2013-03-14_REVISION - M1988112 - Laserfiche WebLink

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➢ CDRMS will be notified as soon as reasonably practicable, but no later than 24 hours after BMRI has knowledge of failure in progress or imminent failure; ➢ CDRMS will be notified by telephone during regular business hours (8:00 am to 5:00 pm, on working days); ➢ If the emergency situation occurs outside regular business hours, or if the CDRMS Office cannot be contacted, notice shall be given by telephone to the Colorado Department of Local Affairs, Office of Emergency Management. Specify to this agency, that the emergency authority is coordinated through the Division of Reclamation, Mining and Safety, and to activate that Division's response network. • Possible Slowly Developing Failure Condition: ➢ Notify CDRMS no later than 24 hours after BMRI has knowledge of possible slowly developing failure condition. • As soon as practicable after an emergency situation or condition is reported and addressed, but no later than five working days, BMRI shall provide a written report of the event to CDRMS in accordance with Rule 8.2.3. 4.3.3 Possible Preventative Actions for Emergency Situations The following actions describe some of the steps that could be taken at the tailing facility to prevent or delay failure after an emergency situation is discovered: These actions should only be performed under the direction of the Responsible Party, and CDRMS shall be notified of these actions as soon as reasonably practical: • Emergency Situation: Reduction in Freeboard (< 2 ft) on Dam Crest: ➢ Stop discharging water into the impoundment ➢ Place sandbags along the dam crest to increase freeboard ➢ Protect the dam slopes by placing erosion resistant materials on overtopping or eroding areas ➢ Divert incoming floodwaters around the impoundment area ➢ Lower the water level by pumping or siphoning • Emergency Situation: Slide on Upstream or Downstream Slope of the Dam: ➢ Restore Lost Freeboard by placing sandbags or filling in the top of the slide ➢ Stabilize slides on the slope by weighting the toe area with soil, gravel, or rock ➢ If necessary, lower the pond level by pumping or siphoning • Erosional Seepage through the Dam Embankment, Foundation or Abutments, Connected through to Pond Area: ➢ If the upstream end of the leak can be located, plug it or seal it with soil, bentonite, plastic liner, hay bales, or other available materials ➢ Place sand and gravel over the seepage exit area to provide a weighted filter - protected exit ➢ Lower the pond water level by pumping or siphoning San Luis Project Tailing Dam Safety Inspection and Reporting Program Page 9 of 10