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Colowyo C-1981-019 16 October 2007 Pg 2/6 Hydrologic Balance: -The wash bay pond (not a NPDES discharge point) contained water approximately two feet below the top of the embankment and was not discharging. This is a total containment pond and discharge into the Work Area Pond triggers BTEX testing (in addition to regular NPDES testing). The operator and the contractors use this pond for water for their water trucks. The pond embankment was well vegetated and appeared to be stable at the time of the inspection. No erosional problems were noted on the pond embankment at the time of the inspection. -The work area pond (NPDES 002A) contained water approximately two feet below the top of the discharge pipe and was not discharging at the time of the inspection. The pond embankment was well vegetated and appeared to be stable at the time of the inspection. No erosional problems were noted on the embankment at the time of the inspection. -The Gossard Pond (NPDES 003A) contained water approximately three feet below the riser pipe and was not discharging at the time of the inspection. The pond embankment was well vegetated and appeared to be stable at the time of the inspection. No erosional problems noted on the embankment at the time of the inspection. The emergency spillway is a 12" culvert. There is sediment in the pond that will need to be cleaned out. - The West Pit Pond (NPDES 008A) contained a small amount of water (below the bottom of the riser pipe at the bottom of the pond) at the time of the inspection. The presettling sump at the inlet of the pond also contained a small amount of water. The pond embankment was well vegetated and appeared to be stable at the time of the inspection. No erosional problems noted on the embankment at the time of the inspection. The emergency spillway is an open, trapezoidal riprapped channel. The spillway was stable and well maintained at the time of the inspection. -The Rail Loop Pond (NPDES OO6A) contained water approximately four feet below the gated pipe and was not discharging at the time of the inspection. The pond embankment was well vegetated and appeared to be stable at the time of the inspection. No erosional problems noted on the embankment at the time of the inspection. -The Stoker Siding Pond (NPDES 005A) contained water approximately three feet below the riser pipe and was not discharging at the time of the inspection. The pond embankment was well vegetated and appeared to be stable at the time of the inspection. The emergency spillway is an open, trapezoidal riprapped channel. The spillway was stable and well maintained at the time of the inspection. -All of the roadside ditches appeared to be stable and in good condition. The Colowyo Mine continues to received large amounts precipitation and everything appears to be holding up well. There were no erosional problems noted in any of the ditches at the time of the inspection.