REP29687 - Laserfiche WebLink

Home Browse Search

Doc Date:12/11/2001 III IIIIIIIIIIIII III Annual Hydrology Report April 28, 1988 Page 1 1.0 Hydrologic Monitoring Activities ' The hydrologic monitoring program at the tdt. Gunnison No. 1 Mine was initiated in 1974 with the crompletion of several groundwater observation wells. This preliminary monitoring netcork was expanded considerably and in 1981 with the ' approval of the Mt. Gunnison No. 1 Mine, Mining and Reclamation plan, became the "approved" hydrology monitoring program. In 1984, the hydrology monitoring program was revised with the approval of the Colorado Mined Land Reclamation ' Division (G+II.RD), to more efficiently monitor possible effects from mining and provide data for future permitting. In 1987 West E].k Coal Company (WF1Cx) applied (for revision to the hydrology monitoring program to reduce baseline monitoring in areas that con't be mined for several years and to closely key ' hydrology monitoring to areas being mined to look for possible mining impacts. Sampling parameters in the revised plan are different, utilizing indicator species to look for mining related impacts, rather than a "full list" analysis. ' This revised monitoring plan was approved by the CMLRD in the 3rd quarter of 1987. Since the approval fell in the middle o~ a quarter, WEXrC wntinued monitoring under the requirements of the then current plan until the end of the 3rd quarter, 1987 (September, 30). Therefore, all data submitted in this Annual Hydrology Report for water year 1987 (October 1, 1986 to September 30, 1987) is under the previous monitoring requirements. The 1988 water year report will reflect the monitoring plan revisions approved in 1987. ' The 1987 Annual Hydrology Report crontains the following: ' 1. Continuous flow monitoring at seven stream gaging stations plus wntinuous flow monitoring at the outlet frown Beaver Reservoir. ' 2. Continuous flow monitoring in cooperation with U.S.G.S. at the recronstructed Minnesota Creek Gaging Station site. ' 3. Quarterl water lity s lin at three surf water qua ity monitoring stations: The North Fork Gunnison River c and the North Fbrk Gunnison River ' below the mine, and the Sylvester Gulch flume site. 4. Monthly measurement of pH, temperature, dissolved oxygen, turbidity, and conductivity at the six stream gaging ' stations in the Minnesota Creek Basin and at Sylvester Gulch. ' S. Quarterly measurement of discharge and semi-annual water quality samaling on five springs issuing from or low the F-seam coal. ' 6. Quarterly measurement of flow from six springs issuing from or below the F-seam coal. ' 7. Nbnthly measurement of flow on five springs in the north half of the Dry Fork Minnesota Creek Easin.