Laserfiche WebLink
Logan Wash Mine Annual Report <br />Permit No.: M-1977-424 <br />4. Isolate and repair the liner. The section of the pond containing the leak(s) will be <br />isolated from the remainder of the pond, water pumped from the section, and the leak will <br />be repaired. <br />5. Assess leak repair. Any repairs to the liner will be confirmed by testing in the pond and <br />flow observations to the detection vault. <br />6. Maintain automated pumping system. The automated pumping system will be <br />maintained until it has been determined that the liner repairs have successfully stopped <br />leakage from the pond. <br />7. Maintain normal monitoring program. Weekly inspections of the pond will occur <br />through the spring runoff (March - May) season. Monthly inspections will continue <br />thereafter. <br />The February 19, 2010 inspection of the vault showed that flow into the vault through the <br />detection collection pipes was 0.13 gpm; only one pipe was flowing. In flow into the pond was <br />measured at 2.3 gpm. On February 24, 2010 a solar panel charger was installed to continuously <br />power the batteries and the sump pump. No flow was entering the vault through the detection <br />collection pipes during this inspection. The plotted water level data (Figure 3) in the vault sump <br />showed that flow into the vault ceased on February 19 about 8 hours after the inspection on that <br />day. Subsequent inspections in March 2010 showed no flow coming into the vault. <br />A working hypothesis that may explain the leak and appearance and eventual conclusion of water <br />entering the vault is that leak water entered the leak detection system through a hole in the liner at <br />a higher water elevation level in the pond. Water was gradually collected and stored in the leak <br />detection drainage system under the liner over time until enough head was present to discharge <br />the water to the vault. After the water level in the pond dropped, the leak ceased and the leak <br />detection system discharged stored water into the vault until all storage was depleted. <br />This hypothesis would indicate that the priority in locating possible liner holes or cracks be <br />conducted on the liner slope within a foot or so of the existing water line. Preliminary liner <br />inspections were conducted in March 2010 with several small holes discovered above the existing <br />water line. Liner repair is planned for early April 2010. Additional liner inspections will be <br />conducted. <br />6.0 Anticipated Reclamation in the Year 2010 <br />Because the fate of mine water discharge is being assessed under Amendment No. 1, OOSI does <br />not anticipate reclamation of any roads or disturbed surface areas at the mine site in 2010. <br />However, Wells LW-32, LW-45, LW-116, and LW-22, are scheduled to be abandoned in 2010. <br />Specific reclamation maintenance activities expected to be conducted during 2010 may consist of <br />maintenance of existing planted native shrubs on the Upper and Lower Mine Dump slopes. If <br />determined necessary, maintenance may include installation of irrigation supplements, irrigation <br />with available mine water and possibly imported water sources, some plant replacement, terrace <br />and pocket repairs, fertilizing, and mulching where necessary. Evaporation Pond maintenance <br />will be conducted as needed, some liner repairs may be required. Roads not reclaimed will be <br />maintained. <br />7.0 Anticipated Disturbance in the Year 2010 <br />No new disturbance is anticipated to occur in 2010 within the mine permit area associated with <br />OOSI mine permit activities. <br />Western Water & Land, Inc.