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- FARR ASSOCIATES <br /> Upon completion of the soil gas survey, locations with the highest VOC vapor.concentrations <br /> were selected for soil sampling. In addition, soil samples were collected downgradient of <br /> Tanks 1 and 2 (SVB-1) to confirm the negative soil gas results. Soil samples were obtained at <br /> discrete intervals using a standard 2 inch outer diameters lit barrel sampler.equipped <br /> ,. P p with a <br /> hardened steel tipped piston assembly capable of holding 6-inch brass sample sleeves (1.5 inch <br /> ' diameter). At the designated depth, the piston was released and the probe string advanced to <br /> collect the required interval. The string was then removed from the ground; and the sampler r <br /> disassembled. The sleeves were removed, capped and labeled, and the sampler <br /> decontaminated. All soil samples were sent to a state certified lab (American Environmental <br /> r <br /> Network, Pleasant Hill) and analyzed for BTEX using EPA Method 8020, and TPH-g using <br /> EPA Method.8015 modified. Soil samples collected adjacent to Tank #3 were also analyzed <br /> fill <br /> for TPH-d and TPH-k- Six of the soil samples were also sent to Core Laboratories and tested <br /> for physical properties and total organic carbon (TOC). This information may be used in <br /> support of chemical fate and transport modeling, if necessary, to move the site toward closure. <br /> f � ' <br /> Upon completion of sampling, the drive train was used to backfill the hole with <br /> cement bentonite grout while the drive train was being retracted from the hole. All equipment <br /> was decontaminated prior to use at the site and between each sampling location. <br /> Soil Sample Results - <br /> Soil samples were collected adjacent to Tanks'l and 2 at SVB-1 in order to confirm the <br /> negative results obtained during the soil gas survey. Samples were collected at 15 and.30 feet <br /> bgs. The shallow sample was non-detect for BTEX and TPH; the deeper sample yielded non- <br /> detect for BTE and TPH, and total Xylenes at 6 yg/kg. This result is just above the reporting <br /> J P ng ! <br /> limit of 5 uglkg. <br /> Fi <br /> A soil gas sample was unable to be collected from SV-7 at 30 feet bgs due to no-flow <br /> conditions. Therefore, a soil sam le was coIlecte P d and analyzed for BTEX and TPH. No <br /> petroleum hydrocarbons were detected in the sample. ' <br /> g1 f R41820A-625960-6 _ - -- <br /> uniooice/soilgas3.wpd 6 <br />