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FORMER AMERICAN FOREST PRODUCTS 4.0 Soil Conditions and Remediation <br /> Closure Summary Report Julv 2009 <br /> URS Project 17322736 Page 4-2 <br /> other VOCs were reported for any of the soil samples collected during the installation of monitoring wells <br /> DMW-10 through DMW-14. <br /> 4.3 MASS OF HYDROCARBON IN SOILS PRIOR TO AND FOLLOWING EXCAVATION <br /> Soils were characterized by an analysis of soil samples collected from soil borings conducted by Bechtel <br /> in 1985,Kleinfelder in 1987, and Dames &Moore in 1988 (Dames& Moore, 1994). The highest <br /> concentrations of TPIId were observed at the east and west ends of the former maintenance building at <br /> depths of 15 to 20 feet. TPHd concentrations decreased horizontally and vertically with distance from <br /> these apparent source areas. <br /> The mass of TPHd in soil prior to excavation was calculated for the depth range of 10 to 35 feet bgs, ° <br /> based on areas within isocortcentration lines of 100, 1,000, 5,000, and 10,000 mg/kg. The mass of <br /> excavated TPHd was based on the pre-existing concentrations and on excavation plans presented in the <br /> Soil Remediation and Groundwater Monitoring Work Plan (Dames& Moore, 1990). - <br /> Dames & Moore estimated(Dames & Moore, 1994)that, of the initial mass of approximately 51,700 <br /> pounds of TPHd in soil, approximately 24,200 pounds, or 47%,were removed. Approximately 27,500 <br /> pounds of TPHd, or 53%of the initial mass, were left in place. Of the soils left in place, approximately <br /> 88%had concentrations of TPHd below 5,000 mg/kg. <br /> K_`.N'process'_'_' 6 Anieric f"orest`Clusure-S=snmarv-teport-FtevOi.dc+c <br />