2012-03-26_REVISION - M1977493 - Laserfiche WebLink

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SECTIONSIX Monitoring and Inspection • Signs of erosion, displacement, or additional cracking (if applicable) • Abnormal conditions (if applicable) Additional detail for monitoring is included below. Upstream and Downstream Slope and Dam Crest Inspect all portions of the beach, dam crest, and downstream slope for erosion, distortion, or cracking. Visually inspect the downstream face for leakage and seepage and document any differences from normal leakage patterns in the inspection checklist. Inspect the slopes in the vicinity of the dam for any indications of impending landslides or other signs of distress. Inspect the dam crest for debris. Remove debris as soon as removal can be conducted safely. Inspect the tailing beach area for erosion, distortion, or cracking. Additionally, check that the beach width has not become less than 500 feet using an electronic distance meter or other suitable method. Decant Pond Observe the general location of the decant pond and water elevation relative to the crest. The distance from the edge of the decant pond to the crest of the dam will be noted. Document obstructions or debris observed in the decant pond. A minimum of 6 feet of freeboard, as measured from the crest, should be maintained within the decant pond at all times under normal conditions. If the pond reaches a higher level, then the site will begin dewatering procedures until the level reaches the minimum freeboard requirement. Unusual discoloration of the water pool will be noted as this could be an indication of subaqueous sludge migration or sloughing. The water being discharged off the pond through the Tenmile Decant should be relatively clear and free of significant suspended solids and tailing slimes. Abnormal Conditions Contact management personnel immediately if any abnormal or unusual observation is made. Unusual or abnormal observations include, but are not limited to, the following: • Wet spots or visible seepage (or increase in seepage in areas already identified) on the embankment • Piezometric levels that trigger the system alarm (trigger levels pending) • Variation in vegetation color or density that might indicate seepage • Significant increase in measured levels of seepage • Sink holes • Sliding, slumping, or cracking of the downstream slope, crest, and abutments • Significant erosion features on the face of the dam • Unusual discoloration of the water pool • Discoloration or evidence of tailing slimes in the Tenmile Decant. N TROJECTS122242095 __CLIMAX_STARTUP PROJ\SUB_W112 O WORD PROCITENMILE O &M1FINAL RPTITENMILE OW PLAN FINAL_R3 DRMS DOCX 6 -2