Buttress Construction Update
25 October 2004

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Trucking

Trucking is significantly completed, however, there may be a few miscellaneous loads over the next few weeks as the site is stabilized for the winter. The additional truckload counts (approximately 900) were a result of off-site fill for the buttress.
• Original total loads estimate: 2,300
• Estimated total number of trucks: 3,200

Tailings Pile 1 (TP-1) Re-grade

The entire section of the re-graded slope is stabilized and well vegetated. Approximately 600 tons of lime and 1,600 tons of compost and manure were placed.

Toe Drain

Toe drain system is complete and functioning.

Buttress Construction

Nearly 65,000 cubic yards of buttress fill were placed, graded, and compacted. Fill was comprised of approximately 10,000 cubic yards of off-site material with remainder from the on-site borrow area. In addition, 14,000 cubic yards of drainage sand were placed under the buttress. Remaining work includes fine grading the slope and crest, and constructing the drain downchute.

Toe Stabilization

The entire toe area has been covered with topsoil and hydroseeded and the majority of the area is well vegetated. Minor rills will be filled with topsoil and seeded before winter. The sediment retention basin will be cleaned before we demobilize from the site.

Upper Tailings Pile 1 (TP-1) Final Grade

Approximately 8 acres on upper TP-1 have been covered with topsoil and hydroseeded. Additional areas may be topsoiled and hydroseeded before winter.

Borrow Area

Restoration of the borrow area is underway. Excavation will be filled and area will be graded to promote surface flows toward the spillway. The area will be covered with topsoil, seed, and hay mulch for the winter. Final restoration will occur in the spring.

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