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Lob PROPOSER WORK PLAN FOR RETANK CLOSURE SITE ASSESSMENT Shell Service Station 3725 Tracy Boulevard,Tracy California Delta Project No. 40-89-012 Page 2 k,+ 1.2 Scope of Work To accomplish these objectives, the following work is proposed: r� • Advance ten exploratory soil borings with a hollow-stem-auger drilling rig at the locations identified in Figure 2. • Collect soil samples with a modified California split-spoon sampler for description, classification, trace gas screening, and chemical analysis by a State-certified laboratory. • Use a photoionization detector (PID) to screen soil samples for total organic vapors. Submit selected soil samples for chemical analysis. • Analyze selected soil samples for total petroleum hydrocarbons (TPH) by U.S. Environmental Protection Agency (EPA) Method 8015. Those samples with TPH concentrations exceeding 100 parts per million (ppm) will be analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020. • Prepare a factual report of our findings with recommendations for soil management during the tank removal and replacement procedure. 2.0 BACKGROUND INF RMATION 2.1 Site Setting w„ The site is currently an operating Shell service station. The site is located at 3725 Tracy Boulevard in Tracy, San Joaquin County, California (Section 17, Township 2 South, Range 5 East M.D.B. and M.). Records of the San Joaquin County Assessor's Office indicate that this is Parcel No. 211- 460-30, and that the land is owned by Shell Oil Company (Shell). Shell's regional representative is Mr. Darrell Robinson, Senior District Engineer, Pacific-Northwest District, Concord, California. The area surrounding the site is flat and situated in a commercial and residential area. The site is located immediately north of Interstate 205 at the Tracy Boulevard exit. 2.2 Site History The existing retail gasoline outlet was constructed in 1967. Figure 2 illustrates the current existing buildings and facilities at the site. The location of the three existing underground storage tanks is indicated on Figure 2, as is the proposed location for the three new underground storage tanks to be installed with the proposed site renovation. In 1967 two single-walled steel underground storage tanks of 8,000- and 10,000-gallon capacity were installed when the station was constructed. A third 8,000-gallon steel underground storage tank was added in 1970. In 1985, all three tanks were removed and replaced with three 10,000-gallon, double-walled fiberglass tanks. Dispensing lines and vent lines were not replaced at that time and