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4.1 Tank Removal <br /> Golden West Environmental Services of Livermore, California (Golden West) began the <br /> excavations needed to remove the old gasoline tanks on July 20, 1993. The pavement overlying <br /> ' the old tanks was cut and removed, and the fill material in the tank cavity was excavated to the <br /> tops of the USTs. The pea gravel surrounding the fiberglass UST and the sand surrounding the <br /> steel USTs were removed from the cavity and stockpiled on-site <br /> ' On the morning of July 21, 1993, Golden West placed dry ice in the four USTs to reduce the <br /> ' possibility of combustion during removal and transportation. Fuel vapors in the tanks were <br /> monitored for the presence of explosive conditions by Mr. Tony Gonzalez of Golden West. <br /> Vapor levels were determined to be within acceptable limits for removal by Mr. William <br /> Robinson of the City of Tracy Fire Department (TFD), and Mr. William Snavely of the San <br /> ' Joaquin County Public Health Services-Environmental Health Division (PHS-EHD) <br /> Golden West removed each UST by attaching chains to the top of the tank and lifting it with an <br /> excavator. After removal, each tank was inspected by Mr. Snavely and Roux All tanks <br /> appeared to be in good condition. The four USTs were loaded onto Erickson trucks and <br /> transported from the Site to Erickson's tank cleaning facility in Richmond, California <br /> 42 Soil Sampling at the Limits of the Former Tank Cavity <br /> ' Soil sampling in the former UST cavity was done immediately after the removal of the tanks on <br /> July 21, 1993. Eight soil samples were collected from the sidewalls of the excavations at a <br /> ' depth of 8 ft. bgs The samples were collected from locations selected by Mr. Harlin Knoll of <br /> the PHS-EHD (Figure 3, SW-1 through SW-8) <br /> Soil from the sidewalls of the excavations was brought up to the surface in the bucket of the <br /> excavator. All soil samples were then collected in 2-inch diameter by 4-inch long, clean <br /> stainless steel tubes. Six to twelve inches of soil were scraped away from the surface A <br /> 3 Doc #Als9wor 17 <br />