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• L (POStminin9 at Y-1 Tributary Alluvium) = 0.000033(cfs) x 1571(mg/I) x 0.0027 <br />= 0.00014 t/d <br />(NOTE: Combined discharges (cf s) from Y-1 Tributary alluvium (0.00(1026 cf s) and spoil <br />(0.000007cfs) for postmining <br />chemical load in the Y-1 Tributary alluvium). <br />Sage Creek alluvium end Spoil (used Y-1 Tributary Postmining chemical load for spoil). <br />OSC = 0.00014 t/d + 0.078488 t/d = 798 mg/l <br />(0.000065(af/d) + 0.07234(af/d)) x 0.00136 (0.1X increase) <br />Replaced Spoil Discharge and Streamflow <br />General Assumptions <br />1. Discharge values for downgradien[ streams calculated using the mean of instantaneous <br />discharge measurements collected during the June through September growing season. <br />Discharge data for lower Cressy Creek Site SY-S2-2 was obtained from [he Seneca II <br />• PAP and Seneca II AHRS (1992, 1993). Discharge values used to calculate resultant <br />chemical loads (denominators in the DSC equations) were converted to acre-feet per <br />day by multiplying cfs by 1,98347. <br />2. Discharge values for resaturat ed spoil are presented in Table 17-15, and are <br />explained in preceding text (Tab 17). <br />3. TDS values collected during the June through September growing season at downgradient <br />stream sites were averaged. TDS data for lower Grassy Creek Site SW-52-2 was <br />obtained from the Seneca II PAP end Seneca II AHRS (1992, 1993). <br /> <br />17-5-7 Revisetl 06/19/95 <br />