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PRE-TANK REPLACEMENT Site Assessment Results 4315 WATERLOO RD, STOCKTON, CA Aegis Project No. 89-047 Page 1 1.0 INTRODUCTION Aegis Environmental Consultants (Aegis) is hereby submitting the results of a pre-tank replacement site assessment conducted at the Shell retail service station located at 4315 Waterloo Road, Stockton, San Joaquin County, CA. The San Joaquin County assessor's parcel number for the site is 087-10-34 (figure 1). The purpose of the site assessment was to assess subsurface conditions at the proposed location of new underground storage tanks, and the existing tank basin. Briefly the scope of Aegis' services included the following: 1) Drilling and sampling four soil borings at the existing underground storage tank basin and associated plumbing system at the locations identified in figure 2. 2 Drilling and sampling six soil borings at the proposed underground tank location, as shown in figure 2. Drilling and sampling four soil borings at the fuel island, at the locations identified in figure 2. Recovering soil samples from each of the soil borings at five foot vertical spacings. Logging each of the soil samples in accordance with the Unified Soil Classification System. 6 Screening each of the recovered samples for the presence of petroleum hydrocarbons with a photoionization detector (PID). 7 Submitting a total of fourteen soil samples to a state certified laboratory to be analyzed for petroleum hydrocarbons. 8 All field work and analytical procedures were performed in accordance with the methods outlined in Appendix A, and conform to the "Tr-Regional Guidelines" for the initial evaluation of underground tanks. 9) Preparing this report presenting the results of Aegis'site assessment, with conclusions and recommendations for soil mitigation during the planned tank closure/replacement.