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L (Post mining at 011 Tributary alluvium) • <br />= 0.000019(cfs) x 1296(mg/l) x 0.0027 = 0.000066 t/d <br />(NOTE: Combined discharges (cfs) from 011 Tributary alluvium (0.000016 cfs) <br />and Spoil (0.000003) for calculating postmining chemical load in the 011 <br />Tributary alluvium). <br />Upper Grassy Dreek alluvium and Spoil (used 011 Tributary Pos[mining chemical load for <br />spoil) <br />DSc 0.000066(t/d) + 0.00437(t/dI = 3548 mg/l <br />(0.000038(af/d) + 0.00088(af/d)) x O.D0136 (OX increase) <br />(NOTE: No additional impacts to Grassy Creek alluvium from spoil discharges anticipated <br />below YGAL15 ). <br />Loadinv Calculations - Annand Draw alluvium <br />Annand Draw alluvium and Spoil <br />DSC = 0.000146(t/d) + 0.000139(t/d) = 2036 mg/l • <br />(0.000024(ef/d) + 0.000079(af/d)) x 0.00136 (58X increase) <br />L (postmining at Annand Draw alluvium) <br />= 0.000052(cfs) x 2036(mg/l) x 0.0027 = 0.000286 t/d <br />(NOTE: Combined discharges(cfs) from Annand Drew alluvium (0.00004 cfs) and Spoil <br />(0.000012 cfs) for calculating postmining chemical load in the Annand Draw <br />alluvium.) <br />Loner Grassy Creek alluvium and Spoil (used Annand Draw postmining Chemical load for <br />Spoil <br />DSc = 0.000286ft/d) + 0.00199(t/d) = 1350 mg/l <br />(0.0001(af/d) + 0.00114(af /d)) x 0.00136 (4.8X increase) <br />Loading Calculations - Sage Creek alluvium <br />Y-1 Tributary alluvium and Spoil <br />DSC = 0.000085(1:/d) + 0.000056(t/d) = 1571 mg/l • <br />(0.000014(af/d) + 0.000052(af/d)) x O.D0136 (99X increase) <br />17-5 -b Revised 06/19/95 <br />