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Former Beacon Station 494 August 8, 1995 SITE DESCRIPTION AND BACKGROUND Former Beacon Station No 494 is located on the northwest corner of the intersection of East Fremont Street and "D" Street in Stockton, California The site is at an elevation of approximately 20 feet above mean sea level Stockton is located in the central portion of the Great Valley Region of California Site facilities include a station building, two product dispenser islands located south of the station building, and the former underground storage tank (UST) pit located northeast of the product dispenser islands Locations of these and other pertinent site features are shown on the Site Plan (Figure 2) Previous environmental work at the site was performed by AMV A total of nine soil borings were drilled, with four vapor-extraction wells and five groundwater-monitoring wells installed by AMV between April and December, 1992 (AMV, February 13, 1995) Locations of the wells are shown on Figure 2 Groundwater was found to exist at approximately 71 to 72 feet below ground surface (bgs) In March 1993, the existing USTs were removed from the site Results of these investigations have indicated the presence of gasoline hydrocarbons in soil and groundwater beneath the site Remediation activities at the site were initiated in November 1993 (AMV, April 24, 1995) AMV has reported that the natural groundwater flow direction prior to remediation activities at the site is toward the west AMV reported that the groundwater flow direction is toward the pumping well (MW-3) located in the center of the site (AMV, April 6, 1995) FIELD WORK Field work was conducted on June 12 and June 13, I995, in accordance with the Horizon Site Safety Plan dated June 9, 1995 Prior to drilling, Underground Service Alert was 1494 11-RPT 2 HORIZON ENVIRONMENTAL INC.