_INSPECTION - C1981019 (57) - Laserfiche WebLink

Home Browse Search

Colowyo C-1981-019 18 August 2009 Pg 2/9 Hydrologic Balance: - The Gossard Pond (NPDES 003A) contained water approximately four feet below the discharge pipe and was not discharging at the time of the inspection. This pond has remained relatively sediment-free since Colowyo constructed the sump at the inlet several years ago. The pond embankment was well vegetated and stable and no erosional problems were noted. - The Rail Loop Pond (NPDES 006A) contained a small pool of water two feet below the gated discharge pipe and was not discharging at the time of the inspection. The large pile of coal fines that was along the edge of the pond has been removed. The pond embankment was stable and well vegetated. No erosional problems were noted. - The Stoker Siding Pond (NPDES 005A) contained water approximately four feet below the top of the discharge (to the weep hole) and was not discharging at the time of the inspection. The pond embankment was well vegetated and stable and no erosional problems were noted. - The Prospect Pond (NPDES 007A) contained water to the weep hole (approximately six feet below the top of the discharge pipe) and was discharging an immeasurable trickle at the time of the inspection. There was a small amount of sediment at the inlet to the pond but the sediment control measures implemented in the disturbed area and reclamation above appear to be helping. The pond embankment was well vegetated and stable and no erosional problems were noted. The road spur to the pond remains stable. - The Gulch A Pond (NPDES 004A) contained water approximately five feet below the top of the discharge pipe (three feet below the weep hole) and was not discharging at the time of the inspection. This pond was cleaned recently and there was no sediment at the inlet. Ryan Pawlowski indicated that the pond sediment level was surveyed and it was within design limits. The pond embankment was well vegetated and stable and no erosional problems were noted. The emergency spillway is a riprapped, open channel. The spillway has filled in with grass over the years but still appears functional. - The Streeter Pond (NPDES 001 A) contained water approximately two feet below the top of the discharge pipe and was discharging from the weep hole on the pipe. The discharge was clear at the time of the inspection. There was no water flowing into the pond from the ditch along the north side of the Streeter Fill at the time of the inspection. The pond embankment was stable and well vegetated and no erosional problems were noted. The emergency spillway was stable at the time of the inspection. - The Section 28 Pond (NPDES 012A) contained a small amount of water but was not discharging at the time of the inspection. There was a small amount of sediment at the inlet of the pond from the runoff but is not a problem at this time. The vegetation (mainly the grasses) on the embankment continues to grow, although there are some bare patches in the vegetation. Colowyo should interseed the Section 28 Pond embankment this fall to ensure good vegetative cover. The open channel emergency spillway remains stable.