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Page 3 i Waste Oil Tank Sampling Soil samples WO-W and WO- E were collected from the native soil approximately 7 1 / 2 feet below grade beneath the ends of the waste oil tank ( Figure 2 ) . Each sample was collected by digging approximately 1 to 2 feet beneath the bottom of the tank into native soil with an excavator bucket and then collecting the sample from the bucket as described above . Trench Sampling Trenches were excavated to expose and remove underground product piping and vent lines extending from the fuel UST complex to the service islands . Soil samples P - 1 through P - 4 were collected after piping was removed at a depth of approximately 3 1 / 2 to 4 feet below grade respectively ( Figure 2 ) . Samples were collected from the excavator bucket as described above . These samples were collected from locations designated by William Snavely and in accordance with the Tri - Regional Water Quality Control Board San Joaquin County Public Health Services recommendations . Sump and Hoist Sampling Two semi - hydraulic hoists and an oil /water separator ( sump ) were removed and discrete soil samples were collected from beneath the sump and hoists at approximately 7 1 / 2 feet below grade . Soil samples were designated " Hoist " and " Sump " and were located as shown in Figure 2 . The sump and western most hoist were next to each other and are represented by the discrete sampledesignated " Sump " . Stockpile Sampling Soils generated during the fuel UST removal activities were stockpiled and sampled . Approximately 300 cubic yards were generated from the removal of the USTs and piping . Samples designated SP - la -b through SP - 6a-b were collected from the fuel UST and piping stockpiles ( Figure 2 ) . Soils generated from the waste oil tank , sump and hoist excavations are characterized by samples designated WSP - la- c and represents approximately 40 - 50 cubic yards of soil ( Figure 2 ) .