2017-01-19_REPORT - C1981025 - Laserfiche WebLink

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MINREC, INC. AHR PAGE 2 Since May 2010 the discharge from Treatment Pond T-2 has been routed from Outfall 001 to sediment pond P-9 and the refuse pile pond. This routing of water is approved as part of the developed water resource post mining land use. The ponds are periodically inspected to determine the water level in each pond. Water flows out of P-9 to the refuse pile pond after P-9 is full. The discharge from treatment pond T-2 will be routed to outfall 001A when the water level in the refuse pond approaches the level of its spillway. It is Minrec's intent to maintain a minimum 2 feet of freeboard in the refuse pond. Monitoring data for this years report is segregated into the following appendices: Appendix No. Monitoring Data North Thompson Creek - Upstream & Downstream Water Quality SURFACE WATER QUALITY Appendix I contains the water quality information collected for North Thompson Creek. The quality information collected on North Thompson Creek, in May and September, is designed to monitor quality at the approximate high and low flow. MINE FLOWS All of the water flowing into the No. 1 Mine flows out through a 6 -inch PVC pipe and into the long pond. Prior to sealing the No. 3 Mine, a point source of spring water located about a mile inside the mine was piped to the surface. The pipeline terminated in the manhole along the road below the No. 3 Mine. A second six inch diameter pipe was installed from immediately behind the No. 3 Mine seals to the manhole. The manhole had an outlet pipe that ran directly under the road to Outfall 007. The good quality water from the spring flowed into the manhole and was discharged directly to Outfall 007 from 1986 through mid 1995. During this period of time the second pipe originating from immediately behind the seals did not discharge. During the second quarter of 1995, wet spring weather caused the mine to fill and the pipe installed immediately behind the seals began discharging iron laden water. The pipeline that conveyed the good quality spring water eventually failed so all of the water being discharged from the mine now flows from the pipeline that was installed from immediately behind the seals to the manhole. In order to treat this iron laden water, a 4 -inch diameter PVC pipe was installed to convey the discharge from the No. 3 mine to the long pond located at the No. 1 Mine. The discharges from the mines were combined effective August 11, 1995. The combined discharge from the mines is treated by the passive water treatment system and then piped to Pond 9, or Outfall 001. Flow from Pond 9 can also be directed to the refuse pond. Outfall 007 is no longer a permitted discharge point.