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Geocon Project No.59800-01-01B <br /> September 30,2013 <br /> Page 1 of 1 <br /> i <br /> TABLE 1 <br /> RESIDUAL MASS CALCULATIONS-TPHg IN SOIL <br /> CALTRANS STOCKTON YARD <br /> 1604 South B Street,Stockton,Califomia <br /> Calculation of Estimated TPHg Mass in Soil <br /> Estimated Mass of constituent(kg)=Volume of impacted soil(113)x Soil Density*(kg/ft) <br /> x Mean Constituent Concentration(mg/kg)x Conversion(10'6 kg/mg) <br /> Area of Impacted Thickness of Impacted Volume of Impacted TPHg Mass Estimate <br /> Depth(feet) Soil(ft) Soil(ft) Soil(ft3) (mg/kg) (kg) <br /> 14 to 40 194 26 5,044 2,000 " 538' <br /> Notes: <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> UCL=Upper Confidence Limit <br /> kg=Kilograms <br /> ft=Feet <br /> kg/113=Kilograms per cubic feet <br /> mg/kg=Milligrams per kilogram <br /> kg/mg=Kilograms per milligram <br /> " =Concentration reported for sample UST1-1 collected from the UST excavation area <br /> *Soil density in kg/ft3 =53.3 <br /> (estimated based on soil type-sandy silt) <br /> i <br />