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III ~II~II~II~~II~II sss DEPARTMENT OF NATURAL RESOURCES David H. Getches. Executive Director MINED LAND RECLAMATION DIVISION DAVID C. SHELTO N, Director Richartl D. Lamm Governor Date December 3, 1985 To: Tom Gillis From: Steve Renner Re: SALT CREEK AHR (OUR FILES C-004-80 and C-020-81) I'Yl e~lea,ru. C-, ~J I have briefly reviewed the Salt Creek annual hydrologic report. This report summarizes; the amount of water exported from McClane Canyon Mine to Munger Canyon Mine; the amount of water used at each mine; the amount of water discharged from McClane Canyon Mine to East Salt Creek; and limited quality analysis for the water discharged from McClane to East Salt Creek. McClane Canyon Mine The McClane Canyon Mine induces flow from the Mesaverde Group, the mined unit. Water is stored within the mine, and periodically discharged. When it is pumped, some water is allowed to flow to East Salt Creek, and some is exported to the Munger Canyon Mine. A total of 854,942 gallons of water was pumped from the McClane Mine during the reporting period (April, 1984 thru March, 1985). Water consumption at McClane was 6,000 gallons (0.07% of the total pumpage), while 95.6% or 818,942 gallons were discharged into East Salt Creek. The total inflow to the creek is approximately 1.56 gallons/minute (assuming constant discharge). The water discharged to the creek is high in total dissolved solids (1,668 mg/1; table 1). Baseline TDS values of East Salt Creek average 3,340 mg/1. The addition of this relatively high TDS water should not affect the quality of East Salt Creek, however, this can not be substantiated without discharge measurements from the creek. Table 1. indicates that total suspended solids (TSS) values fluctuate over time. This is probably due to conditions within the mine. The maximum TSS value permitted is 70 mg/1 (35 mg/1 average), therefore the mine meets effluent standards. Table 1. -- IJater Quality Comparison from McClane Canyon Mine Discharge, 1983, 1984, and 1985 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567