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1.4 INTRODUCTION Valley Motors operates a wholesale used car dealership at 800 East Main Street in Stockton, California and is owned by Mrs Barbara Hyduke Investigation of the extent of hydrocarbon contamination beneath the Valley Motors property has been directed by San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) 2.0 BACKGROUND 2.1 Site Location and Description 1 The site is located several blocks east of downtown Stockton and several blocks north of Mofmon Slough (Figure 1) It occupies an L-shaped parcel of land at the comer of Main and Grant Streets The area is zoned commercial and light industrial Small businesses and a vacant lot are located to the north, across Main Street, and a paint company is located to the west, across Grant Street The topography in the area is flat 2.2 Previous Work After several years of investigation and monitoring, Upgradient Environmental submitted a Problem Assessment Report and Soil Remediation Plan on behalf of Valley Motors in October 2003 That report summarizes all previous work that has been performed The reader is referred to that report for information about the history of the investigation 3 0 PROCEDURES The depth to groundwater was measured and waxer samples were collected on January 12, 2006 The wells were opened and allowed to equalize with atmospheric pressure before the depth to groundwater was measured Depth measurements were recorded on the Well Monitor Report (Appendix A) Because the water depth was more than 35 feet, well VM-5 was dry Well numbers VM-6, VM-7, and VM-8 were hand bailed because they only had about 5 to 6 feet of water Six gallons were purged from each The other four wells were pumped of 11 to 15 gallons of water prior to sampling Water samples were collected from all wells except VM-5 Three 40-m1 vials and 1- pint plastic and 1-liter amber bottles were collected from each, labeled, and placed in a cooled ice chest The samples were later transported to Excelchem Environmental Laboratory for analysis The laboratory report is included in Appendix B Mr Infurna of EHD witnessed the purging, sampling and decontaminating of the purge pump on VM-3 and VM-6 SJCEHD issued a comment letter to Valley Motors on October 12, 2005 In addition to analyzing the samples for gasoline and its volatile constituents, EHD directed Valley Motors to analyze for Total Petroleum Hydrocarbons in the diesel range, all five gasoline oxygenates, 1,2-DCA, EDB, • and total lead