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17 October 1000 <br /> - r AGF.-NC Project No, 98-0450 <br /> Page 5 of 7 <br /> 3.0. FINDINGS <br /> The SVE unit typically operated at an average '300 cubic feet per minute (cfin) during the period and <br /> the IAS unit operated approximately a total of five hours daily. The: mass of TPT-I-g extracted by the <br /> SVF system was calculated to be approximately 1.070 gallons. <br /> 3.1. SOIL-VAPOR EXTRACTION <br /> lie SV1- unit operated at varying rates during the observation period. Extraction flow rates were <br /> calculated to range from 190 to approximately 200 cfm. An induced vacuum (negative pressure) of <br /> approximately 28 to 10 inches of water was measured in the piping between the blower and <br /> extraction wells. <br /> An induced vacuum of approximately 0.45 inches was measured at well BMW-1 and 2. a distance <br /> of 10 feet from the extraction wells. The SVE unit operation was continuous over the quarter. <br /> Hydrocarbon concentrations detected in influent soil-vapor samples were as follows: <br /> • 20 July 2000: TPH-g was detected at 10,000 j,�gll; benzene at 25 �tgll, toluene at 140 <br /> ethylbenzene at 53 pgll and total xylenes at 260 pg/l. .I <br /> • 29 August 2000: TPH-g was detected at 3.700 lcgll; ethylbcnzciic at 10 Loll and total xylcnes <br /> at 12 Ugll. <br /> • 26 September 2000: TPH-g was detected at 4,200 ug/l; benzene at 2.6 lig/l. toluene at 93 <br /> Vigil; ethylbenzene at 32 kigll and total xylenes at 190 ggll. <br /> The analvtical results are summarized on Table 2. The laboratory reports (MAT Sample Numbers: <br /> 43403. 43404. 46257. 46258. 48774 and 48775) Quality Assurance and Quality Control (QA/QC") <br /> reports and chain-of-custody farms are included in Appendix B. <br /> Hvdrocarbon concentrations measured in samples from the effluent stream in July and September <br /> indicated a minimc1111 95 percent rate of destruction. Concentrations of extracted organic vapor <br /> measured with the OVM were low compared to the analytical results from the soil-vapor samples. <br /> The highest concentration of organic vapor measured with the OVM was 1,795 ppm. <br /> Arhvrrrcrd GcuL:ncirunrncnlal,Lie. <br />