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'f PROPOSED CLOSURE PLAN ' BEACON STATION NO. 696 2448 WEST KETTLEMAN LANE LODI, CALIFORNIA DELTA PROJECT NO. 40-93-916 1 1.0 INTRODUCTION Delta Environmental Consultants, Inc (Delta), has been authorized by Ultramar Inc (Ultramar) to conduct an investigation of soil conditions at Beacon Station No 696, located at 2448 West Kettleman Lane, Lodi, San Joaquin County, California The investigation is intended to confirm remediation of petroleum hydrocarbons in the soil beneath the site and to provide justification for regulatory closure of ' the site The location of the site is shown in Figure 1 2.0 BACKGROUND INFORMATION Prior to acquisition of the site by Ultramar in July 1990, the site was owned and operated by ' Conoco, Inc The presence of petroleum hydrocarbons in soil and ground water beneath the site was detected prior to 1985 Since that time, numerous investigations have been conducted at the site There have been 36 ground water monitoring wells or soil vapor extraction wells installed at the site and on adjacent properties A total of 19 of these wells, and a domestic water supply well, have been destroyed 1 Three single-walled underground tuel storage tanks were removed trom the site in March 1989, and were replaced by three double-walled tanks Remedial activities have included the installation of a soil vapor extraction system, which has been in operation at the site since December 1989 Site tacilities are illustrated in Figure 2 Ground water table elevations measured in the monitoring wells since February 2, 1991, are presented in Table I Ground water is present beneath the site at approximately 54 feet below grade and has historically flowed toward the south or southeast A summary of laboratory analyses of ground water samples collected since February 8, 1991, is presented as Table 2 Gro d water samples collected since ' November 23, 1992, have not contained detectable concentrations of etroleum hydrocarbons, except for the sample collected from monitoring well MW-25 on April 14, 1993, which contained relatively low ' concentrations of xylenes and total petroleum hydrocarbons (TPHg) as gasoline 1 ' RPT066 TA