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� CAMBRIA <br /> long-term SVE testing of wells VE-1 and VE-2 at the optimal extraction rate However, as <br /> discussed below, a lesser vacuum was used because it was determined to be effective and more <br /> likely to be maintainable throughout the duration of the long-term test Long-term testing lasted <br /> approximately 5 days, as allowed by the San Joaquin Valley Air Pollution Control District A <br /> pernut was not required <br /> The test was performed with a positive displacement (PD) blower as the extraction device and <br /> carbon filtration as the vapor treatment device Cambria periodically measured the vapor <br /> extraction flow rate,the applied vacuum at the wellhead, hydrocarbon concentration in the vapor <br /> stream, and the vacuum influence in nearby wells Vapor samples were periodically collected for <br /> laboratory analyses <br /> Equipment A Honba hexa J-series hydrocarbon analyzer, calibrated to iso-butlylene, was used <br /> to field measure hydrocarbon concentrations in the extracted vapor stream A TSI model 8330 <br /> velocity meter was used to measure vapor extraction flow rates A Thomas Industries vacuum <br /> pump was used to collect the vapor samples Vapor samples were collected in one-liter Tedlar <br /> bags Magnehelic differential pressure gauges were used to measure the vacuum applied at the <br /> wellhead and induced in nearby wells <br /> Chemical Analyses Vapor samples were analyzed for TPHg, BTEX, and MTBE by EPA <br /> Method 8260E <br /> SOIL VAPOR EXTRACTION TEST DATA <br /> The SVE test data is summarized in Tables 2 and 3 Laboratory analytical results are included in <br /> Appendix B Field data sheets are included as Appendix D Details of the November 2001 test <br /> are presented below <br /> November 26, 2001 A vacuum of 60 inches of water column (mH2O) was applied to well VE-1 <br /> for a period of 20 minutes The vacuum was then increased to 70 mH2O for another 20 minutes <br /> of extraction The vacuum was finally increased to 78 mH2O for an additional 20 minutes of <br /> extraction This short-tern testing of well VE-1 yielded an optimal extraction rate of 33 5 cubic <br /> feet per minute (cfm) at a vacuum of 78 mH2O Cambria observed a maximum induced vacuum <br /> of 2 0 mH2O at well VE-2, located 14 feet from well VE-1 Cambria observed a maximum <br /> induced vacuum of 0 55 inH2O at well MW-5, located 7 feet from well VE-1 <br /> i <br /> 1346 5 <br />