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CLEARWATER <br /> G R O U P, I N C <br /> ' The assessment isr 1 <br /> p e iminary in nature, integrity tests and fuel inventory <br /> information provided no indication that products stored or dispensed at the site had <br /> ' been released to the subsurface. <br /> ' 2.0 INVESTIGATIVE METHODS <br /> 2.1 Soil Borehole Drilling and Soil Sampling <br /> On July 5, 1995, Clearwater supervised the drilling of two soil borings and the <br /> subsequent conversion of those borings into monitoring wells BMW-1 and BMW-2 <br /> (Figure 2) The two wells were drilled in locations believed to be downgradient of <br /> the USTs and dispensers, the groundwater gradient was assumed to be consistent <br /> ' with the gradient measured and reported during the FDIC site investigation. Total <br /> depths of the wells, 68 feet below ground surface (bgs), were also selected to be <br /> consistent with the depths of monitoring wells at the FDIC site <br /> Drilling was conducted by Mitchell Drilling Environmental Corporation (NME),E), a <br /> state-licensed drilling contractor MDE used a CME-75 drill rig equipped with 10- <br /> inch-diameter hollow-stem augers to drill the soil borings to a depth of 68 feet bgs <br /> All downhole equipment was steam-cleaned between borings to prevent cross- <br /> contamination <br /> 1 Soil samples were collected at 5-foot intervals b d <br /> P yrivin g a California-modified spilt <br /> spoon sampler ahead of the lead auger The sampler was lined with three 2 5-inch- <br /> diameter brass samples tubes, each six inches long As samples were retrieved from <br /> each sample depth, soil was removed from one of the three brass tubes, sealed in a <br />' plastic bag, and screened in the field for organic vapors using a Sensidyne® model <br /> flame ionization detector (FID) During drilling, soil samples were visually <br /> examined, described, and classified by a Clearwater geologist according to the Unified <br /> Soil Classification System (ASTM D 2488-93) Sample locations, soil descriptions, <br /> and FID readings are shown on the boring logs presented in Appendix B <br />' One soil sample was selected_fram_each-sample_depth_for-laboratory-analysis The _ <br /> brass be was sealed with teflon-lined caps and placed in a cooler for shipment <br /> under chain-of-custody procedures Samples were analyzed by PACE Incorporated <br /> (PACE), a state-certified environmental laboratory located in Petaluma, California <br /> Soil samples were analyzed for the following petroleum hydrocarbon compounds <br /> C-115 PRE AR 10195 2 October 11,1995 <br />