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MASS CALCULATIONS-GROUNDWATER <br /> Universal Forest Products <br /> Thornton, California <br /> Volume of Excavated Soil 687 tons <br /> Estimated Volume of 35 tons <br /> Residual Petroleum- <br /> Affected Soil <br /> Average VOLUME <br /> Contaminant Concentration Porosity Pore Water Excavation Water Total TPHd <br /> (ug1L) (°10) (gallons) (gallons) (gallons) (gallons) <br /> Initial TPHd 4,400 0.56 77,906 6750D 145,406 0.80 <br /> Residual TPHd 57,000 0.56 3,969 0 3,969 0.28 <br /> Note: <br /> 7_ Based on an excavation of 30 feet by 60 feet with approximately 5 feet of standing water. <br /> C�= <br /> i <br /> h <br />