of TPH-g, TPH-d, BTEX, and MTBE The first boring was continuously cored through the <br /> expected zone of soil contamination, <br /> Three of the borings were completed as 2-inch diameter groundwater monitoring wells, screened from <br /> 75 to 50 feet Groundwater samples from these three wells and from the domestic well were analyzed <br /> ifor TPH-g, TPH-d, BTEX, and MTBE and the wells were surveyed and developed, <br /> The other two borings were backfilled with cement grout from total depth (55 feet) to the surface after <br /> a hydropunch was used to collect a groundwater sample from each These samples were analyzed <br /> according to the same protocol, <br /> Three geologic cross sections, a groundwater gradient map, and maps showing the distribution of <br /> hydrocarbons in soil and groundwater were prepared These exhibits are used in the report to <br /> present the results of the investigation and provide recommendations regarding future work at the <br /> site <br />