EMERGENCY REPAIR OF PRINCIPAL SPILLWAY PIPE
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Copyright© Geo/Environmental Associates, Inc. 1995 through 2008
| In June 1996, a leak was observed emerging from the principal spillway pipe of a coal refuse disposal impoundment. Inspection using a robot video camera showed that the 48-inch diameter high molecular weight polyethylene pipe had experienced significant deformation due to excess hydrostatic pressure being exerted on the exterior of the pipe. An emergency grouting program was initiated to fill the pipe with mortar grout. Concurrently, an open channel spillway was excavated to replace the spillway pipe. |  
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Abandonment of the pipe spillway and replacement with an open channel spillway were successfully completed to enable the waste disposal impoundment to resume operation within a few weeks of the discovery of the deformation and rupture of the spillway pipe. |
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