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f SuI investigation Results 6131 Pacific Ave., Stockton, CA. Aegis Project No. 90-020 Page 1 1.4 INTRODUCTION Aegis Environmental Consultants, Inc. (Aegis) is hereby submitting the results of a preliminary subsurface investigation and tank closure activities conducted at the Shell retail service -, station located at 6131 Pacific, Stockton, San Joaquin County, California (Figure 1) . The purpose of the investigation was to assess subsurface conditions prior to a planned tank closure/replacement. Results of the tank replacement activities are described in section 4.0. 1.1 PURPOQE The purpose of the subsurface investigation included the following: o Characterize the site subsurface and hydrageologic conditions. o Assess the presence of petroleum hydrocarbons in the soils and ground water beneath the site. 7. o Evaluate the need for further assessment and/or mitigation t of petroleum constituents in soil and ground water beneath the site. The purpose of the tank closLtre activities included the following -- objectives: } o Quantify the le✓els of petroleum constituents in the backfill material within the original tank basin and beneath i the location of the product lines. I o Develop an interim remediation plan to address soils i -- containing petroleum hydrocarbons. 1.2 SCOPE The subsurface investigation scope of work is summarized below. o On March 26-29, 2989 a total of fourteen soil borings were advanced using hollow-stem auger techniques to depths ranging from 21.0. feet to 55.0 feet below grade in the area of the existing underground fuel-storage-tanks, proposed new tank location, and adja:;ent locations. o Soil samples were recovered from the soil borings according to methods described in Appendix A. 1..