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PETROLEUM HYDROCARBON MASS CALCULATIONS <br /> Ranch Market <br /> 23564 South Santa Fe Road <br /> Riverbank, California <br /> HYDROCARBON MASS DISSOLVED IN GROUNDWATER <br /> These mass calculations were made based on average high TPHg concentrations presented in Figure 10 <br /> and o n the 1st Quarter 2000 sample data summarized in Table 3 <br /> Assume impacted water column extends from 20 to 50 feet bgs, a thickness of 30 feet <br /> AREA 1 20,000 Ave TPHg Con in ppb 100 ft 120 ft 12,000 square feet <br /> AREA 2 2,000 Ave TPHg Con in ppb 150 ft 180 ft 27,000 square feet <br /> (Minus Area 1) 12,000 square feet <br /> 15,000 square feet <br /> AREA 3 200 Ave TPHg Con in ppb 210 ft 220 ft 46,200 square feet <br /> (Minus Area 2) 27,000 square feet <br /> 19,200 square feet <br /> AREA 4 100 Ave TPHg Con in ppb 330 ft 240 ft 79,200 square feet <br /> Minus Area 3 46,200 square feet <br /> 33,000 square feet <br /> AREA 1 AREA 2 AREA 3 AREA 4 <br /> CONTAMINANT TPHg TPHg TPHg TPHg <br /> X - CONTAMINANT CONCENTRATION (mg/L) = 20 000 2000 020 0 100 <br /> N - POROSITY (%) = 038 038 038 038 <br /> A - IMPACTED AREA (f A2) = 12,000 15,000 19,200 33,000 <br /> H - HEIGHT OF IMPACTED AREA (ft) = 30 30 30 30 <br /> P - POUNDS OF CONTAMINANT (lbs) = 171 21 3 2 <br /> Estimated Total Mass of Dissolved Hydrocarbons: 197.2 pounds+/-50% 98.62 to 295.87 lbs <br /> Estimated Volume of Dissolved Hydrocarbons: 28.2 gallons+1-50% 14.09 to 42.27 gal <br /> • <br /> File RanchMarket\Tables%Ranch-AreaMass-1 xls Page 2 of 2 <br />