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completely p etely so that no headspace remained in the tube at either end. Immediately after filling, <br /> each end of the tube was covered with aluminum foil and a plastic cap, and sealed with duct <br /> tape The samples were labeled with the project name, time, date, sample identification number <br /> and sampler's initials, and placed in a plastic bag All samples were stored on ice in a cooler <br /> chest while in transit to the laboratory Chain-of-Custody documentation was maintained for all <br /> ' samples <br /> ' <br /> 43 Soil Sampling Below Removed Product Lines <br /> Sampling of the soil beneath the removed product lines and pump islands took place on <br />' September 9, 1993 Roux collected five soil samples from the bottom of the product line <br /> trenches at intervals of approximately every 20 linear ft. (Figure 3). All of the samples were <br />' collected at a depth of about 2 5 ft bgs The product line samples were collected in stainless <br /> steel tubes and prepared for transport to the laboratory in the same manner utilized when <br />. sampling beneath the former USTs. <br /> 1 <br /> 44 Installation of the New USTs and Conductor Casings <br /> Following removal of the old USTs, Triangle excavated the remaining fill material and native <br />' soil inside the tank cavity to about 16 ft bgs and stockpiled the soil on-site. Triangle initially <br /> installed four new, double-wall, 10,000-gallon fiberglass USTs and six conductor casings on <br />' August 26, 1993. The new tanks and conductor casings were repositioned in the excavation on <br /> September 1, 1993, to align the tanks in the proper position for operation The six conductor <br />' casings are located between the new USTs (Figure 4) Each conductor casing consists of a 16 <br /> ft. long section of 12-in. diameter solid PVC pipe. The conductor casings will enable the <br />' drilling of future soil borings or vapor extraction wells in the new tank cavity area. The space <br />' in the new tank cavity surrounding the tanks and conductor casings was backfilled with imported <br /> pea gravel, <br /> FiOIAC <br /> INC— ® 4 Doc #A158W01 17 <br /> i <br />