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Tier 1 Spreadsheet <br /> Table H-6. Green-Ampt Equations Used to Calculate Attenuation Coefficients in <br /> the Vadose Zone (for SSTLs) <br /> The Green-Ampt equation predicts pore water travel time from a vadose zone soil <br /> source to the water table This travel time is then used to account for degradation in <br /> the vadose zone <br /> Time,t, for infiltrating water to move from the source to the water table(days) <br /> 6Q <br /> L– (t–H t+L–Hf 1 dory <br /> t=— )11 <br /> K. f)lni–H f 86400 sec <br /> Vertical seepage velocity, Vr,of the water(cm/day) <br /> YJ – L <br /> t <br /> Individual chemical velocity(considers retardation), V,,(cm/day) <br /> KV. <br /> 1+ Pb *Kd <br /> er <br /> The partition coefficient for organic chemicals,(ml/g)is calculated as <br /> Kd = K. F,�, <br /> Travel time for the chemical to reach the water table, t„,(days) <br /> L <br /> tc = Y <br /> Green-Ampt attenuation coefficient, AFGrA,„, is then calculate using the first-order <br /> degradation equation <br /> AF – C = e(-a`1 <br /> GrAm <br /> C” <br /> RBST.in soil considering degradation in the vadose zone,RBSL(Green-Ampt) [mg/kg] <br /> RBSLs <br /> RBSL(Gnrn-Am <br /> °') AFGrA. <br /> H-23 <br /> r <br />