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L (POS tfiining at Upper Grassy Creek) 0.2150(cf s) x 1337(mg/l) x 0.0027 = 0.7761 t/d <br />(NOTE: Combined discharges (cfs) from Upper Grassy Creek (0.1850cfs) and spoil <br />0.030 cfs) for calculating postmining chemical load in Upper Grassy Creek). <br />Lower Grassy Creek and Spoil (used Upper Grassy Creek postmining Chemical load for spoil) <br />DSC = 0.7761(t/d) + 0.44652(t/d) = 1626 mg/l <br />(0.4264(af/d) + 0.1269(ef/d)) x 0.00136 (OX increase) <br />L (POStmining at Lower Crassy Creek) 0.279(cfs) x 1626(mg/l) x 0.0027 = 1.225 t/d <br />(NOTE: Combined discharges (cfs) from Postmini ng Upper Grassy Creek (0.2150cfs) and gain <br />in flow at Lower Grassy Creek (.0640 cfs) for calculating postmining chemical load <br />in Lower Grassy Creek used to evaluate downstream impacts along Annand Drew). <br />Loadinc Calculations - Annand Draw <br />Annand Draw end Spoil <br />DSC = 0.88680([/d) + 0.03540([/d) = 3938 mg/L <br />• (0.1448(af/d) + 0.0274(af /d)) x 0.00136 (314X increase) <br />L (POStmining at Annand Draw) = 0.086788(cfs) x 3938(mg/l) x 0.0027 = 0.92278 t/d <br />(NOTE: Combined discharges from Annand Draw (0.0138cfs) and Spoil (0.072988cfs) for <br />postmining chemical load in Annand Draw.) <br />Lower Grassy Creek and Spoil (used Annand Drew Postmining chemical load for spoil) <br />DSC = 0.92278(t/d) + 1-225(t/d) = 2177 mg/l <br />(0.17214(af/d) 0.5534(ef/d)) x 0.00136 (OX increase) <br />Loadinc Calculations - Saoe Creek <br />y•1 Tributary and Spoil <br />DSC = 1.93185([/d) + 0.02309(t/d) = 4291 mg/l <br />(0.31537(af/d) + D.01964(af/d)) x 0.00136 (397X increase) <br /> <br />17-5-9 Revised 06/19/95 <br />