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1 = <br /> 1� <br /> A S S O C I A T E S I N C <br /> = <br /> 651,341 Liters x 0 17 mg = 110,728 mg/day or 0 24 pounds/day of TPHg <br /> day Liter <br /> Using the same calculation for benzene yields <br /> ' =L32 m Im3 + 47 m Im3+40 mg/m3 + 11 mg/m3) = 32 5 mg/m3 benzene average concentration <br /> 4 <br /> ' = 32 5 mg_ x m3 x ft3 - 0 03 mg/L <br /> M3 355 ft3 28 27 Liter <br /> = 651,341 Liters x 0 03 mg = 19,540 mg/day or 0 04 pounds/day of benzene <br /> day Liter <br />' 7.0 SOIL AND PURGE WATER DISPOSAL <br /> On July 25, 2001, ATC transported and disposed of 38 55-gallon drums containing soil cuttings <br /> from the installation of wells MW1 through MW8 The soil was transported and disposed of at <br /> the Forward Landfill in Stockton, California On October 29, 2001, ATC supervised the <br /> transport and disposal of approximately 16 tons of soil generated from the installation of on-site <br /> M wells On November 28, 2001, ATC supervised the transport and disposal of approximately 12 <br /> tons of soil generated during the trenching required for the pilot testing The soil was transported <br /> and disposed of at the Forward Landfill in Stockton, California Copies of the non-hazardous <br />' waste manifests are included in Appendix H <br /> On November 26, 2001, ATC supervised the transport of 2,150 gallons of non-hazardous liquid <br /> waste purged from the groundwater wells during recent quarterly monitoring events On January <br /> 23, 2002, ATC supervised the transport of 300 gallons of non-hazardous liquid waste purged <br />' from groundwater wells during pilot testing and fourth quarter 2001 monitoring events <br /> American Valley Waste Oil transported the waste to the Seaport Environmental disposal facility <br /> in Redwood City, California Copies of the non-hazardous waste manifests are contained in <br />' Appendix H <br /> 8.0 DISCUSSION <br />' The soil vapor extraction pilot test yielded a ROI of approximately 50 feet As shown in Section <br /> 5 2, approximately 13 7 pounds of TPHg and benzene were removed during the 6-hour combined <br /> vapor extraction pilot tests Soil vapor extraction appears to be a viable method for remediating <br /> TPHg and BTEX impacted soil at the site In ATC's experience, soil vapor extraction is also a <br /> moderately effective method for remediating TPHg and BTEX impacted groundwater The <br />' effectiveness of soil vapor extraction is expected to increase when used in conjunction with air <br /> 1 sparging <br /> w 1163931reportslrifs doe 16 <br />