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. MASS-VOLUME CALCULATIONS Bob's Muffler Shop 466 Moffat Boulevard, Manteca, California INTRODUCTION The following is the calculated volume and mass of petroleum hydrocarbons in soil and ground water for the site located at 466 Moffat Boulevard, Manteca, California. Figures 1 and 2 provide geographic location and on-site structures, monitoring well and boring locations. SOIL MASS-VOLUME CALCULATIONS Assumptions: • Utilizing Figures 3 and 4, the mass distribution of total petroleum hydrocarbon concentrations on-site can be approximated by four contoured zones, with the inner zone containing the highest TPH-g concentrations and the outer zone containing the lowest. The volume of the inner zone can be approximated utilizing a cone;the volume of the other zones were approximated utilizing an elliptical cone and block shapes. The volume of a cone can be calculated by the formula: V = 113 n r h, where"r" is the radius of the cone and"h" is the height of the cone. The volume of the other zones can mostly be calculated by the formula for an elliptical cone: V= 113 n a b h,where"a"is the shortest distance from the center, "b" is the longest distance from the center and"h" is the height of the cone. To be calculated accurately,zone three must be split into two areas and combined. The first can be calculated using the above formula for an elliptical cone. The second volume can be calculated by the block formula: V= a b h, where"a"is the length of the short side, "b"is the length of the long side and "h" is the height of the zone. 1) For the estimated inner zone (500 mg/kg contour line): r= 16.5 ft and h= 6.6 ft 2) For the estimated second zone (100 mg/kg contour line): a= 41.8 ft, b = 62 ftand h=9.75 ft. • Advanced GeoEnvironmental,Inc.