Laserfiche WebLink
March 18, 2014 Mr. Wally Erickson <br />Page 3 of 4 <br />readings were submitted previously to the Division in the Monthly Reports and are included in <br />Appendix A of this report. <br />The leak- detection system was monitored monthly and evacuated. The monthly leak- detection <br />flows for 2013 ranged from a low of 23.2 gallons per day (gpd) to a high of 32.5 gpd. The <br />average monthly leak- detection flow for 2013 was 26.6 gpd. The monthly leak- detection flows <br />were submitted previously in the monthly reports. The leak- detection system water was sampled <br />and analyzed quarterly with the laboratory analysis results submitted to the Division in the <br />Monthly and Quarterly Sampling Reports after receipt from the laboratory and are included in <br />Appendix A of this report. <br />Underdrain flows were monitored monthly at the base of the embankment. The underdrain flows <br />for 2013 ranged from a low of 30 gpm to a high of 36 gpm. The average underdrain flow for <br />2013 was 33 gpm. The monthly underdrain flows were submitted previously to the Division in <br />the Monthly Reports and are included in Appendix A of this report. <br />The piezometers at the tailing embankment were monitored monthly. The tailing impoundment <br />piezometers measurements for 2013 were either dry or contained less than 12 inches of water. <br />Therefore the piezometers were not sampled. The monthly tailing impoundment measurements <br />were submitted previously to the Division in the Monthly Reports and are included in Appendix <br />A of this report. <br />Water treatment plant sludge was transferred from the drying pad to the tailings impoundment in <br />February 2013. Approximately 172.5 tons of sludge was transferred during the 2013 calendar <br />year. The monthly sludge management information was submitted previously to the Division in <br />the Monthly Reports and is included in Appendix A of this report. <br />Technical Revisions/Permit Amendments <br />BMRI continues to follow and comply with the current approved technical revision TR -26 (May <br />23, 2000). The alluvial hydrologic system for the Rito Seco and West Pit continued to be <br />managed for 2013 in compliance with TR -26. For 2013, the water management systems have <br />maintained the West Pit hydrologic gradient groundwater elevation at 8582 feet (ft) above mean <br />sea level (amsl) or lower, which is below the Rito Seco stream channel elevation. Maintaining <br />this elevation removes the potential for the West Pit groundwater to percolate to the surface or <br />flow to Rito Seco Creek. <br />Additionally, the two groundwater recovery wells (M -32 and M -33), were operated during the <br />2013 calendar year. Groundwater pumped from these wells was either treated at the West Pit <br />Water Treatment Plant and discharged to the Rito Seco per the Colorado Department of Health <br />and Environments discharge permit, or pumped to the Tailings Disposal Facility for <br />management. In 2013, the West Pit water treatment plan treated and discharged a total of <br />81,068,000 gallons of water to the Rito Seco Creek. Additionally, a total of 18,096,600 gallons <br />or water was transferred from the West Pit back to the Tailing Disposal Facility. Historic <br />seepage locations along Rito Seco Creek were monitored monthly and remained dry for the 2013 <br />calendar year. <br />Technical revision(s) and/or permit amendment(s) were not submitted for the 2013 calendar <br />year. <br />