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COMPUTATION SHEET <br /> *OJECT TITLE Safeway Stockton - 1111 Navy Drive PROJECT NO 22794-100 001 <br /> DESCRIPTION Mass of Petroleum Hydrocarbons in Soil & Groundwater SHEET 3 OF 4 <br /> PREP BY DATE CHKD BY DATE <br /> Mass in Groundwater-1991 data <br /> Planimeter Data <br /> porosity pounds <br /> Contour Line Area (ft2) Volume (ft3) Corr Vol (ft3) torr(ft3) water <br /> TPHD 100 ppm 925 18500 18500 7030 438672 <br /> 10 ppm 2275 45500 27000 10260 640224 <br /> 1 ppm 4200 84000 38500 14630 912912 <br /> 5 ppm 7710 154200 70200 26676 1664582 <br /> Assumptions concentrations within isoconcentration lin_ �e are assumed constant <br /> the concentration does not vary with depth <br /> average of detected concentrations are used in the calculations <br /> the porosity correction assumes an average porosity of 0 38 and the pores are completely filled <br /> with groundwater <br /> wt of water 62 4 lb 1 ft3 and diesel = 7 1 Ib/gal <br /> the thickness of the saturated zone is approximately 20 feet <br /> Mass of TPHD in the first encountered water bearing zone <br /> lbs TPHD= Vol wt gallons avg TPHD cont <br /> (ft3) water <br /> 100 ppm contour line <br /> lbs TPHD= 438672 0000155 <br /> lbs TPHD= 6799 lbs within the 100 ppm contour line <br /> 10 ppm contour line <br /> lbs TPHD = 640224 000005 <br /> lbs TPHD = 3201 lbs within the 10 ppm contour line <br /> 1 ppm contour line <br /> lbs TPHD= 912912 0 0000069 <br /> lbs TPHD= 630 lbs within the 1 ppm contour line <br /> 0 5 ppm contour line <br /> lbs TPHD = 1664582 0000005 <br /> lbs TPHD= 832 lbs within the 0 5 ppm contour line <br /> 108 3 lbs TPHD in water bearing zone <br /> 15 25 gal TPHD in water bearing zone <br /> H,/exceldattarco12076calc As <br />