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27 September 2005 <br /> . AGE-NC Protect No 03-1100 <br /> Page 2 of 4 <br /> 2 2 COLLECTION AND ANALYSIS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> On 02 and 17 November 2004, 22 December 2004, 03 and 20 January,17 February, 08 March, <br /> 26 April, 09 May and 03 June 2005,'a vapor sample was-collected from the influent port of the SVE <br /> unit to measure concentrations of hydrocarbon vapor,and one vapor sample was collected from the <br /> effluent port to assure complete combustion was occurring The samples were collected in Tedlar <br />' bags using an electric vacuum pump <br /> Following sample collection,the samples were properly labeled,placed in a covered container and <br />' transported under chain of custody to CTEL Each sample was analyzed within 72 hours of <br /> collection for <br /> •, <br /> TPI -g in accordance with EPA Method 8015 Modified, and ' <br /> • BTEX and MTBE in'accordance with EPA Method 8260 <br /> 3.0 FINDINGS <br /> Analytical results of influent vapor samples,collected between November 2004 and June 2005,were <br /> used to calculate the volume of contamination removed during interim SVE <br /> 1 <br /> 3 1 RESULTS OF SOIL VAPOR EXTRACTION <br /> Between 02 November 2004 and 03 June 2005, the SVE remediation system was operational for <br />' approximately 4,451 6 hours During this operational period, differential pressures were observed <br /> to be between 2 4 and 9 4 inches of water at the SVE inlet which indicated the flow to be between <br /> 80 and 180 cubic feet per minute During the testing period, the induced vacuum rates at the well <br />' heads ranged between 16 and 26 inches of water Utilizing an organic vapor analyzer (OVA), <br /> hydrocarbon concentrations were measured at concentrations between 0 and 22 parts per million <br /> - - (ppm) at the SVE inlet Field measurements are summarized in Table 1 <br /> 3 2 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> TPH-g was detected in 8 of the 10 influent SVE air flow samples at concentrations ranging between <br /> 220 micrograms per liter (µg/1) and 14,000 µg11 <br />' Various BTEX constituents were detected in all ten influent SVE air flow samples at concentrations <br />' L Advanced GeoEnvnronmental,Inc <br />