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20 December 2001 <br /> AGE- - <br /> NC Project iVa 01 0$27 <br /> Page 5 of 8 <br /> I (shallow) and VW-5d (deep) The depths to ground water are summarized in Table 3 <br /> After ground water depth measurements were recorded, a minimum of three well casing-water <br /> volumes ofground water were purged from wells MWA,MW-3,MW-5,VW-1,VW-2 and VW-5D <br /> The monitoring wells were purged using a pre-cleaned two-stage submersible pump The vapor wells <br /> were purged using a pre-cleaned disposable, dedicated polyethylene bailer Temperature, pH, and <br /> conductivity were measured at regular intervals using an Oakton model water analyzer Purged water <br /> was stored on-site in 55-gallon drums The field data streets are included in Appendix C <br /> 2 8 GROUND WATER SAMPLE COLLECTION <br /> After purging and allowing a minimum 60%inwell VW-5d and 80%recharge recovery of the initial <br /> water leve]in all other wells,samples were collected using new,clean,disposable plastic bailers Each <br /> sample was transferred into three 40-m1 EPA-approved volatile organic analysis(VOA)vials and one <br /> 1-liter amber bottle Samples were stored in a chilled container and transported under chain-of <br /> Fb custody to PET <br /> Each sample was analyzed for <br /> • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, <br /> • BTEY compounds and fuel oxygenated compounds -, tertiary butanol (TBA), di-isopropyl <br /> ether (DIPS), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE, <br /> methanol, ethanol, 1,2-Dichioroethane (1,2-DCA) and ethylene dibromide (EDB) by EPA <br /> Method 8260 Modified <br /> 3.0 FINDINGS <br /> AGE determinedg round water flow direction and gradient from the field data collected on 10 <br /> October 2001, the contaminant impact to ground water was assessed from the laboratory data <br /> The SVE unit typically operated at an average 110 cubic feet per minute(cfn)during the period and <br /> the 1AS unit operated to increase dissolved oxygen in the ground water The mass of TPH-g <br /> extracted by the SVE system was calculated to be approximately 38 kg <br /> 3 1 SOIL-VAPOR EXTRACTION <br /> • The SVE unit operated at 115 cfm An induced vacuum (negative pressure) of approximately 23 <br /> Advanced GeoEnvironmental,Inc <br />