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III IIIIIIIIIIIII III 999 STATE OF COLORADO Roy Romer, Govei DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION DAVID C. SNELTON, Director DATE: August 14, 1987 T0: Tam Gillis FROM: Steve Renner RE: Munger and McClane Canyon Mines Annual F~ydrologic Report (Files C-80-004, C-81-021) Per your request, I have reviewed the Salt Creek Mining Compagy Annual Iydrologic Report (AHR) for the Munger and McClane Canyon Mines.-~Th1s annual report was submitted to satisfy conditions of the approved permit. The McClane and Munger Mines remained essentially inactive during the reporting period. Therefore, little change to previously reported conditions has occurred. While the Munger Canyon Mine remains dry, the McClane-Canyon Mine realizes inflows of approximately 1.2 gallons per minute. Although there is same question as to the inflow mechanics, the consequences of dewatering into the mine remain negligible. The statement of probable hydrologic consequences regarding ground water impacts remains va11d for both operations. Due to site inactivity, the surface water monitoring program is restricted to quarterly monitoring of McClane Creek and Munger Creek. Water quallly analysis results demonstrate that each creek exhibits variable concentrations of each sampled parameter as flow conditions change. No clearly discernable pattern of parameter concentration is evident. Based upon the McClane Creek water qua111iy sample of January, 1987, it does not appear that the McClane Car(yon Mine discharge is significantly impacting McClane Creek. It appears, therefore, that the statement of probable iydrologic consequences regarding impacts to Salt Creek remains valid for both operations. Although the report is very well done, it is suggested that future annual hydrologic reports be structured around a water year (October 1 through September 30) reporting period. Changing the actual period of time in which data is examined will not imps^t the frequency or timing of data collection, nor will it affect the submit date for the report. Changing to the water year forniat'wiil allow both the Division and f3ie operator to analyze data within a logical period of time :base flow to baseflow. If the operator wishes to discuss the mechanics of changing to this reporting period, please have them contact me. cc: Mike Savage /bdc 1777E 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel (3031 888:3587