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TPH-G MASS CALCULATIONS - <br /> 7-Eleven Store No 20304 <br /> ' July, 1999 <br /> Sod Mass Calculation for TPH as gasoline (TPH-G)(Pounds) <br /> 1) Soil plume volume <br /> Area = 50 feet x 125 feet-862 feee [Excavated area (38 feet x 16 feet) + (18 feet diameter)] = 5,388 ftz <br /> Depth = 8 feet <br /> tVolume =V=43,104 ft3 <br /> 2) Sod weight <br /> One cubic foot of soil weighs an average of 124 pounds <br /> ' 43,104 ft3 x 124 = 5,344,896 lbs <br /> ' 3) Soil TPH-G concentrations <br /> Assume average concentration of 300 mg/kg TPH-G based on the summary of analytical data <br /> ' WS x CA= pounds hydrocarbons as TPH-G <br /> where WS= Weight of sod plume, and <br /> ' CA= average t do arts per million (1 x I O� <br /> V 5,344,896 lbs soil x 300 lbs1PH-G = 16 pounds of TPH-G <br /> 1,000,000 lbs TPH-G <br /> Dissolved Mass Calculation for TPH-G (Pounds) <br /> ' 1) Dissolved plume volume <br /> Width=60 feet x 30 feet <br /> ' Depth= 15 feet <br /> Volume=V= 27,000 ft' <br /> 2) Soil porosity= 40 percent(0 40) <br /> ' 27,000 ft3 x 0 4= 10,800 ft3 <br /> 1 1 ft3 of water= 7 5 gallons= 63 pounds of water <br /> 10,800 ft3 x 63 Ibs/f X 250 lbs TPHa = 0 0027 pounds of TPH-G <br /> 1,000,000,000 lbs TPH-G <br /> 1 <br /> 1 <br /> mascaig ex <br /> 1 <br />