Skin slide or slough on Watch Examine rest of embankment for other slides. Stakes, tape Distance slope of embankment. Place stakes in slide material and adjacent to measure between Slides or severe No further movement of it for determining if further movement is taking stakes slide and embankment place. erosion crest not degraded. Slide or erosion involving Watch Initiate 24-hour surveillance. Mobilize all Dozer, shovels, Distance large mass of material, available resources and equipment for repair sources of between crest of embankment is operations to increase freeboard and to earthfill, stakes degraded, no movement protect the exposed embankment material. sandbags or very slow continuing Start filling sandbags and stockpile near slide movement. area. Slide or erosion involving Possible Continue monitoring and remedial actions as Dozer, shovels, Distance large mass of material, Failure described above. Place additional material at source of between crest of embankment is the toe of the slope to stop the slide. earthfill, pump stakes degraded, progressively increasing in size. Slide or erosion involving Imminent Downstream evacuation. Utilize all available Dozer, shovels, Distance large mass Failure equipment and personnel to sandbag the sandbags, between of material, crest of degraded slide area to prevent it from pump stakes embankment is severely overtopping. degraded, movement of slide is continuing and may reach pool level. Sinkholes anywhere Watch Carefully walk the entire embankment and Stakes, Size, on the embankment downstream area looking for additional flagging location Sinkholes or within 500 feet sinkholes, movement, or seepage. downstream from the toe. Sinkholes with Watch Initiate 24-hour surveillance. Monitor as Dozer, shovels, Size, corresponding seepage above. Construct sandbag dike around the pump location anywhere on the seepage exit point to reduce the flow rate. embankment or Start filling sandbags and stockpile near downstream from sinkhole. the toe. Large sinkholes with Possible Continue monitoring and remedial action as Sandbags, Size, corresponding seepage failure described above. Utilize sandbags to dozer, pump location anywhere on the increase the freeboard on the dam if embankment or necessary. downstream from the toe. Sinkholes rapidly getting Imminent Downstream evacuation. Utilize all available Dozer, shovels, Size, worse, seepage flowing failure equipment and personnel to attempt to pump location muddy water and construct a large ring dike around the area. increasing flow. 5 Equipment, General Specific Material and Data to Observation Observation Condition Emergency Action Supplies Record
Slides or severe erosion Skin slide or slough on slope of embankment. No further movement of slide and embankment crest not degraded. Watch Examine rest of embankment for other slides. Place stakes in slide material and adjacent to it for determining if further movement is taking place. Stakes, tape measure Distance between stakes Slide or erosion involving large mass of material, crest of embankment is degraded, no movement or very slow continuing movement. Watch Initiate 24-hour surveillance. Mobilize all available resources and equipment for repair operations to increase freeboard and to protect the exposed embankment material. Start filling sandbags and stockpile near slide area. Dozer, shovels, sources of earthfill, sandbags Distance between stakes Slide or erosion involving large mass of material, crest of embankment is degraded, progressively increasing in size. Possible Failure Continue monitoring and remedial actions as described above. Place additional material at the toe of the slope to stop the slide. Dozer, shovels, source of earthfill, pump Distance between stakes Slide or erosion involving large mass of material, crest of embankment is severely degraded, movement of slide is continuing and may reach pool level. Imminent Failure Downstream evacuation. Utilize all available equipment and personnel to sandbag the degraded slide area to prevent it from overtopping. Dozer, shovels, sandbags, pump Distance between stakes Sinkholes Sinkholes anywhere on the embankment or within 500 feet downstream from the toe. Watch Carefully walk the entire embankment and downstream area looking for additional sinkholes, movement, or seepage. Stakes, flagging Size, location Sinkholes with corresponding seepage anywhere on the embankment or downstream from the toe. Watch Initiate 24-hour surveillance. Monitor as above. Construct sandbag dike around the seepage exit point to reduce the flow rate. Start filling sandbags and stockpile near sinkhole. Dozer, shovels, pump Size, location Large sinkholes with corresponding seepage anywhere on the embankment or downstream from the toe. Possible failure Continue monitoring and remedial action as described above. Utilize sandbags to increase the freeboard on the dam if necessary. Sandbags, dozer, pump Size, location Sinkholes rapidly getting worse, seepage flowing muddy water and increasing flow. Imminent failure Downstream evacuation. Utilize all available equipment and personnel to attempt to construct a large ring dike around the area. Dozer, shovels, pump Size, location 5 General Observation Specific Observation Condition Emergency Action Equipment, Material and Supplies Data to Record
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