_INSPECTION - C1981019 ‎(58)‎

• Permit No: C1981019
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 9/9/2008
• Email Name: JRS
• Media Type: D
• Archive: No

Colowyo C-1981-019
9 September 2008
Pg 2/4
Hydrologic Balance: - The Gossard Pond (NPDES 003A) contained water
approximately four 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.
- The Rail Loop Pond (NPDES OO6A) was not inspected because there was a train
being loaded.
- The Prospect Pond (NPDES 007A) contained water approximately six feet below the
top of the riser (to the bottom weep hole) but was not discharging at the time of the
inspection. There was a small amount of water flowing into the pond at the time of
the inspection. This pond was inspected on 11 September 2008, a day after the site
was hit by thunderstorms and rain (sometimes very heavy). The pond was not
receiving any inflow from the storm at the time it was inspected. Last inspection
Colowyo was issued Notice of Violation CV-2008-004 for water topping over the
embankment of the Prospect Pond. Please see Section IV of this report for more
details regarding the NOV. The pond embankment still has a fair amount of debris
and mud on it from last month's storm but it remains well vegetated and appears to
remain stable. The emergency spillway is a grouted, riprapped open channel. There
were no erosional problems noted on the pond embankment at the time of the
inspection.
- The lower portion of the Section 16 Perimeter ditch, to where it intersects the South
Collection Ditch, was walked on 10 September 2008. This ditch collects runoff from
the mostly reclaimed portions of the Section 16 Pit and Section 16 Fill areas. The ditch
was stable and well vegetated at the time of the inspection. No erosional problems
were noted in the ditch at the time of the inspection.
- The South Collection Ditch was walked in its entirety on 10 September 2008. The
South Collection Ditch collects runoff from the Section 16 Fill, The Prospect watershed
of the East Pit and some associated undisturbed areas and routes it to the Prospect
Pond. The ditch is alternately grass-lined and riprapped, depending on the slopes
encountered. The ditch appeared to be stable and there were no areas where
there was a build-up of sediment or where the ditch needed to be cleaned. No
erosional problems were noted in the ditch. While we were walking this ditch it was
raining (very hard for about 45 minutes). Although there were heavy rains, there was
no immediate runoff from the surrounding areas and there was no flow in the ditch
(the only water in the ditch appeared to be the water that hit the ditch itself). An
area of concern prior to walking this ditch was how it withstood the storm event last
month that caused the Prospect Pond to top over the embankment. On this
inspection no problems were noted in the South Collection Ditch as a result of last
month's storm or any other storm events.
- The East Side Collection Ditch was also walked on 10 September 2008. Th East Side
Collection Ditch collects water from the reclaimed Gulch A watershed in the East Pit
and a small amount of associated undisturbed area and routes it to the Gulch A
Pond. There was a fair amount of rain falling while we were walking this ditch as well,
although there was no immediate runoff or water flowing into the ditch.