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i 1.0 INTRODUCTION Valley Motors operates a wholesale used car dealership at 800 East Main Street in Stockton, California and is owned by Mr Andrew 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) 2.011ACKGROUND 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 drilled 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 i 2.3 Future Work Valley Motors is attempting to arrange for replacement of the concrete sidewalk along the Grant Street side of the property Bids have been received from three potential contractors, and the bids are currently being reviewed It is our understanding that the City of Stockton Public Works Department will issue an encroachment permit for additional drilling in the parking lanes and sidewalks after the Grant Street sidewalk has been replaced, and that San Joaquin County Environmental Health Department will waive any fines or delinquent fees for the underground storage tank that remains on the Main Street side of the property,thereby allowing the removal of that tank to go forward during the early part of 2001 3.0 PROCEDURES The depth to groundwater was measured and water samples were collected on December 8, 2000 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 2