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0 <br /> APPENDIX E <br /> ADSORBED MASS &VOLUME CALCULATIONS: PRE-EXCAVATION <br /> Sierra Lumber(Case No. 1) <br /> 375 West Hazelton Avenue, Stockton CA <br /> Pre-Remediation Impacted Soil Mass/Volume Assumptions: <br /> • Utilizing Figures 6 through 8, the pre-remediation mass distribution of total petroleum <br /> hydrocarbon quantified as gasoline (TPH-g) concentrations at the site can be estimated <br /> utilizing three (3) contoured zones of 10,000 mg/kg, 1,000 mg/kg, and 100 mg/kg. <br /> • Figures 6 through 8 were generated utilizing AutoCADTM drafting software.AutoCADTM has <br /> a specific function to calculate the area of a selected object, such as each area between the <br /> above referenced TPH-g isoconcentration intervals. Based on Figure 8, AutoCADTM <br /> determined the 10,000 mg/kg interval to be equal to 40.7 ft?,the 1,000 mg/kg interval to be <br /> equal to 242 W and the 100 mg/kg interval to be equal to 3,219.7 ft'. <br /> • The area and volume of each contoured zone can be estimated utilizing the AutoCADTM <br /> computer program to determine the area between the above referenced 10000, 1000 and 100 <br /> contoured zone intervals (Figure 8), and then multiplying the area by the height of the <br /> contoured zone as modeled from cross-sections A-A' and C-C' (Figures 6 and 7). <br /> The volume of the shapes can be calculated by the formula: <br /> V=AREA•h,where"area"is determined through AutoCadTM(Figure 8)and"h"is <br /> the maximum height of the contamination(Figure 6). <br /> The average TPH-g concentration in each zone was estimated by summing the contour <br /> isoconcentration lines and the soil samples within the selected area and dividing by the total number; <br /> the average from the inner zone (10,000 mg/kg) was determined by taking the average of BT-16 <br /> (14,000 mg/kg) and the 10,000 mg/kg contour line. Average TPH-g concentrations within each <br /> contoured zone(reported as milligrams per kilogram,mg/kg) are as follows: <br /> • >10,000 mg/kg✓The sum of BT-16 (14,000 mg/kg) and the 10,000 mg/kg contour line; <br /> average= 12,0.00 mg/kg(equivalent to 0.012)-K3 <br /> • 1,000-10,000 m ug: The sum of the 1,000 mg/kg contour line,the 10,000 mg/kg contour <br /> line, BT-21 (7,300 mg/kg), MW-30 (1,900 mg/kg), AW5-25 (1,700 mg/kg), MW2-25 <br /> (1,000 mg/kg); average=3,817 mg/kg(equivalent to 0.003817)X3 <br /> • 100 - 1,000 mg/kg : The sum of 134-25 (650 mg/kg), VWI-30 (590 mg/kg), BT-26 (400 <br /> mg/kg), MWl-25 (350 mg/kg), VW6-25 (260 mg/kg), 132-25 (220 mg/kg), AW5-35_130 <br /> mg/kg)the 1 000 mg/kg contour line and the 100 mg/kg contour line,average=411 mg/kg <br /> (0.000411) l� <br /> Advanced GwEnvironmental,Inc. <br />