Laserfiche WebLink
• impacts that might be expected to occur during Water Year 1983. <br />The third section provides a brief analysis of baseline data for <br />the Minnesota Creek basin. Recommendations for Water Year 1983 <br />monitoring are also provided. <br />Report Conclusions <br />An extensive baseline monitoring data base has been developed for <br />the Mt. Gunnison No. 1 Mine. Operational monitoring started in <br />August, 1981 with commencement of construction activities at <br />Mt. Gunnison. <br />Operational monitoring data for the period August, 1981 to <br />September 30, 1982 show no significant adverse impacts on the <br />• hydrologic balance associated with mining and construction <br />activities at the Mt. Gunnison No. 1 Mine. <br />A uniform cone of depression has not developed during mining and <br />portal construction. The geology of the site is complex and a <br />uniform aquifer is not found. Instead we find a number of low <br />permeability units in the colluvium and the Barren Member. Most <br />of these units are not saturated. <br />Groundwater conditions around the Mt. Gunnison No. 1 Mine are <br />extremely complex. The colluvium appears to recharge and <br />"discharge on a seasonal basis in response to snowmelt. The <br />sandstone channels within the Barren Member above the F-Seam are <br />. often dry. Near the outcrop small quantities of water are found <br />~ along the base of the F-Seam coal above the clay floor. <br />-4- <br />