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s yE , ! �,: RN [ w J_A1'-j_,3 ander Three days were spent stockpiling, loading, and shipping excavated soil. A total of 414 cubic yards were transported to Forward, Inc. on July 1, 1989 and 384 cubic yards were transported on July 5, 1989. The excavation was 26 1/2 feet deep as of July 5, 1989 and the sands present at the bottom of the excavation were very moist, indicating the excavation bottom was at the water table. July _6, 1989 With the excavation work complete, measurements as shown on Figure 3 were taken. The south wall was 34 feet across, 'the north wall was 58 feet across, and the east and west walls were 44 feet across. Additionally, to evaluate the extent of the petroleum hydrocarbon compound presence in the south wall, nine samples, arranged in a grid, were collected. These samples are designated SS9, 17S9, 26S9, 8S18, 17S18, 8527, 17522, 26S27, and Pit 20S25 and were collected from locations shown on Figure 4. Four samples were also collected from the east wall to -,is the presence of TPH compounds detected within sample Pit 2i —L)C (go ppm) taken from that sidewall (Figure 5) . The samples were designated 14E13, 30E13, 14E26, and. 30E26. _-, July 7, 1989 A final shipment of 72 cubic yards of soil to Forward, Inc. , completed the transportation of soils from the site. The fiAal total volume of soil transported to each site is as follows: 270 cubic yards were shipped to Casmalia Resources 1,698 cubic yards were shipped to Forward, Inc. Analytical results of the grid sampling of the south wall indicated that only a limited area of soil beneath the sidewalk on the bottom of the western edge of the wall contained concentrations exceeding n 10 mg/Kg TPH. However, the soils could not be removed due to the danger of undermining the sidewalk. In order to assess the lateral extent of the TPH presence beneath the sidewalk, two lateral borings were taken directly into the south wall at a depth of 27 feet below the ground surface. Samples were collected from the borings at 8' behind the excavation wall a and were taken at locations corresponding to the grid samples which exhibited significant TPH concentrations. The samples were identified as 8-S27-8 and 17-S27-8 which corresponded to grid sampling locations B-S27 and 17-S27 respectively as shown an Figure 4. rr The area west of this sample collection area was not sampled as = analytical results from borehole #5, collected during the site investigation program, had indicated no petroleum hydrocarbons were present in that area (Figure 3) . . 9