ARCHIVED REPORTS_XR0004385 - Laserfiche WebLink

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1.0 INTRODUCTION Valley Motors operates a wholesale used car dealership at 800 East Main Street in Stockton, California and was owned by Mr Andrew Hyduke until his death on June 12, 2001 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 corner 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 It is our understanding that two UST's were removed from the site by Siebold Corporation in 1990 The tanks were located beneath the sidewalk along Grant Street (Figure 2) Investigation of the extent of soil contamination began in 1994, and assessment of groundwater contamination started in 1995 Two more monitoring wells were dulled in 1996, and monitoring has continued on a fairly steady basis since about 1998 A fourth monitoring well was installed in 1998, after a soil vapor survey was completed to delineate the extent of soil contamination ' 3.0 PROCEDURES The depth to groundwater was measured and water samples were collected on June 5, 2001 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) and are shown in Table 1 After the depth was measured, a submersible purge pump was used to purge approximately 20 gallons of standing water from VM-3, followed by VM-4, VM-2, and then VM-1 (Appendix A) Only about 7 gallons were purged from VM-4 before it went dry Hydraulic conductivity and temperature were measured at two-to-four gallon intervals near the end of the purging process to insure that these parameters stabilized and fresh formation water was being recovered The water removed from VM-1 and VM-2 contained a considerable amount of sand and silt, and the water from VM-2 had a distinct sewer odor After purging, samples were collected in disposable Teflon® bailers and poured into labeled 40-m1 vials The samples were subsequently transported to Excelchem Environmental Labs for analysis The laboratory report is included in Appendix B 2