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EFCI Southfield Mine -Year 2005 Annual Hydrology RepoK May 11, 2006 accumulate, initially in the lowest portions of the mine-out workings and gradually rising into other mined-out areas until a dynamic equilibrium is reached between mine water inflows and dischazge to ground water systems. During the reporting period, consumptive water use was limited to minor pond evaporation. Use of the Corley Well as a water source was discontinued in late January 2001. Due to drought conditions over the past few yeazs, the only ponds that have held any significant quantities of water were Mine Ponds 4 and 5. These ponds have partially filled during the spring and held water for 2 to 3 months before drying out. The 2005 pond evaporation is estimated at 0.25 acre-feet similaz to 2003. The source of water for any minor consumptive uses typically is trucked to the site from Florence or Rockvale. No water was trucked to the site during 2005 and it is anticipated that future consumptive water use will be limited to pond evaporation from the remaining sedimentation ponds (Ponds 4, 5, L1, and L2). Total consumptive use for 2005 is estimated at 0.25 acre-feet, as indicated on Table 2, Water Balance and Consumptive Use Summary. TABLE 2 WATER BALANCE AND CONSUMPTIVE USE SUMMARY 2005 2005 rst Qtr . 2nd Qtr. 3rd Qtr. 4th Qtr. Total Quantity CONSUMPTIVE USE (ACRE-FT): 1. Corley Well (Pumped) 0.00 0.00 0.00 0.00 0.00 2. Domestic Use (Trucked from Florence/ROCkvale) 0.00 0.00 0.00 0.00 0.00 3. Dust Control/Washdown (Trucked from Florence/ROCkvale) 0.00 0.00 0.00 0.00 0.00 4. Pond Evaporation (Estimated) 0.00 0.00 0.249 0.00 0.249 Total In ut Water to Mine 0.249 ac-ft DISCHARGES TO STREAMS (ACRE-FT): 1. Sediment Pond Dischar es 0.000 0.000 0.000 0.000 0.000 2. Bypass (NPDES 005) 0.000 0.000 0.000 0.000 0.000 Total Out ut Water from Mine 0.000 Note: Domestic Use estimated at 10 percent of total amount trucked. The water balance compares water source withdrawals (consumptive use) with discharge quantities. Withdrawals previously included any excess mine water pumped from the mine as well as water withdrawn from wells. No water was pumped from the mine or withdrawn from on-site wells during 2005. Consumptive use during the reporting period was limited to only pond evaporation. No pond water was dischazged to area streams in 2005. Given that there were no mine water dischazges during 2005, water quality data from the most recent dischazges (in 2001) aze provided in Table 3, NPDES Dischazge Summary. Historically, all dischazges were within NPDES permit limitations. All samples submitted for WET testing from Outfall 004 (in 2001) were also in compliance. Note that Ponds 1 and 3 have been reclaimed. 0417/2005 annualhydrpt.doc NWCC INC. Pages