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PETROLEUM HYDROCARBON MASS CALCULATIONS <br /> Ranch Market <br /> 23569 South Santa Fe Road <br /> Riverbank, California <br /> HYDROCARBON MASS ADSORBED TO SOIL <br /> These mass calculations were conducted based on data presented in Figures 5, 6, and 9 and Table 1 <br /> Assume the total mass of BTEX is insignificant when compared with the total TPHg mass <br /> Under Tank Pit AREA 1 20 ft 35 ft 700 square feet <br /> Under and outside tank pit AREA 2 50 ft 60 ft 3,000 square feet <br /> Under and outside tank pit AREA 3 50 It 85 ft 4,250 square feet <br /> Outside and of tank pit 85 ft 135 ft 11,475 square feet <br /> Corrected (minus AREA 3) AREA 4 75 ft 120 ft 1 7,225 square feet <br /> AREA 1 700 Sq ft from 10 to 15 ft Estimated average TPHg concentration 1500 ppm <br /> AREA 2 3,000 Sq ft from 15 to 25 ft Estimated average TPHg concentration 6000 ppm <br /> AREA 3 4,250 Sq ft from 25 to 35 ft Estimated average TPHg concentration 200 ppm <br /> AREA 4 11,475 Sq ft from 25 to 30 ft Estimated average TPHg concentration 20 ppm <br /> AREA 1 AREA 2 AREA 3 AREA 4 <br /> CONTAMINANT TPHg TPHg TPHg TPHg <br /> X - CONTAMINANT CONCENTRATION (mg/kg) = 1,500 6,000 210 30 <br /> D -AVERAGE SOIL DENSITY (lbsK03) = 129 129 129 129 <br /> A - IMPACTED AREA (ft^2) = 700 3,000 4,250 7,225 <br /> H - HEIGHT OF IMPACTED AREA (ft) = 5 10 10 15 <br /> (15-20) (20-25) (25-30) (30-35) <br /> P - POUNDS OF CONTAMINANT(lbs) = 677 23,216 1,151 419 <br /> Estimated Total Mass of Adsorbed Hydrocarbons: 25,464 pounds+l- 50% 12,732 to 38,195 lbs <br /> Estimated Volume of Adsorbed Hydrocarbons- 3,638 gallons+l- 50% 1,819 to 5,456 gal <br /> i <br /> Fite RanchMarkeffables\Ranch AreaMass 1 As Page 1 of 2 <br />