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• Sanborn Creek Mine 1995 Annual Hydrologic Report <br /> the time of the August monitoring, with re-emergence of Spring 10 <br /> by October and Spring 11 by December of 1994. <br />During 1995, Springs 8, 10, and 11 continued to deposit material <br />onto the road surface of the old highway. The Colorado Department <br />of Transportation continues to remove material from the roadway and <br />ditches in these areas, leading to considerable variability in the <br />monitoring measurements. Roadway maintenance impacts to Springs 8, <br />10, and 11 by the Colorado Department of Transportation are beyond <br />the control of Oxbow Carbon & Minerals, Inc. <br />Precipitation or snowmelt water infiltrates and percolates downward <br />until the water encounters a coarse zone or aquiclude which causes <br />the water to surface as a spring. The primary use of the springs <br />is by wildlife. The only spring to consistently contribute to <br />surface flow into the North Fork of the Gunnison is Spring 8. All <br />other spring surface flow, if any, returns to the ground before <br />reaching the North Fork of the Gunnison. <br />Surface water monitoring stations AG-1 "A" Gulch, BG-1 "B" Gulch, <br />CG-1 "C" Gulch, HN-1 Hawksnest Creek, HG-1 Hoopla Gulch, and BC-1 <br />Sardine Canyon, are designed to monitor flow characteristics in the <br />respective creeks and gulches. These surface water monitoring <br />points are designed to verify that the underground mine does not <br />have an adverse effect on the quality or quantity of run-off from <br />• these ephemeral drainages that seldom have flow. Monitoring <br />results collected during 1992 and 1993 will be the baseline <br />information with which future monitoring results will be compared. <br />These stations were monitored monthly. No flow was recorded for <br />the stations except for HN-1 Hawksnest Creek, which had flow in <br />March, April, May, June, and July. The monthly field parameters <br />were measured each month there was flow in Hawksnest Creek, and the <br />quarterly full suite of surface water parameters was analyzed in <br />March and June. <br />Groundwater Information <br />The data collected from the groundwater monitoring stations and <br />laboratory results are presented in Appendix 4. <br />The sealing of all of the abandoned Somerset Mine portals precludes <br />obtaining underground water samples. Wells B-6 and H-10 are used <br />to monitor groundwater inflow and quality in order to predict the <br />extent of flooding in the underground workings since the mine was <br />closed in 1985. <br />H-10, a well in Hubbard Creek Canyon, was monitored in April and <br />October for field parameters. The full suite of groundwater <br />8 <br />• <br />