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4 <br /> south wall; some minor contamination was noted in that area, but <br /> it could not be adequately cleaned up. <br /> During the work, groundwater again began entering the hole; it <br /> was measured at 14' below grade on the east side of the <br /> excavation, and about 15-16' below grade on the north. Sediments <br /> from the bottom of the hole consisted primarily of moist, very <br /> silty & clayey sand; they had a slight petroleum odor, but no <br /> visible evidence of free product or sheen was noted in the water. <br /> Because of monitoring wells #1 & #2 to the west & north, under-- <br /> ground utilities on the east, and the building & foundation to <br /> the south, it was not possible to remove all of the contaminated <br /> soil encountered during the work. The remaining contamination <br /> will have to be treated by other methods at a future date. At <br /> this time, the dimensions of the excavation were 19' x 19' x <br /> 15-17' deep, as shown on PLATE TV. <br /> Mr. Steve Sasson, RENS, from. the San Joaquin County EHD, arrived <br /> at about. 1500 hours, and it was agreed that further excavation <br /> was not possible. As directed by Mr. Hunter & Mr. Sasson, five <br /> soil samples were taken from the backhoe bucket as shown on PLATE <br /> T1V. A clean metal tube was pushed into the soil on the teeth of <br /> he backhoe bucket by the geologist, making sure that there was <br /> no headspace_ The ends of each tube were promptly covered with <br /> teflon tape & plastic end caps, and thoroughly sealed with duct <br /> tape- The tube was clearly labeled & placed on ice in a sealed <br /> chest for preservation. A brief description of the preserved <br /> samples is given here: <br /> Btm - 16' 6" Sandy clay, grey to tan, damp; petroleum odor & <br /> visible discoloration noted. <br /> North - 12' Very clayey sandy silt, grey to tan; slight odor & <br /> minor discoloration noted. <br /> West - 11' Tan to gray silty clay, slight odor & discoloration. <br /> South - 11 ' Very clayey, sandy silt, tan to grey; slight <br /> petrole odor, but no v' sib a d' scol ration. <br /> After completion o this wok, the ge'40gist toles fro ok a �tot of five <br /> {5) samples m the two piles of contaminated soil which had <br /> been placed inside the empty building. The approximate locations <br /> of those samples is shown on PLATE V. The samples were collected <br /> by pushing a clean metal tube into the spoil & sealing and <br /> preserving them as described above. <br /> ,• After completion of sampling operations, the preserved material <br /> 4 <br />