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' APPENDIX G Mass-Volume Calculation of Dissolved MTBE Former MEL BOKIDES PETROLEUM Facility ' 2191 Navy Drive, Stockton, California Assumptions • The distribution of dissolved hydrocarbon concentrations on the site can be approximated by FOUR co-centric ellipse columns, with the inner column containing the higher MTBE concentrations (See Figure 8), • The effective porosity of soil at the site is 35% (probably overestimated), and • Data collected from the June 2005 ground water sampling event are representative of existing site conditions The area of an ellipse can be calculated by the formula A= �ab ! r%L ' A�=n'/zab, where a is the long radius of the ellipse and b is the short radius The dissolved plume has been divided into four area based on the dissolved MTBE concentrations ' Area 1 - outermost area with an average concentration of 10 micrograms per liter For the estimated outer ellipse Area 1, a=240 feet, b= 170 feet and thickness c = 20 feet Area 2 - area with an average concentration of 5 0 micrograms per liter For the estimated ellipse Area 2, a=220 feet,b= 150 feet and thickness c = 20 feet • Area 3 - area with an average concentration of 10 micrograms per liter ' For the estimated ellipse Area 3, a= 140 feet, b= 135 feet and thickness c = 20 feet • Area 4-inner most area with an average concentration of 100 micrograms per liter For the estimated inner ellipsoid, a�40 feet, b=50 feet, and c z 20 feet ' The area of the ellipse columns are given by ' Ael =nab=Tu 1/2 (240 ft)(170 ft)= 64,088 fF - 51,836 ft' (Ae2)= 12,252 5 ftp Ae2 =riab=Tc 1/2 (220 ft)(150 ft)= 51,836 ft' - 29,688 ft2 (Ae3)= 22,148 ft2 Ae3 =nab=Tu 1/2 (140 ft)(135 ft)= 29,688 ft - 3,455 78 ft2 (Ae4)=26,232 ft, ' Ae4 =nab =rr '/x (40 ft)(55 ft) =3,455 78 ft2, L = (o 910 Ff- The volumes of the ellipse columns are given by ' Ve l = 12,252 5 W x 20 feet=245,040 ft' )k 3 " ;�, CRS 's Vet=22,148 ft2 20 feet=442,960 ft' 7 Ve3 =26,232 ft2 x 20 feet= 524,640 ft' Ve4=3,455 78 W x 20 feet=69,115 ft' --� .� W�`� Advanced GcoEnvlroomentzl,Inc I