_INSPECTION - C1981019 ‎(23)‎

• Permit No: C1981019
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 10/14/2009
• Email Name: JRS
• Media Type: D
• Archive: No

Colowyo C-1981-019
14 Oct 2009
Pg 2/6
Hydrologic Balance (cont.): - The East Taylor Pond (NPDES O1 OA) contained water
approximately 9 feet below the top of the discharge pipe and was not discharging
at the time of the inspection. The embankment was well vegetated and stable.
- The West Taylor Pond (NPDES O11 A) contained water approximately 12 feet below
the top of the discharge pipe (approximately 9 feet below the weep hole) and was
not discharging at the time of the inspection. The embankment was well vegetated
and stable. The A-A' underdrain of the West Taylor Fill (and ultimately the West Taylor
Fill itself) toes out approximately 100 feet above the inlet to the West Taylor Pond.
- The Stoker Siding Pond (NPDES 005A) contained water approximately 3 feet below
the top of the discharge pipe and was discharging a trickle out of the weep hole.
The embankment was well vegetated and stable.
- The Section 28 Pond (NPDES 012A) was dry at the time of the inspection. The
embankment still has patchy vegetation but remained stable. The embankment was
reseeded by hand this fall so hopefully more vegetation will come in next year.
- The Prospect Pond (NPDES 007A) contained water approximately 2 feet below the
top of the discharge pipe and was discharging a trickle at the time of the inspection.
The embankment was well vegetated and stable. There was very little sediment at
the inlet of the pond, which was cleaned out last winter.
- The Gulch A Pond (NPDES 004A) was dry at the time of the inspection. The
embankment was well vegetated and stable.
- The Streeter Pond (NPDES 001 A) contained water approximately 2 feet below the
top of the discharge pipe and was discharging at the time of the inspection. The
discharge looked clear and Ryan indicated that he had sampled it earlier in the
week. There was no sediment at the inlet of the pond, which was just cleaned last
winter. The embankment was stable and well vegetated.
- The newly constructed portion of the Final East Pit Ditch was walked during this
inspection. The ditch is a riprapped channel that will convey water from the final cut
of the East Pit to the Prospect Pond. The lower 900 feet of this channel has been built.
Numerous elevation points were taken to construct a profile for the channel. These
elevation points were taken with a Trimble GeoXT unit and are relative elevations, as
they were not based on a control point. While the elevations differ slightly from the
design elevations (due to GPS error), the overall measured grade and profile are
almost identical to the design. Based on the Division's field verification, it appears as
though the lower 900 feet of the Final East Pit Ditch has been built to the approved
designs. Please see the raw data and channel profile comparisons (the Division data
versus the design data) at the end of this report.
- The newly constructed portion of the North Tributary, East Pit Ditch was also walked
on this inspection. This ditch is in the lower portion of the East Pit just north of the final
cut and flows into the Final East Pit Ditch at about station 6+00. The water from this
ditch will also flow into the Prospect Pond. The North Tributary Ditch is a riprapped
channel and the lower 900 feet have been built. As with the Final East Pit Ditch, the
Division took numerous elevation points with a Trimble GeoXT. Based on the Division's
field verification, it appears as though the lower 900 feet of the Final East Pit Ditch has
been built to the approved designs. Please see the raw data and channel profile
comparisons (the Division data versus the design data) at the end of this report.