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' 17 May 2006 . AGE-NC Project No 03-1071 ' Page 2 of 5 at 30-minute Intervals from surrounding observation points (VW-2, VW-3, VW-4, MW-1, MW-2 ' and MW-3) which were pre-connected with air-tight well caps and Dwyer Magnehelic vacuum gauges fitted to each observation well During the test, soil-vapor extracted from well VW-1 was monitored at the inlet of the vacuum blower for organic vapor and for flow rate Organic vapor concentrations were measured(parts per million)utilizing a portable organic vapor meter(OVM)equipped with a PID(PID Microtip model 1000 calibrated to isobutylene) Flow rate was monitored using a Dwyer DS-200 flow sensor(inches of water),the flow rate was converted to SCFM using a manufacturer supplied conversion chart The ' organic vapor concentrations and flow rates were measured at 30-minute intervals and logged on field sheets, OVM and flow field measurements are summarized in Table 1 ' 22 SVE PILOT TEST SAMPLING AND ANALYSIS ' A total of five soil-vapor samples were collected during the pilot test Soil-vapor samples were collected at two-hour intervals from a sample port near the inlet of the vacuum blower to measure hydrocarbon concentrations in the extracted soil-vapor The samples were collected in Tedlar bags using an electric air pump Samples were transported in a chilled container under chain-of-custody to Cal Tech Environmental Laboratories,a California Department of Health Services(DHS)-certified laboratory Each sample was analyzed within 72 hours for ' Total petroleum hydrocarbons quantified as gasoline (TPH-g), benzene toluene ethylbenzene, and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) in accordance with EPA Methods 8015M and 8260B ' 23 SVE PILOT TEST FINDINGS ' Analytical results of soil-vapor samples and pilot test results are based on field data collected on 12 April 2006 1 2 3 1 Analytical Results of Soil-Vapor Samples TPH-g was detected in the Influent soil-vapor samples at concentrations ranging from 8,400 micrograms'per liter (µg/l) to 12,000 µg/l, benzene, toluene, ethylbenzene and total xylenes were detected in the soil-vapor samples at concentrations as high as 4 7 µg11 benzene, 12 µg/l toluene, 58 µg/l ethylbenzene and 200µg/l total xylenes,MTBE was detected at concentrations ranging between . 4,000 µg/l and 5,000 µg/1 Effluent soil-vapor samples did not detect any constituents of concern Advanced GcoEnvironmental,Inc