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r <br /> r <br /> CALCULATION OF HYDROCARBON MASS ADSORBED TO SOIL <br /> rRanch Market- Riverbank <br /> 23569 South Santa Fe Road <br /> rRiverbank, CA October 11, 2000 <br /> rThese mass calculations were conducted based on data presented in Figures 5, 6, and 9 and Table 1 <br /> r AREA 1 1,020 sq ft area from 15 to 20 ft bgs area where vertical migration of release is assumed to <br /> have occurred beneath the tank pit Estimated avg concentration is 15,650 mg/kg <br /> r AREA 2A Same 1,020 sq ft area underlying tank pit as AREA 1 from 20 to 30 ft bgs Estimated avg <br /> concentration is 707 mg/kg <br /> r AREA 2B Same 1,020 sq ft area underlying tank pit as AREA 2 from 30 to 35 ft bgs Estimated avg <br /> concentration is 17 mg/kg <br /> r AREA 3 Remainder of area with detectable TPHg outside of AREA 1 & 2 (approx. 3,500 sq ft) <br /> Average concentration is this area based on soil data is approximately 43 mg/kg <br /> rAREA 1 AREA 2A AREA 2B AREA 3 <br /> rCONTAMINANT TPHg TPHg TPHg TPHg <br /> X- CONTAMINANT CONCENTRATION (mg/kg) = 15,650 707 17 43 <br /> rD - AVERAGE SOIL DENSITY (lbs/ft^3) = 129 129 129 129 <br /> rA - IMPACTED AREA (ft^2) = 1,020 1,020 1,020 3,500 <br /> H -HEIGTH OF IMPACTED AREA (ft) = 5 10 5 20 <br /> (15-20) (20-30) (30-35) (15-35) <br /> P- POUNDS OF CONTAMINANT (lbs) = 10,294 930 11 388 <br /> IEstimated Total Mass of Adsorbed Hydrocarbons: 11,624 pounds +/- 50% =(5,600 to 16,900) <br /> Estimated Volume of Adsorbed Hydrocarbons: 1,661 gallons +/- 50% = (800 to 2,400) <br /> I <br />