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1 APPENDIX F 1 Volume-Mass Calculations Of Adsorbed TPH gasoline MBP NAVY-2191 Navy Drive,Stockton,Ca ' Assumptions • Utilizing Figures 2 and 6, the hydrocarbon distribution on the site can be approximated by ' five contoured areas The volume of the areas can be approximated utilizing elliptic cones and a sphere ' The volume of an cone can be calculated by the formula V•=(n r''/h), 'Y' is the radius of the cone and"h"is the 1 height of the cone g The volume of a sphere can be calculated by the formula ' V.=413 n ?, where"r" is the radius of the sphere 1)Impacted soil at P3, elliptic cone (2 75 mg/kg average concentration) r Z 8 ft,h = 12 5 ft ' 2)Impacted soil at P9, elliptic cone (4 1 mg/kg ave concentration) r = 14 ft, h ;z 23 ft 3)Impacted soil at MW-6, a sphere(1 2 mg/kg ave concentration) r = 3 ft 4)Impacted soil at Tank 6 south, elliptic cone(270 mg/kg ave concentration) r Z 5 ft,h = 10 ft ' 5)Impacted soil at Tank 6 north, elliptic cone(43 mg/kg average concentration) r z3 ft, h = 10 ft The average TPH-g concentration in each zone was estimated by adding all soil samples within the 1 selected area and dividing by the total number of samples The two average concentrations(reported as milligrams per kilogram, mg/kg) were as follows 2 75 mg/kg (2 75x10 6) cone one, 4 1 mg/kg (4 1x10) cone two, 12 mg/kg (I 2x10) sphere, 270 mg/kg (2 7x10') cone four and 43 mg/kg ' (4 3x10')cone five 1) Approximate volume of petroleum hydrocarbon impacted soil in cone# 1(V.) ' Vo=(3 14)(8 ft)2(l/2(12 5 ft)) -*1,256 64 ft3 (lyd3/27ft3) = 46.5 yd3 ' Converting 46 5 yd3 to cm3(1 e lyd3=764,555cm)yields approximately 35,551,807 5 cm3 Using 1 6 g/cm3 as the weight of soil,the total weight of contaminated soil is approximately 56,882,892 g Using the 2 75 mg/kg as the"average"concentration of gasoline in the cone,the volume of gasoline 15 weight of soil • average concentration -4 56,882,892 g • 2 75x10 6= 156 42 g of gasoline Converting grams of gasoline to volume of gasoline (gallons) using density of gasoline to equal 0 75 g/cm3 156 42 g of gasoline- 0 75 g/crn3 =208 57 cm3 . 208 57 cm3 • (1 gallon-3,785 cm3) = 0.055 gallons of gasoline AdvmecedC.eoEnvtroamental,Tnc.