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R R 54 <br /> y <br /> 53, <br /> _ : gg <br /> ` 21 <br /> r <br /> s. a .. <br /> RON <br /> and extent of chemicals in the shallow groundwater prior to the <br /> installation of monitoring wells. <br /> Groundwater samples were collected from three of the monitoring <br /> wells after the wells had been developed. The wells were developed by <br /> surging and bailing 10 casing volumes from the wells. Water <br /> samples were collected using a Teflon bailer. Bailers used for <br /> development and sampling were cleaned prior to each use. <br /> Groundwater samples collected for BTEX analysis were immediately <br /> transferred to clean volatile organic analysis (VOA) vials, filling <br /> each completely. Care was taken to minimize any a With on of the <br /> a Teflon <br /> water sample. Each sample vial was then capped <br /> septum cap such that zero headspace is achieved, and no air bubbles <br /> are visible when inverted. <br /> F <br /> Groundwater samples collected for TPH analysis were transferred <br /> 1A into 1-liter amber glass containers. All the containers, VOA vials, <br /> and 1-liter amber glass used were labeled with the well number, <br /> date, time, sampler's initials, location, and analysis required, then <br /> i;q were chilled in a cooler. Each sample was logged on chain-of-custody <br /> forms and in a field book. The samples were held in the cooler, <br /> accompanied by the appropriate chain-of-custody forms until <br /> p delivered to the laboratory. <br /> Sample Analysis <br /> Soil samples were analyzed for TPH as diesel and gasoline by EPA <br /> h. Method 5015 modified and for BTEX by EPA Method 8020. Soil <br /> samples analyzed for TPH were prepared by EPA Method 3550 using <br /> + sonication. Soil samples analyzed for BTEX were prepared using <br /> EPA Method 5030 (purge and trap). Total petroleum hydrocarbons in <br /> soil samples were analyzed and characterized by Gas <br /> Chromatography/Flame Ionization Detection (GCFiD) with a fused <br /> capillary column. Water samples were analyzed for TPH as diesel <br /> and gasoline by EPA Method 8015 modified and for BTEX by EPA <br /> ' Method 602. <br />