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Page Two <br /> September 23, 1994 (Updated 1111994) <br /> Ir <br /> Whe e the variables <br /> Log Koc = (a Log Kow ) + b <br /> foc = 0 03% = (from lab data) = organic carbon fraction <br />' a = 0 989, and b = -0 346 [coefficients from Kinchoff(1981)] <br /> Log Kow for benzene = 2 13 = octanol water coefficient [from Handbook (1983)] <br /> Consequently, a benzene retardation factor (Rf) and partition coefficient (K,) are calculated as follows <br />' Log Koc = (0 989 (2 13) + -0 341) <br /> Log Koc = 176 <br /> KO, = 5754 <br /> Kp 57 54 x 0 0003 = 0 0173 <br /> PB = 162 <br /> Rf = 10 + ( 162 x 0 0173) = 107 <br /> 040 <br /> Rf = 107 <br /> Benzene Transport <br /> These calculated values are mserted into the velocity equation to estimate the lateral mobility of <br />' benzene per day <br />' "Pore" Velocity VI (ft/&Y) — k��x dh/dl = 3 ft/day (0 006E = 0 045 ft/day <br /> (maximum) 0 040 <br /> Benzene travel distance per day L(ft) = V, x At = rate x time <br /> Rf retardation factor <br />' And given a hypothetical duration of benzene travel from the site <br />' At = 1 year — 365 days <br /> L(ft) — 0 045 ft/da 365 days) — 15 35 feet lateral distance <br /> 107 <br /> This Model functions independent of a benzene concentration and does not consider that active <br /> 1 bioremediation may be occurring in the vadose zone and shallow groundwater <br />' PROTECT94026PH4 MEM SECOR / CONCORD <br />