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i <br />' Appendix F Lathrop Gas and Food Mart <br /> Page 2 of 2 <br /> 1 <br /> For the volume of TPH-impacted soil (VT) within the 100 mg/kg isosurface, VT is the sum of a <br /> ' 100 mg/kg cylindrical volume A, a 100 mg/kg %2-cylindrical volume B, and a 100 mg/kg elliptic <br /> cone volume C (Refer to above figure and Table B 1) <br /> ' V (A) =AxL= 7zWL <br /> V (B)= %2AxL= '/snR2L 1 <br /> V (C) = %2AxL= 1/anabL <br /> Since we are calculating the volume of TPH (VT) between the 1,000 mg/kg and 100 mg/kg <br /> isosurfaces, we must subtract the volumes of the TPH-impacted soil inside the 1,000 mg/kg <br /> ' isosurface (V) <br /> Mass Determination <br /> The mass of TPH in soil is derived by converting the volume of TPH-impacted soil to weight,then <br /> multiplying the weight by the ratio of TPH to soil The density of soil is approximately 120 IV — 7 <br /> Assuming the average concentration of TPH in soil between the 1,000 mg/kg and the 100 mg/kg <br /> isosurfaces is 550 mg/kg, or 0 00055, then <br /> Mass of TPH=Vo x 125 lb/ft' x 0 00055 <br /> TPH Volume <br /> ' The volume of petroleum hydrocarbons is determined using a conversion factor of 6 25 lb per gallon <br /> for gasoline, or 7 0 lbs per gallon for diesel <br /> ' E g ,Volume of TPH-g=TPH-g(lb) –6 25 lb <br /> Additional Conversion Factors <br /> ' 27 ft3= 1Y d3 <br /> 1 yd' soil= 169 tons <br /> ' 1 kg = 2 2046 lbs 111 <br /> 1 gallon gasoline 6 25 lbs <br /> ' 1 gallon#2 diesel 7 00 lbs <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />