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COMPUTATION SHEET <br /> ROJECT TITLE Safeway Stockton - 1111 Navy Drive PROJECT NO 22794-100 001 <br /> DESCRIPTION Mass of Petroleum Hydrocarbons in Soil & Groundwater SHEET 4 OF 4 <br /> PREP BY DATE CHKD BY DATE <br /> Mass in Groundwater- 1995 data <br /> Planimeter Data _ <br /> porosity pounds <br /> ��� 1 <br /> Depth Interval Contour Line Area (ft2) Volume(ft3) Corr Vol (ft3) torr bL`k ( <br /> 1 ppm 155931 3118620 , 3, 1185076 3948717 <br /> 5 ppm 454268 9085360 5966740 226736141483339 <br /> Assumptions concentrations within isoconcentration line 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 Ib 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 beanng zone <br /> lbs TPHD= wt gallons avg TPHD cone <br /> water <br /> 1 ppm contour line <br /> lbs TPHD = 73948717 0 0000011 <br /> lbs TPHD = 8134 lbs within the 1 ppm contour line <br /> 0 5 ppm contour line <br /> lbs TPHD = 1 41E+08 7 55E-07 <br /> lbs TPHD= 10682 lbs within the 0 5 ppm contour line <br /> 0 1 ppm contour line <br /> lbs TPHD= 92210751 3 25E-07 <br /> f lbs TPHD= Ibs within the 1 ppm contour line <br /> 188 2 lbs TPHD in water bearing zone <br /> 26 5 gal TPHD in water bearing zone <br /> H,/exceldat/arco/2076calc xls <br />