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Geocon Project No.59800-01-01B <br /> September 30,2013 <br /> Page 1 of 1 <br /> TABLE 2 <br /> RESIDUAL MASS CALCULATIONS-TPHg IN GROUNDWATER <br /> CALTRANS STOCKTON YARD <br /> 1.604 SOUTH B STREET,STOCKTON,CALIFORNIA <br /> TPHg-January 2013-Figure 4 <br /> Soil Area Soil Thickness Soil Volume Pore Volume Pore Volume Pore Volume TPHg TPHg Mass TPHg Mass TPHg Mass TPHg <br /> (fe) (ft) (ft') (ft') (gal) (1) (mg/1) . (mg) (kg) (lbs) (gal): <br /> Isocon Interval:100 to 50014&d <br /> 4,912 37 181,744 63,610 475,839 1,801,245 0.24 432,299 0.43 0.95 0.15 <br /> Isocon Interval:>500 ug/1 <br /> 1,435 37 53,095 18,583 139,012 526,219 0.92 484,121 0.48 1.07 0.16 <br /> Total TPHg in Groundwater2.02 0.31 <br /> Notes: Assumptions: <br /> TPHg=total petroleum hydrocarbons as gasoline porosity=35% <br /> ft=feet TPHg density=6.5 lbs/gal <br /> gal=gallon , <br /> I=liter <br /> µg=microgram <br /> mg=milligram ) <br /> kg=kilogram <br /> lbs--'pound <br /> 1 <br /> I <br />