ARCHIVED REPORTS_XR0004374 - Laserfiche WebLink

Home Browse Search

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.OBACKGROUND 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 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 ithat report for information about the history of the investigation No work took place at this site during the third quarter of 2005, and no report was prepared This report summarizes the work that was performed during the fourth quarter 3.0 PROCEDURES The depth to groundwater was measured and water samples were collected on November 4, 2005 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 A pump was used to purge the wells of approximately nine gallons of water prior to sampling Water samples were collected from all wells except VM-5 Two 40-m1 vials were collected ftom 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 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, i 2 _