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Annual Hydrology Report April 28, 1988 Page 3 1 station (approximately 1/4 mile upstream of the mine site) is contained in Appendix .1. Monthly measurement of field water quality was conducted at the gaging stations located on Horse Creek, South Prong, Lick Creek, Upper Dry Fork, Lower Dry Fork, Sylvester Gulch and Minnesota Creek above Dry Fork. Quarterly water quality samples are obtained for laboratory analysis from three locations: the North Ebrk above Sylvester Gulch, the North Ebrk below the Mineand 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 1987 are shown in Table 1.2-1 along with monitoring and sampling frequency. Monitored springs locations are shown on Fychibit I. A11 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 b[hibit III. Some of the U.S.F.S. water resources aze springs. No changes in the U.S.F.S. Water Resources Map is necessary for 1988 as no new rights were filed for or new uses made in 1988 in the lease area. Spring monitoring data including flow, water quality analysis, and other pertinent information is contained in the Quarterly Hydrology Monitoring Reports. Bar graphs depicting spring flows from 1979 to present have been included for the 1987 Annual Hydrology Report and are contained in Appendix D. Springs were monitored when accessible and the records for the most part are good. In early spring of 1986 G-25, G-26a, and G-31 were made inaccessible by landslides in Lone Pine Gulch and on the road to the springs. 1.3 Ground Water Monitorin _.. During Water Year 1987 water levels were monitored monthly at 31 wells when weather permitted. The location of these wells are shown on Exhibit I. Wells included in the hydrology monitoring program for water year 1987 are shown in Table 1.2-2 along with monitoring frequency, type, and sampling. Groundwater well monitoring data such as water level (if present), quality, dates, and other pertinent information is contained in the Quarterly Hydrology Nbnitoring Reports. Well hydrographs for the 1987 water monitoring quarters are also contained in the quarterly hydrology reports. These hydrographs are cumulative for the year. Monthly water level and sampling records for water year 1987 were near oort~plete for most locations. Figure 1.3-1 lists wells with an inoort4olete record and the reason for the incomplete record. Records for all other locations are complete.