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• This flow depth was used in calculating the 009 spoil flow discharging to the Sage Creek alluvium. An alluvial saturated thickness in Sage Creek of 15 feet was determined at Alluvial Well CW-52W-21A, which was installed immediately downstream of the confluence of 009 tributary and Sage Creek. The hydraulic gradient for the 009 tributary alluvium was assumed the same as the surface topography. The hydraulic gradient for the Sage Creek alluvial aquifer was based on water levels measured at USCS Alluvial Well Al-A13 in upper Sage Creek. An alluvial hydraulic conductivity value of 0.02 was assumed for both 009 tributary and Sage Creek. The following equations present the premi ning and postmini ng chemical load and TDS concentration changes as a result of the spoil aquifer discharging into the downg radient alluvial aquifers, which in turn discharge into other confluent downgradient alluvial aquifers. Dry Creek Alluvial System Premi ning: 006 Trib. L = 0.000013 x 2317 x 0.0027 = 0.000081 tons/day Hubberson Culch • Watering Trough Gulch Dry Creek Alluvium 005 Trib. L = 0.000052 x 1024 x 0.0027 = 0.00014 tons/day L = 0.000073 x 526 x 0.0027 = 0.00010 tons/day L = 0.000125 x 726 x 0.0027 = 0.000245 tons/day L = 0.000015 x 2317 x 0.0027 = 0.0000938 tons/day Dry Creek Alluvial System Postmining: 006 Trib. DSC = 0.0000405 + 0.000079 = 3394 mg/1 (46@ TDS increase) 0.000026 x 0.00136 006 Trib. L = 0.000013 x 3394 x 0.0027 - 0.00012 tons/day (489a tonnage increase) Hubberson Culch DSC = 0.00012 + 0.000062 = 1299 mg/1 (27L TDS (0.000026 + 0.000077) x 0.00136 increase) Hubberson Gulch L = 0.000052 x 1299 x 0.0027 = 0.000182 tons/day (30Po tonnage increase) Dry Creek Alluvium DSC = 0.000182 + 0.00010 = B5 3 mg/1 (17~ TDS (0.000103 + 0.00014) x 0.00136 increase due to 006 spoil discharge) Dry Creek Alluvium L = 0,000125 x 853 x 0.0027 = 0.000288 tons/day (18Po tonnage increase due to 006 • spoil discharge) 45