GENERAL40908 - Laserfiche WebLink

Home Browse Search

11.5°, and 14.0°. All four measurements were less than the approved maximum slope angle of 18.43°. D. Surface Water Hydrology and Drainage Control Runoff from all three of these disturbance areas is directed through the main refuse collection ditch to the single mine site sediment pond situated at the west end of the mine. This ditch had been recently regraded, with its temporary catch basin embank- ments entirely removed. As the ditch approaches the sediment pond, it increases in grade. This increased grade section of the ditch has been armored by both grouted riprap and by Reno mattresses (relatively flat gabions). The sediment pond had been recently cleaned out, and the pond's embankment and primary and secondary spillways were all in compliance and in good condition. VI. Additional Investigations A. Review of Surface Water and Groundwater Quality Data The three areas requested for release in this application were afl regraded during 1995. A review of the 1995 quarterly surface water monitoring reports and associated water quality analyses was conducted. The review found that during 1995, discharges from the mine site sediment pond occurred twice: once in June and once in September. Both of these were sampled by the permittce and were found to be in compliance with the conditions and approved exemptions of the permittee's Colorado Pollutant Discharge System permit. Because of the relatively small area (one acre) of these disturbances and their distances from local groundwater levels, it was determined that the activities associated with their reclamation would have little effect on groundwater quality. As such, a review of the groundwater quality data from the Raton Creek Mines was not conducted. B. Review of Reports from Previous DMG Inspections A review of the 1993, 1994, and 1995 DMG inspection reports was conducted. Other than issues with preventing excessive rillying and gullying in the south-facing refuse pile slope, no significant problems were found to have had occurred at these three regraded areas during that time period. VII. Conclusions The Division concludes, based upon the investigations, observations, and evaluations documented herein, that backfdling, regrading, and drainage control for the three areas addressed in partial Phase I Bond Release Request No. SL-03 have been successfully completed by Energy Fuels Mining Company in accordance with approved plans. The Division further concludes that pollution of surface water in the vicinity of these disturbances is not occurring, and that the distance from these disturbances to local 4