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b p <br /> f A S S O C I A T E S I N C <br /> 4.1.2 Results <br /> Results and field readings from the long-terra vapor extraction, air sparge, and vapor <br /> extraction/air sparge tests performed on May 17 and 18 are summarized in Tables 2, 3, and 4 <br /> Copes of field notes are contained in Appendix B Copes of laboratory reports are contained in <br /> tAppendix C <br />' During the vapor extraction test, extraction flowrates ranging from 8 3 to 12 2 cfm resulted in <br /> vacuums of up to 0 04 inches of water in wells VW2 and MW1 located 30 feet from the <br /> extraction well Vacuums of up to 00 01 and 0 03 inches of water were observed in wells MW3 <br /> and MW2 located 3.8 and 44 feet away, respectively Influent VOC vapor concentrations <br /> monitored with a flame ionization detector were measured at greater than 1 0% resulting in a <br /> flame out in the FID meter Lack of oxygen in the airstream prevented additional measurements <br /> Laboratory results of the vapor samples indicated that volatile hydrocarbons were detected in the <br /> influent samples Approximately 2 08 pounds of TPHg was removed during the vapor extraction <br /> pilot test as shown below / ! ! f '� / i <br /> ry� <br /> Concentration of TPHg in vapor sample � � ottk fJ,,,,. ,nseb 14 a rPP <br /> v 1°a , <br /> = 13,500 mg TPHg x 1 g x 1 mole TPHg x 22 414 1 vapor x 1 m3 x 1cm3 x 1,000MI <br /> M3 1,000 mg 100g 1 mole TPHg 106 cm3 1 ml 1 1 <br /> = 3,025 = 3,025 ppmv <br /> 106 <br /> ssuming an average flowrate of 10 3 cfm during the vapor extraction test yields <br /> = 3,025 1 TPHg x 10 3 ft3 x 60 mm x 28 32 I air x 1 mole TPHg x 100q x 1 lb <br /> 1,000,000 1 air min 1 hour 1 ft3 22 414 1 vapor mole TPHg 454 g <br /> = 0 52 Ib TPHg = 2 08 lbs of TPHg during the four hour test <br /> hour <br />' Laboratory results of the effluent vapor sample indicated a destruction efficiency of �? <br /> approximately 96 percent for benzene and over 99 percent for all other constituents analyzed <br /> During the air sparge test, injection flowrates of 6 cfm resulted in detectable concentrations of <br /> helium in wells MW2, VWI, and VW2 located 30 to 44 feet away from injection well MW1 <br />' C�ng the vapor extraction/air sparge combination test, extraction flowrates ranging fro 5 8 to <br /> fm resulted in a vacuum of up to 0 02 inches of water in well MW3 located 38 feet from the <br /> l extraction well Influent VOC vapor concentrations monitored with a flame ionization detector <br /> were measured at greater than 1 0% resulting in a flame out in the FID meter Lack of oxygen in <br /> W 1625961reportslpt1otcap doe 6 <br />