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i �I Section 1 r Introduction This technical report presents the results of the remedial investigation and feasibility study (RI/FS) completed for a former underground gasoline tank location, known as the Disco site, located at Del Monte's Plant 33 in Stockton, California. Activities at the site included a soil-gas survey, subsurface soil sampling and analyses, a groundwater ff remedial investigation, a remedial alternatives evaluation, and a recommended remedial I action plan. The investigation was conducted in accordance with the following two guidance docu- ments: Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites (North Coast Regional Water Quality Control Board, 1990), and the Leaking Underground Fuel Tank (LUFT) Field Manual (State Water Resources Control Board, 1988). The field activities were as presented in the j Workplan for the Underground Tank Investigation at the Disco Tank Site (CH2M HILL, March 1991). Objectives The objectives of this program are to: E • Identify the lateral and vertical extent of soil contamination, if any, in the vicinity of the tank location. • Test for the presence of petroleum hydrocarbons in the shallow ground- water P Y g 1 water beneath the tank site. * Evaluate remedial action alternatives. • Recommend a plan for remedial action. Background Site Description Del Monte- Plant 33 is located in Stockton, California, east of downtown and ..+ one-half mile west of Highway 99 (Figure 1-1). Three 10,000-gallon underground gasoline tanks, known as the Disco tank location, were located at the southwestern corner of Plant 33, near the intersection of Myrtle Street and Filbert Street } (Figure 1-2). Plant 33 is primarily a peach canning and packing plant. Three groundwater wells are operated at Plant 33 and are shown on Figure 1-2. Table 1-1 f describes the three wells. SF0316041RP\004.51 1-1