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1 <br /> APPENDIX E <br /> Quarterly Report -First and Second Quarters 2005 <br /> CHAPIN BROTHERS INVESTMENTS, INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> Volume to Mass Calculation of Remaining Dissolved Benzene/TPH <br /> Assumptions <br /> • The distribution of dissolved benzene concentrations on the site can be approximated by a simple <br /> ' cylinder,with an average concentration of dissolved benzene (See Figure 5), <br /> • The effective porosity of soil at the site is 35% (probably overestimated), and <br /> • Data collected from the ground water sampling in October 2005 are representative of <br /> existing site conditions <br /> • The average benzene and TPH concentrations for the ellipse column is estimated to be 1,500 <br /> micrograms per liter (µg11) and 9,500 µg11, respectively These concentrations were an <br /> estimate of the remaining mass concentration between well locations at the site <br /> The area of a cylinder column can be calculated by the formula <br /> Aeylmder = nr2,where r radius of the cylinder column <br /> For the estimated cylinder column, r=70 ft and thickness c = 20 ft <br /> The area of the cylinder column is given by <br /> &=7cr'= Tc (70 ft)z= 15,394 ft' <br /> The volume of the cylinder column is given by <br /> V.=A,x height= 15,394 ft'x 20 ft =3 07,8 76 ft' <br /> Water occupies the porosity in the soil,which is estimated to be 35%of the soil volume,so the total volume <br /> of water in the saturated portion of the cylinder column is approximated by <br /> V�vmd. =(0 35)(307,876 fl)= 107,757 ft' <br /> One cubic foot of water contains 7 48 gallons,so the volume of the water in the cylinder column is given by <br /> V�=(107,757 ft3)(7 48 gal/ft')=806,022 gallons <br /> 1 <br /> One gallon of water equals 3 785 liter of water,so the volume of the water expressed as liters in the cylinder <br /> Iis given by <br /> V.=(806,022 gallons)(3 785 liter/gallon)=3,050,795 liters of water <br /> 1 <br />� 1 <br />