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Fina] West Elk Mine 2005 Annual Hydrology Report 33 <br />• receives water from surface operations, storm runoff, and effluent from the WWTP. Discharge <br />from MB-2R is typically routed to the North Fork, but can be diverted to Pond FW-1, if necessary. <br />Both Pond MB-1 and Pond MB-2R retain water, so settling of sediment occurs prior to dischazge <br />(batch mode). In WY 2005, pond MB-I had a discharge of 106.0 ac-ft and MB-2R discharged <br />174.5 ac-ft of water to the North Fork. There were two minor CDPS Permit exceedences for the <br />discharge water quality from Pond MB-1 (outfa11016) in the 1~' quarter of 2005 for TSS as detailed <br />in the quarterly Discharge Monitoring Report (DMR) submittals. The reported results for TSS, 30 <br />day average and maximum 7 day average were 42 mg/l and 80 mg/l, respectively, compazed to the <br />permit limits of 35 mg/l and 70 mg/1. Steps were taken to correct the problem and no other <br />exceedences were recorded subsequently. <br />4.3.2 Ponds MB-3, MB-4, and MB-5 <br />Ponds MB-3 and MB-4 receive storm water runoff and wash down water from the Project <br />conveyors, silos, and load out facilities. Pond MB-5 collects only storm water runoff In WY 2005 <br />The combined discharge from ponds MB-3, 4, and 5 amounted to about 1.0 ac-ft. <br />4.3.3 Pond FW-1 <br />• Pond FW-1 is designed to store raw fresh water from the North Fork diversion intake gallery. <br />Pond FW-1 water is pumped to the WWTP and the Project's domestic water system. If the pond <br />overfills, excess water is discharged back to the North Fork. No water was discharged from pond <br />FW-1 in WY 2005. <br />4.3.4 RPE Pond <br />The RPE Pond collects runoff from the refuse pile expansion area. In WY 2005 no discharge <br />occurred from the RPE pond. <br />4.3.5 Pond SG-1 <br />Pond SG-1 was built to collect mnoff during and after construction of the mine ventilation shafts. <br />Discharge from SG-1 is routed to Sylvester Gulch. In WY 2005 pond SG-1 had a discharge of <br />about 1.0 ac-ft. <br />4.4 Bio-Monitoring Testing for Toxicity <br />During WY 2005, MCC conducted bio-monitoring tests as required by the CPDS permit. Bio- <br />monitoring samples were collected quarterly from the West Fork of the Sylvester Gulch effluent <br />discharge (outfall 017). Testing included whole effluent toxicity or "WET" tests. Static toxicity <br />September 2006 AydroGeo, Inc. <br />