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subtracting the distance to the water surface in the well from the <br /> surveyed elevation of the reference point. <br /> Monitoring Well Sample Collection <br /> Monitoring wells will be allowed to stabilize for at least 48 hours after <br /> well development is completed and before groundwater sampling <br /> activities are initiated. One groundwater sample will be collected for <br /> laboratory analysis from each monitoring well. <br /> After well purging has been completed, water samples will be collected <br /> by lowering a decontaminated Teflon bailer into the well. Water <br /> samples obtained with the bailer will be immediately transferred to the <br /> pre-cleaned sampling containers provided by the analytical laboratory. <br /> Care will be taken to minimize any agitation of the water samples. <br /> Samples collected in volatile organic analysis (VOA) vials will be filled <br /> completely and capped with a Teflon septun lid such that zero <br /> headspace is achieved and no air bubbles are visible when the vial is <br /> inverted. <br /> All of the sampling containers used will be labeled with the site <br /> location, well number, date, time of collection, sampler's initials, and <br /> analysis required. Immediately after collection and container labeling, <br /> the sample will be chilled in a cooler for transfer to the analytical <br /> laboratory. Each sample will be logged on Chain-of-Custody forms and <br /> recorded in a field notebook. <br /> Samples will be delivered to the laboratory in an ice-filled cooler, <br /> accompanied by the appropriate Chain-of-Custody forms. <br /> Monitoring Well Sample Analysis <br /> Soil samples from UST Site 517 will be analyzed for TPH-diesel and <br /> TPH-gasoline by USEPA Method 8015 (Modified) and for BTEX by <br /> USEPA Method 8020. TPH samples will be prepared by USEPA Method <br /> 3550 using sonication. Soil samples analyzed for BTEX will be prepared <br /> using USEPA Method 5030 (purge and trap). TPH in soil samples will <br /> be analyzed and characterized by Gas Chromatography/Flame <br /> Ionization detection (GCFID) with a fused capillary column. In <br /> addition to the analyses mentioned above, soil samples from UST 816D <br /> and Sumps 617 and 816D will also be analyzed for VOCs, SVOCs, and <br /> PCBs. <br /> Soil samples will also be analyzed by the Waste Extraction Test (WET). <br /> The results of which will be used to evaluate site-specific threats to <br /> 4-9 <br />