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• Ms Margaret Lagorio Project 20805-152 008 <br /> October 12, 1998 <br /> Page 4 <br /> this volume for TPHG and BTEX was used to subtract this mass from the mass <br /> between 10 and 25 feet <br /> The mass of TPHG was calculated as follows <br /> Mass TPHG(lb) = Vol of TPHG X soil density (lb/0) X TPHG <br /> impacted soil (ft3) concentration <br /> (ppm) <br /> The estimated petroleum hydrocarbon mass (TPHG) using historical soil analytical results <br /> is approximately 229,000 pounds The estimated total BTEX mass is approximately <br /> 13,500 pounds The breakdown by soil interval is summarized below The calculations are <br /> presented in Appendix B <br /> Soil Interval Estimated Gallons TPHG Estimated <br /> • (ft-bgs) TPHG Mass BTEX Mass <br /> 10 to 25 ft 9,305 pounds 1,508 gallons 1,949 pounds <br /> 26 to 45 ft 121,877 pounds 19,753 gallons 9,873 pounds <br /> 46 to 65 ft 54,971 pounds 8,909 gallons 5,010 pounds <br /> 66 to 85 ft 42,821 pounds 6,940 gallons 659 pounds <br /> Totals 228,974 pounds 37,110 gallons 17,941 pounds <br /> conversion factor 1 pain-gasoline = 6 17gal�ortss <br /> �'a1� P0ti-r .5 <br /> STRATIGRAPHIC CONTROLS ON TPHG AND TOTAL BTEX DISTRIBUTION <br /> The site is underlain by primarily silt and clayey silt Boring logs refer to hard drilling <br /> conditions and locally cemented intervals Sand to silty sand lenses are locally present and <br /> do not appear to be laterally or vertically continuous At approximately 55 to 65 feet bgs, a <br /> series of discontinuous sand lenses were encountered that extend southeastward from the <br /> area located between the dispensers and USTs As shown on Figures 3 and 4, the vertical <br /> extent of impacts becomes progressively deeper toward the southeast and the sand lenses <br /> SACC 1LSG\2NDQTR--116100MASS DOC-961mtt t <br />