REP10089 - Laserfiche WebLink

Home Browse Search

• Sanborn Creek Mine 1995 Annual Hydrologic Report flow at S-1. For this reason, S-2 is monitored only if S-1 has flow. S-1 was monitored monthly, with flow recorded in March, April, May, and June during spring run-off. Since S-1 had flow, S-2 was monitored in March, April, May, and June. In March and June, the quarterly full suite of surface water parameters was analyzed. Surface water monitoring point P-1 is located in a sediment trap drop inlet located near the portal area. This monitoring point is designed to assure that the surface run-off from Small Area Exemption A and C meets the requirements of Rule 4.05.2(3). P-1 was monitored monthly, with no flow recorded in any month. Since there was no flow at this monitoring station, there were no samples to analyze for settleable solids. Stipulation 14 to the permit required Somerset Mining Company, the operator prior to Oxbow Carbon & Minerals, Inc., to submit sediment control demonstrations for all small area exemptions located on the Somerset/Sanborn Creek Mine permit area. Oxbow Carbon & Minerals, Inc. will monitor the flow from the small area exemptions to assure compliance with 4.05.2(3). Oxbow Carbon & Minerals, Inc. will use its best efforts to obtain samples. • The samples will be analyzed for pH, conductivity, and total settleable solids. Samples will be in compliance if they contain settleable solid levels of 0.5 ml/1 or less and the pH is greater than 6.5 and less than 9.0. Once two samples are taken that confirm compliance, no further sampling will be required unless requested by the Division. Results of the analytical analysis of the sample(s) will be included with each year's annual hydrologic report. On September 30, 1994, during a storm event, and on February 13, 1995, during a snow-melt event, samples were obtained for SAE-2. The area protected by this SAE is the cemetery access road, water tank, and all areas above. The run-off from this area was directed along the cemetery access road to a U-shaped concrete foundation for the cattle guard in the Elk Creek access road. The water that passed through this foundation must pass through a silt fence before it is discharged into Elk Creek. The sample point was the point where the water cascades off the U-shaped concrete foundation. Results of the analysis are included in Appendix 2. During the last two weeks of 1995, partial construction of the Elk Creek Coal Stockpile, originally approved in Technical Revision No. 9, with the partial construction approved in Minor Revision No. 34, was completed. This construction changed the location of the silt fence for SAE-2. The silt fence now discharges into a culvert •