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2. Install CHIP per manufacG.irer' s recommendation and backfill . <br />3. Riprap or install entrance and exit headwalls, as necessary. <br />• <br />Material Required - Corrugated Metal Pipe - Iocal suppliers(4-hour <br />delivery). No corrugated metal pipe required on mine site. <br />AFtI1C0 P7eta1 Products Division, 2162 Highway 6 & 50, Grand Junction, <br />CO 81501, phone - 242-7051. <br />Wheeling Corrugating O~mpany, 2749 Highway 50, Grand Junction, CO <br />81501, phone - 243-1156. <br />Repair Procedure - Long~I'erm <br />Significant Ponds <br />The short-term repair of a pond will be satisfactory for long-term <br />effects. 'Ihe subsidence crack should close up due to relocation of the <br />subsidence-induced tension zone and natural healing due to erosion and <br />• sedimentation. <br />Ctroamc <br />1. Excavate and remove temporarily placed (T7P. <br />2. Backfill, if necessary, subsidence crack with native materials. <br />3. Install Bentonite clay or plastic pond liner material over crack, <br />if necessary, per manufacturer's recrnmendation. <br />Material kequired - The material required is the same as for a pond <br />repair, stated previously. <br />Equipment Required - C4dI-owned backhce, CWI-owned front end loader. Hand <br />tools are maintained in inventory at the Orchard Valley Mine. <br />• <br />