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• Basic Equakions used to calculate chemical loads and resultant TDS concentration. <br />Chemical Load <br />L= oxcxo.ooz7 <br />Where: <br />L = Chemical load (tons/day) <br />0 = Flow (cfs) <br />C TDS concentration <mg/II <br />0.0027 = Conversion factor to convert the product of floe in cfs antl TDS in mg/l to <br />chemical load in tons/day. <br />Resultant TDS <br />DSL = DSL <br />axf <br />Where: <br />DSC = Resultant TDS Concentration (mg/l) <br />DSL = Sum of the chemical load for the contaminant source and the receiving source (see <br />above - tons/day). <br />D = Sum of the contaminant and receiving source floe rates (acre - feet/day) <br />f = 0,00136 Conversion factor to convert the product of acre-feet and milligrams per <br />• Liter into tons. <br />Replaced Spoil Discharge and Downgradient Bedrock Units <br />General Assumptions <br />1. Discharge in cfs wy35 derived from the equation: 0 = (1.16E-5)KIA, where the constant <br />1.16E-5 converts ft /day to cfs. Discharge values used to calculate resultant chemical <br />loa tls (denominators in the DSC equations) were converted to acre-feet per day by multiplying <br />cfs by 1.98347. <br />2. Hydraulic conductivities (K) were based on site specific aquifer tests performed at <br />wells completed in each unit (Appendix 7-3, Tab 7). <br />3. Lross sectional areas (A) were calculated as the product of saturated formational <br />thickness and maximum crop length at downgradient portions of pits with the greatest <br />likelihood of spoil resaturation. <br />4. Hydraulic gradients for Wadge overburden and coal were measured from potentiomet ric <br />surface maps (Exhibits 7-2 and 7-3, Tab 7). Nydraul is gradients for Wolf Creek <br />overburden and coal estimated based on water level data and exploration core drilling <br />information. <br />5. TDS values collected at bedrock monitoring wells representative of each permit area <br />were averaged and used (Appendix 7-4). Resaturated spoil TDS value assumed to reach <br />4500 mg/L. <br />6. Spoil flow into the overburden and Wa dge coal is governed by [he same hydraulic <br />characteristics determined for each bedrock unit. <br />• <br />[7-5-1 Revised 06/19/95 <br />