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LFR Inc. <br /> The following 10 SVE wells are proposed for sampling (Figure 3): <br /> SVE-004 (north) <br /> SVE-014 (north central) <br /> SVE-033 (south) <br /> SVE-034 (south central) <br /> SVE-024 (east) <br /> SVE-029 (east central) <br /> SVE-011 (west) <br /> SVE-019 (western hot spot) <br /> SVE-017 (hot spot) <br /> SVE-027 (hot spot) <br /> Samples will be collected in pre-evacuated Summa canisters and analyzed by EPA <br /> Method TO-15. Purging of any ambient air within the sampling lines will occur prior to <br /> opening the evacuated Summa canister for collection of the sample. <br /> Once the sampling of the SVE wells has occurred, operation of the SVETS and <br /> sparging systems will be terminated for a period of approximately 45 days to allow the <br /> subsurface to equilibrate and return to static conditions. <br /> After 45 days, the SVETS will be restarted. Prior to restart, the same set of 10 SVE <br /> wells listed above will be re-sampled to assess whether Hazardous Substance <br /> concentrations within the vadose zone have rebounded under static non-operating <br /> conditions. Ambient air within the well and sampling lines will be purged a minimum <br /> of three casing volumes using a portable vacuum pump prior to sample collection. As <br /> with the baseline samples, samples will be collected in pre-evacuated Summa canisters <br /> and analyzed by EPA Method TO-15. <br /> 2.1.3 Proposed New Soil-Gas Sampling Points <br /> LFR also proposes to collect soil-gas samples from five new locations approximately <br /> equidistant between two SVE wells. The purpose of these five soil-gas sampling points <br /> will be to assess Hazardous Substance concentrations at locations removed from the <br /> active extraction wells. Samples will be collected from depths of approximately 5, 10, <br /> and 20 feet below ground surface using direct-push technology at each of the five soil- <br /> gas sample locations. Soil-gas samples will be analyzed for Hazardous Substances using <br /> EPA Method TO-15. The proposed soil-gas sampling locations are shown on Figure 3. <br /> This sampling will be performed while the SVETS system is off. <br /> 2.2 Phase IV Sparging System Assessment <br /> The 10 groundwater monitoring wells located within the sparge area footprint (wells <br /> PT-1 through PT-10; Figure 4) have been sampled approximately eight times since <br /> sparging began in April 2007 and were sampled most recently in January 2009. LFR <br /> pimp lm=Phll_IV IRA-Aug09-06750.dm:deh •t`S <br />