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25 January 2012 <br />AGE-NC Project No. 02-0926 <br />Page 2 of 7 <br />Volatile organic compounds benzene, toluene, ethylbenzene, xylenes (BTEX) <br />methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), diisopropyl ether <br />(DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) by <br />EPA method 8260B; and <br />Lead scavengers 1,2-dichloroethane and 1,2-dibromoethane (EDB) by EPA method <br />8260B. <br />Once the pilot test was initiated, startup influent and effluent vapor stream samples were <br />collected from the on-site SVE system. Vapor samples were collected from the influent and <br />effluent stream throughout the duration of the pilot test; an effluent sample was not <br />collected on the final day prior to pilot test termination. Samples collected were submitted <br />to CTEL for analysis of the following: <br />TPH-g by EPA method 8015M; <br />BTEX by EPA method 8260B; and <br />MTBE by EPA method 8260B. <br />Following the initiation of sparging, pressure and flow readings from the compressor and <br />DO and depth to water measurements were measured at each well location at two hour <br />intervals during each day of the test. <br />3.0. IN-SITU AIR SPARGE PILOT TEST FINDINGS <br />After initial breakthrough, pressures of approximately 15.5 and 16 pounds per square inch <br />(psi) and a flow of 1 to 2 standard cubic feet per minute (scfm) were maintained at the <br />compressor to the well. During the IAS pilot testing activities, DO measurements <br />(milligrams per liter and percentage) and pressure readings were collected from <br />observation wells MW-1 through MW-5 (Table 3). The following is a summary of findings: <br />DO was measured at concentrations ranging from 1.23 milligrams per liter (mg/I; <br />14.8%) to 3.54 mg/I (39.0%) in well MW-1; <br />DO was measured at concentrations ranging from 3.40 mg/I (39.5%) to 4.85 mg/I <br />(53.9 %) in well MW-2; <br />DO was measured at concentrations ranging from 0.35 mg/I (4.2%) to 1.71 mg/I <br />(18.5%) in well MW-3; <br />DO was measured at concentrations ranging from 3.88 mg/I (41.8 %) to 6.83 mg/I <br />(73.0%) in well MW-4; and <br />Advanced GeoEnvironmental, Inc.