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ADSORBED MASS & VOAPPENDIX H
<br /> LUME CALCULATIONS: PRE-EXCAVATION
<br /> Masonite (Former Prem Dor)
<br /> 433 West Scotts Avenue, Stockton CA
<br /> Pre-Excavation Assumptions: '
<br /> • Utilizing Figures 6 through 8, the pre-excavation mass distribution of total petroleum I
<br /> hydrocarbon (TPH) concentrations at the site can be estimated utilizing four(4) contoured
<br /> zones of 10,000 mg/kg, 1,000 mg/kg, 100 mg/kg and 1 mg/kg. !
<br /> Figures 6 through 8 were generated utilizing AutoCADTM drafting software. The volume of
<br /> each contoured zone can be estimated utilizing the AutoCADTM computer program to
<br /> determine the area between each contoured zone (Figure 8), and then multiplying the area
<br /> by the height of the contoured zone as modeled from cross-sections D-D' and E-E' (Figures
<br /> 6 and 7).AutoCADTM has a specific function to calculate the area of a selected object, such
<br /> as each area between the above referenced TPH isoconcentration intervals.
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<br /> The volume of the shapes can be calculated by the formula:
<br /> V=AREA-h,where"area"is.determined through Autocad (Figure
<br /> the maximum height of the contamination (Figure 6) TM 8)and"h"is E
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<br /> The average TPH concentration in each zone was estimated by summing the contour f
<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 m �
<br /> (22,000 m fig) was determined by taking the average of B2-15 I
<br /> fig) and the 10,000 mg/kg contour line. Average TPH concentrations within each
<br /> contoured zone (reported as milligrams per kilogram, mg/kg) are as follows:
<br /> • >10,000 mg/kg : The sum of B2-15 (22,000 mg/kg)
<br /> a /k g g) and the 10,000 mg/kg contour line;
<br /> average= 16,000 m 4
<br /> g g (equivalent to 0.016). • �
<br /> • 1,000-10,000 mg/kg : The sum of the 1,000 m
<br /> line, TK1-9 (1,700 m �g contour line,the 10,000 mg/kg contour i
<br /> mg/kg), TK2-10 (4,700 mg/kg), B1-20 (2,500 mg/kg), NW-18 (2,200
<br /> mg/kg),EW-18(1,200 mg/kg),Bott.N-25(2,000 mg/kg),NEW-18 (1,100 mg/kg);average
<br /> =2,933 mg/kg (equivalent to 0.002933). j
<br /> • 100 - 1,000 Mg/kg : The sum of B3-35 (900 mg/kg), the 1,000 mg/kg
<br /> g g ' I
<br /> 100 mg/kg contour line, average=667 mg/kg (0.000667). contour line and the
<br /> • 1 - 100 Mg/kg : The sum of the 100 m �
<br /> g g ' mg/kg contour line, the 1 mg/kg contour line,132-35 (3 r
<br /> mg/kg), B4-25 (12 mg/kg), MW2-35 (1.8 mg/kg),.SW-18 (50 mg/kg), SW-25 (1 mg/kg);
<br /> average=24 mg/kg (equivalent to 0.000024).
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<br /> Advanced GeoEnvironmental,Inc.
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