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1 ' 12. Monthly measurement of precipitation at the Horse Creek storage gage. ' 1.1 Surface Water Nbnitoring Data from the continuous recording stream gages located on Horse Creek, South Prong, Lick Creek, Upper Dry Fork, Lower Dry Fork, Sylvester Gulch, Minnesota Creek above Dry Fork, and Fast Fock outflaa from Beaver Reservoir have been reduced and are provided in the Quarterly Reports. Quarterly Reports include daily flag estimates with maximum, minimum and mean flows reported for each month. Locations of these stations are shown on Exhibit I. ' Gaging records during water year 1986 are generally good. Stilling wells began freezing in mid to late December and thawed out in late February with one or two thawing out in early March. Debris buildup was minimal in 1986 and only the ' U.S.F.S. Minnesota Creek flume was affected. Loss of data occurred at the U.S.F.S. flume from April until July due to debris buildup as well as high flows going through the Overflow diversions. Loss of data at the Upper Dry Fork flume occurred from May 25 to June 8, August 1 to August 6, August 12 to September 9, ' and from September 13, to September 30. This data loss was due entirely to Beaver activity in the area, which caused a backup of water and submergence of the flume. All other stations had good data for the remainder of the year and only minor problems which did not significantly affect data. A copy of the U.S.F.S. gaging record average daily flow for Minnesota Creek is contained in Appendix B. ^ A copy of the U.S.G.S, gaging record average daily flow for the North Fork of the Gunnison above Somerset, CD (about 1/4 mile upstream of the mine site) is ' contained in Appendix A. Monthly measurement of field water quality was conducted at the gaging stations ' located on Horse Creek, South Prong, Lick Creek, Upper Dry Fork, Dower Dry Fock, Sylvester Gulch and Minnesota Creek above Dry Fork. ' Quarterly water quality sales are obtained foc laboratory analysis form three locations: the North Fork above Sylvester Gulch, the North Fork belay the Mine and Sylvester Gulch. Sampling locations are shown on Exhibit I. Water quality data previously collected by the U.S.G.S. at their North Fork gaging station ' near Somerset was discontinued in September, 1982. 1.2 Spring Water Monitoring ' Springs included in the hydrology monitoring program for water year 1986 are shown in Table 1.2-1 along with monitoring and sampling frequency. Monitored springs locations are shown on F~chibit I. All known springs in the leases area ' are shown on Exhibit 2.8.1.B. (1"'=2000') which is contained in Volume 3 of the M and R Plan. In accordance with U,S. Forest Service stipulations a map of U.S. Forest Service water resources has been included as Exhibit III. Sore of the ' U.S.F.S, water resources are springs. Spring monitoring data including flaw, water quality analysis, and other ' pertinent information is contained in the Quarterly Hydrology Monitoring Reports. (2)