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Environmental <br /> Mr Harlin Knoll Resources <br /> 14 August 1998 Management <br /> Page 5 <br /> a boring (B-2) was advanced at the former tank location during a <br /> previous investigation, this boring was terminated at 215 feet bgs and <br /> the analytical results of the sample collected at this depth indicated the <br /> presence of BTEX and TPH-g at low concentrations To further <br />' investigate the extent of TPH-g impact to soil at depth and the potential <br /> impact of TPH-g to ground water, boring B-5 was advanced adjacent to <br />' B-2, and soil sampling was initiated below the deepest boring 13-2 sample <br /> at a depth of 25 feet bgs Soil samples were collected every 5 feet from <br /> 25 feet bgs to the termination of the boring at 415 feet bgs A <br /> "hydrocarbon-like odor" was noted in the soil samples collected from 26, <br /> 315, and 36 feet bgs A grab ground water sample was collected <br /> between the depths of 41 to 44 feet bgs using a HydroPunch device <br />' Soil boring B-6 was installed approximately 15 feet downgradient of <br />' boring B-5 to assess the lateral extent of TPH-g impact to soil and <br /> possibly ground water Soil samples were collected every 5 feet from <br /> ground surface to the bottom of the boring at 415 feet bgs No <br /> hydrocarbon-like odors were noted in the soil samples or grab ground <br /> water samples collected from boring B-6 A HydroPunch ground water <br /> sample was attempted from 40 to 44 feet bgs at B-6, but yielded no water <br />' due to the low permeability of the silty clay present below 40 feet bgs <br /> The borehole was then temporarily cased with polyvinyl chloride (PVC) <br /> well casing from 35 to 40 feet bgs and a grab ground water sample <br />' collected with a disposable bailer <br /> The scope of work stipulated that additional soil borings were to be <br /> advanced downgradient of boring B-6 if field evidence indicated that soil <br /> in this downgradient boring was impacted All soil PID results were less <br />' than 10 ppm between 20 and 40 feet bgs at boring B-6 and there were no <br /> visual indications of hydrocarbon impact In addition, ground water PID <br /> readings were elevated at boring B-5 and less than 5 ppm at boring B-6, <br />' suggesting localized ground water impact Therefore, in accordance <br /> with the Workplan, no additional borings were advanced <br /> Collection of Soil Samples <br /> I, <br /> Soil samples were collected by driving an 18-inch-long split-spoon <br /> sampler containing three 6-inch-long clean brass liners into the soil <br /> Upon removal from the borehole, the brass liners were removed from the <br />