REV95856 - Laserfiche WebLink

Home Browse Search

(d) Wording should be added to specify that significant inflows, which may or may not be pumped, will be recorded and reported to the Division. Please conduct an on-the-ground survey of the surface area within the proposed Sanborn East Tract permit boundary to verify and/or update the Western Slope Carbon spring and seep data previously submitted. The application was deficient in not having current spring and seep information. Also, the application did not propose a monitoring plan to monitor the effects of the mine on the springs. On page 2.04-25 (Rev. 5:3-31-92), the applicant states that the Hawks Nest Mine monitored 11 springs on the north edge of the permit boundary and within the current Sanborn East Tract. This monitoring data is valuable in characterizing the seasonal fluctuations of the springs in the area that will be mined. The Somerset Mine should have resumed monitoring these springs to establish a correlation between the old data and what is occurring currently. In lieu of this, the mine should conduct a spring and seep survey next year and compare this data with that already collected. This will be necessary to establish the baseline. The baseline will be used to see if the proposed mining activity will have a detrimental impact on the springs. Somerset should submit an interpretation of the correlation of the monitoring results of the new data. This should be incorporated into the permit's statement of probable hydrological consequences. The Somerset Mine should also commit to a monitoring plan that will monitor these springs during subsidence. The following is a suggested monitoring plan and schedule for submittal of information. (a) The Somerset Mine will monitor springs and seeps 1 through 6 monthly from March through October. Springs and seeps 7 through 11 wilt be monitored monthly. This will begin when practicable and will continue through the end of 1993. (b) The springs and seeps will be monitored for flow, pH, electrical conductivity and temperature. (c) The data from this monitoring and an interpretation will be submitted o-:ith the 1992 Annual Hydrologic Report. (d) Monitoring will recommence one year prior to retreat mining in the area of the springs and seeps and continue for an additional two years after the area is retreat mined. An interpretation of the results and correlation with past monitoring results will be submitted with the next annual report. (e) For this permit revision, the application should identify the source and use of these springs. 10. Bardine Canyon, A, B and C Gulches, should also be monitored (same schedule as Site U-1). -'-