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• CALCULATION SHEET H-1 <br /> SITE CALCULATIONS — HYDROCARBON MASS & CLEAN-UP TIME <br /> Former Canteen Facility <br /> 1500 Shaw Road <br /> Stockton, California <br /> CALCULATIONS <br /> 1 The concentration data in the 'Mass of Contaminant' section is calculated as the average <br /> of the concentrations from the impacted monitoring wells and borings <br /> 2 The mass of dissolved-phase hydrocarbons is calculated by <br /> M = Area x Thickness x Concentration x Porosity <br /> 3 The mass of sorbed-phase hydrocarbons (sat and vadose) is calculated by <br /> M = Area x Thickness x Density of Soil x Concentration <br /> 4 The mass of NAPL is calculated by <br /> M = Area x Thickness x Porosity x NAPL Density <br /> • 5 The mass of hydrocarbon in the vapor phase is calculated as <br /> M = Area x Thickness x Porosity x Vapor Concentration <br /> 6 The Flow Rates were either estimated or taken from modeling results <br /> 7 Mass removal data is calculated as <br /> M = Flow Rate x Concentration <br /> 8 Total mass of contaminant is calculated as the sum of the masses in each phase <br /> 9 Volume of soil is calculated by <br /> M = Area x Thickness <br /> 10 Time required to remove 1 pore volume is calculated as <br /> T = Volume 1 Vapor Flow Rate <br /> 11 Initial remediation rates were calculated as the mass removal rates for vapor, <br /> liquid, and NAPL <br /> 12 The estimated times for remediation were calculated by <br /> T = Total Mass 1 Initial Mass Removal Rate 1 Est Efficiency I System Up-Time <br />