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t 1.0 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 The site is located several blocks east of downtown Stockton and several blocks north of Mormon 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 Iocated 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 water samples were collected on June 16, 2004 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 The wells were purged using the surge-and-purge method Approximately two gallons of water were removed from each well Water samples were collected from all wells except VM-5 Two 40-m1 vials were collected from each, labeled, and placed in a cooled ice chest The samples were Iater transported to Excelchem Environmental Laboratory for analysis The laboratory report is included in Appendix B • 2