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1 <br />Doc Date:12H 112001 <br />' Annual Hydrology Report <br />April 28, 1988 <br />Page 1 <br />1 1.0 Hydrologic Nbnitoring Activities <br />ss <br />The hydrologic monitoring program at the Ait. Gunnison No. 1 Mine was initiated <br />in 1974 with the completion of several groundwater observation wells. This <br />preliminary monitoring network was expanded considerably and in 1981 with the <br />' approval of the Mt. Gunnison No. 1 t4ine, Mining and Reclamation plan, became the <br />"approved" hydrology monitoring program. In 1984, the hydrology monitoring <br />program was revised with the approval of the Colorado Mined Land Reclamation <br />Division (CMLRD), to more efficiently monitor possible effects from mining and <br />' provide data for future permitting. In 1987 West Elk Coal Company (WECC) <br />applied 'for revision to the hydrology monitoring program to reduce baseline <br />monitoring in areas that wvn't be mined for several years and to closely key <br />hydrology monitoring to areas being mined to look for possible mining impacts. <br />Sampling parameters in the revised plan are different, utilizing indicator <br />species to look for mining related impacts, rather than a "full list" analysis. <br />This revised monitoring plan was approved by the CMI,RD in the 3rd quarter of <br />1987. Since the approval fell in the middle of~ a quarter, WDGC continued <br />monitoring under the requirements of the then current plan until the end of the <br />3rd quarter, 1987 (September, 30). Therefore, all data submitted in this Annual <br />Hydrology Report for water year 1987 (October 1, 1966 to September 30, 1987) is <br />under the previous monitocing requirements. The 1988 water year report will <br />reflect the monitoring plan revisions approved in 1987. <br />l The 1987 Annual Hydrology Report contains the following: <br />1. Continuous flow monitoring at seven stream gaging stations <br />plus continuous flow monitoring at the outlet from Beaver <br />Reservoir. <br /> 2. Continuous flora monitoring in cooperation with U.S.G.S. at <br /> the reconstructed Minnesota Creek Gaging Station site. <br /> 3. Quarterl water lity s lin at three surf water <br /> qua ity monitoring sta ions: The North Fork Gunnison River <br /> c and the North Fork Gunnison River <br /> below the mine, and the Sylvester Gulch flume site. <br /> <br /> 4. Monthly measurement of pH, temperature, dissolved oxygen, <br /> turbidity, and conductivity at the six stream gaging <br /> stations in the Minnesota Creek Basin and at Sylvester <br />t Gulch. <br /> 5. Quarterly measurement of discharge and semi-annual water <br />1 quality samaling on five springs issuing from or low the <br /> F-seam coal. <br /> 6. Quarterly measurement of flow from six springs issuing from <br />1 or below the F-seam coal. <br />1 7. Monthly measurement of flow on five springs in the north <br />f th <br />D <br />h <br />lf <br />k Mi <br />t <br />k B <br />i <br /> ry For <br />a <br />o <br />e <br />nneso <br />a Cree <br />as <br />n. <br /> <br />Monthly water level and sa-rtpling records for water year 1987 were near complete <br />for most locations. Figure 1.3-1 lists wells with an inoom~olete record and the <br />reason for the incomplete record. Rewrds for all other locations are complete. <br />