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' First and Second Quarters 2005 <br /> CHAPIN BROTHERS INVESTMENTS, INC. <br /> i ' 1766 Monte Diablo Avenue, Stockton, California <br /> Volume to Mass Calculation of Dissolved Benzene/TPH <br /> ' Assumptions <br /> • The distribution of dissolved benzene concentrations on the site can be approximated by a simply <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 May 2005 are representative of existing site <br /> conditions <br /> ' • The average benzene/TPH Concentration for the ellipse column is estimated to be 500 micrograms <br /> per liter (µg/1) AND 5,000 µg11 These concentrations were an estimate of the remaining mass <br /> concentration between well locations at the site <br /> The area of an cylinder column can be calculated by the formula <br /> Aeylmder — nr ,, where r radius of the cylinder column <br /> ' For the estimated cylinder column,r= 50 ft and thickness c 20 ft <br /> The area of the cylinder column is given by <br /> IAe= =2 = n (50ft)2= 7,854ft' <br /> The volume of the cylinder column is given by <br /> 1V =A,x height= 7,854 ft2 x 20 ft = 157,079 6 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�,,o,ds =(0 35)(157,079 6 ft')= 54,977 8 W <br /> One cubic foot of water contains 7 48 gallons,so the volume of the water in the cylinder column is given by <br /> Ve= (54,977 8 ft3)(7 48 gal/ft')=411,234 gallons <br /> One gallon of water equals 3 785 liter of water,so the volume of the water expressed as liters in the cylinder <br /> is given by <br /> ' Ve(411,234 gallons)(3 785 liter/gallon)= 1,556,522 5 liter of water <br /> • <br /> Advanced GeoEnroroamcntal,Inc <br />