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2003 AHR McClane & Munger Canyon Mines Page 4 <br />MONGER CANYON MINE <br />The Munger Mine has been sealed and it is not expected to be reopened. There was <br />no water encountered in mine; therefore, there has been no effect on the hydrologic <br />regime of the area. The current mine workings are shown on Figure 4. <br />PRECIPITATION <br />Based upon Bureau of Land Management records from a rain gage in Ashford Canyon, <br />the 2003 water year experienced 13.76 inches of precipitation compared to average <br />precipitation of 17.87 inches. The rain gage is not located at the mine but about 3.5 <br />miles north at an elevation of 5895 feet compared with 5610 at the portals. The daily <br />rainfall record is detailed on Table 2. The greatest 24 hour precipitation event during <br />the year, 1.9 inches, occurred on October 24"'. Figure 2 presents a graphical <br />comparison of the 2003 total monthly precipitation and the average monthly <br />precipitation for the period 1977 through 2003. <br />Precipitation data are obtained from Jim Scheidt, BLM, iim scheidtQco.blm.oov. <br />EFFECT OF THE MINES ON THE EAST SALT CREEK REGIME <br />Surface Water <br />Due to the limited disturbance of the mines there is little chance any significant effect on <br />the quantity or quality of the surface waters near either mine sites has occurred. As the <br />Division notes in its approval package for the Munger Canyon Mine, the total area that <br />will be disturbed by both mine sites amounts to 0.12 percent of the area of the East Salt <br />Creek drainage basin above the mines. <br />Surface water samples from East Salt Creek were obtained for two quarters during the <br />2003 water year. East Salt Creek was dry during the 15` and 4"' quarter 2003 monitoring <br />events. Results from all water samples collected in 2003 are presented in Table 4. <br />The results from the samples collected from East Salt Creek above and below the mine <br />site are generally the same for all parameters. <br />Table 6 contains two analysis of mine water discharged into East Salt Creek. The mine <br />water had an average TDS value of 1514 mgil. The average TDS value for East Salt <br />Creek at SW-1 was 2,195 mg/I during 2003. Therefore, mine water discharge <br />continues to supplement and improve the water quality in East Salt Creek. <br />The sample sites on McClane Creek were dry all four quarters. <br />Groundwater <br />Table 5 shows the results of groundwater sampling during 2003. The average static <br />water level for the baseline years of 1981 and 1986 is also shown. Results of quality <br />sampling are consistent with the results from previous years. Water depths were lower <br />