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Geocon Project No.59800-01-OIB <br /> September 30,2013 <br /> Page 1 of 1 <br /> TABLE 3 <br /> RESIDUAL MASS CALCULATIONS=TPHd IN GROUNDWATER <br /> CALTRANS STOCKTON YARD MAINTENANCE STATION <br /> 1604 SOUTH B,STREET,STOCKTON,CALIFORNIA <br /> TPHd-January 2013-Figure 5 <br /> Soil Area• Soil Thickness Soil Volume Pore Volume Pore Volume Pore Volume TPHd TPHd Mass TPHd Mass TPHd Mass TPHd <br /> (ft') (ft) (ft') (ft') (gal) (1) (mg l) (mg). (kg) (lbs) (gal) <br /> Isocon Interval?100 to 1.000 ue/l <br /> 25,846 37 956,302 334,706 2,503,773 9,477,806 0.47 4,454,569 4.45 9.82 1.40 <br /> Isocon Interval:1.000 to 5.000 ue/1 <br /> 10,819 37 400,303 140,106 1,048,066 3,967,360 2.2 8,728,192 8.73 19.24 2.75 <br /> Isocon Interval:>5.000 ua/I <br /> 859 37 31,783 11,124 83,214 314,998 8.0 2,519,983 2.52 5.56 0.79 <br /> Total TPHd in Groundwater 201334.62 4.95 <br /> Notes: Assumptions: i <br /> TPHd=total petroleum hydrocarbons as diesel porosity=35% d r <br /> ft=feet TPHd density=7.0 lbs/gal <br /> gal=gallon <br /> I=liter <br /> µg=microgram <br /> mg=milligram <br /> kg=kilogram <br /> lbs=pound <br />