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FARR ASSOCIATES <br /> collected at depths of 15, 30, and 45 feet bgs. The three sampling depths were selected to <br /> provide data to assess the vertical distribution of petroleum hydrocarbons. ' <br />�1 - <br /> li <br /> A direct-push hydraulic and percussion drive-point sampling system was employed to collect <br /> the soil gas samples. At the designated depth interval, the drive rods were slightly retracted to <br /> p g <br /> expose the slotted portion of the expendable drive-point. Tubing, which was lowered down <br /> the drive train as it was being advanced,'was purged prior to collecting the gas sample. Soil <br /> gas was withdrawn from the tubing using a small calibrated syringe connected to the tubing via <br /> an on-off valve. In order to ensure that a representative sample was being collected, the first 5 <br /> volumes of gas pulled from the tubing were discarded. The next 20 cc of soil gas were <br /> withdrawn in the syringe, plugged and immediately transferred to TEG's onsite mobile lab for <br /> analysis for BTEX using EPA Method 8020, and for TPH using EPA Method 8015 modified. <br /> Soil Gas Results <br /> TPH was detected at concentrations of 49 ppmv north of Tank 3 (SV-7 at 13.5 feet bgs), <br /> 10,570 ppmv immediately adjacent to Tank 3 (SV-5 at 40 feet bgs) and 8,208 ppmv south of <br /> Tank 3 (SV-6 at 44 feet bgs). Toluene (1.0 - 734.5 µg/L), Ethylbenzene (2.1 - 147.9 /,cg/L) <br /> ` and Xylenes (13.3 - 292.3 pg/L) were also reported at SV-5, SV-6 and SV-7 (see Figure 2 and <br /> Table 1). A soil gas sample was not able to be collected at 5V-7 at 30 feet due to no flow <br /> conditions. No compounds were detected adjacent to Tanks 1 and 2 (SV-1 and SV-2) or <br /> between Tanks 1 and 2 and Tank 3 (except for toluene which was detected slightly above the <br /> 1 reporting limit at 1.1 µg1 L from SV-3 at 30 feet bgs). No compounds were detected at SV-8, <br /> northwest of Tank 3. <br /> t <br /> Soil Sampling <br /> E � <br /> At the request of PHSIEHD, selected soil samples were collected as confirmation of soil-gas <br /> 1 � analytical results. A total of 8 soil samples were collected from 4 of the soil gas sample <br /> locations (SV1, SVS, SV6 and SV7) at depths of 15, 30, and/or 45 feet bgs. <br /> i <br /> TI <br /> S; <br /> R41820A-625960-5 5 <br /> � unionicn/soilges3.wpd _ <br /> 4 <br />