2006-03-23_REPORT - M1977424 - Laserfiche WebLink

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Logan Wash Mine Annual Report Permit No.: M-7977-424 4.1 Revegetation During the reporting period OOSI conducted mortality inventory of 3,400 saplings planted in 2004 on the Upper and Lower Dumps and planted 316 new saplings in place of dead saplings. This labor-intensive task involved the manual repair or reconstruction of plant "micro" terraces or "V" pockets on the steep rocky slopes of the dumps. The cut face of these excavations was supported by the installation of a silt-fencelike retaining structure using Mirafi ®fabric. Planting involved construction of a hand-dug excavation, the addition of compost soil mix, the installation of an irrigation supplement (polymer), and placement of the plant plug, more soil, a fertilizer tablet, mulch, protective polymer netting over the plant stem, and anchor netting on the mulched surface. Maintenance of these areas included irrigation, fertilization, and structural repairs to the terraces. All transplanted saplings were irrigated one to two times per week by means of gravity feed water systems using clean mine water drainage or imported water stored in a 21,000-gallon frac tank placed on the Lower Bench. Soil was imported from the Soil Barrow Area (TR No. 7) and placed as a minimum 6-inch layer on all surfaces to be seeded including the Upper Bench, Upper Bench Road, Research Mine Bench and outslopes, and the Lower Dump Toe area. The Lower Access Road did not require a soil amendment. Seeding, fertilization, and mulching (crimped certified straw) were conducted on "Lower Dump Toe" (1.64 acres), Lower Access Road (1.0 acre}, Upper Bench and Road (1.4 acres), Research Mine Bench (2.75 acres), and Soil Barrow Area (0.65 acres). In addition, the vent housing area (part of Area 19) was also reseeded. The total reclaimed area was 7.44 acres. 4.2 Mine Debris Removal Crews removed metal, wire, rope, fabric and other miscellaneous debris found on the Upper and Lower Benches and the Research Mine Dump and Bench. This material was transported to the county landfill. 4.3 Storm Water Channel Construction TR No. 5 was prepared as a Storm Water Control Plan for Logan Wash Mine. The plan was requested by DMG after their inspection of September 1, 2004. The TR was submitted to DMG on March 11, 2005 and approved on May 13`". The storm water control work focused on the construction of a 700-ft long rip-rap channel on the Research Mine Bench and two 300-ft long coalescing rip-rap channels on the Lower Bench. Other drainage channels included toe drains and v-ditches along the Upper and Lower Bench roads. 4.4 Design and construction of the Research Mine Drainage Pipeline TR. No. 6, Research Mine Drainage Plan, was submitted on May 23rd to the DMG. The TR was approved on June 24`h, 2005. The BLM approved aright-of--way for this pipeline. The project rerouted the mine drainage outfall for the Research Mine, previously located approximately 70 feet from the sealed portal to the head of the new storm water channel on the Lower Bench, a distance of approximately 3,000 ft. The pipeline alignment follows the Lower Bench Road and connects to the west side of Lower $ench Vault. Valves in the vault will allow sampling of the Research Mine water and regulation or diversion of flow to the Retort Water Pipeline. The pipeline exits the vault below grade and extends to the top of the west rip-rap channel where it Western Water 8 Land, Inc.