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_INSPECTION - C1981019 (55)
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_INSPECTION - C1981019 (55)
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Entry Properties
Last modified
11/6/2020 2:59:27 PM
Creation date
8/29/2008 3:41:19 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
INSPECTION
Doc Name
Inspection Report
Inspection Date
8/13/2008
Email Name
JRS
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Colowyo C-1981-019 <br /> 13 August 2008 <br /> Pg 2/4 ��' <br /> Hydrologic Balance: - The Gossard Pond (NPDES 003A) contained water <br /> approximately three feet below the riser pipe and was not discharging at the time of <br /> the inspection. The pond embankment was well vegetated and appeared to be <br /> stable at the time of the inspection. No erosional problems noted on the <br /> embankment at the time of the inspection. The emergency spillway is a 12" culvert. <br /> - The Rail Loop Pond (NPDES OO6A) contained water approximately two feet below <br /> the gated valve and was not discharging at the time of the inspection. The pond <br /> embankment was well vegetated and appeared to be stable at the time of the <br /> inspection. No erosional problems noted on the embankment at the time of the <br /> inspection. <br /> - The Prospect Pond (NPDES 007A) contained water approximately six feet below the <br /> top of the riser (to the bottom weep hole) and was discharging an immeasurable <br /> trickle at the time of the inspection. There was still a small amount of water flowing <br /> into the pond at the time of the inspection. This pond appeared to receive the brunt <br /> of the storm over the past weekend. According to the operator, the pond's <br /> watershed received 1 .66 inches of rain on 9 August 2008 (as well as 0.06 inches of rain <br /> on 6 August and 0.09 inches on 7 August 2008). Of this rain, approximately 0.8 inches <br /> was received in 15 minutes and 1 .19 inches was received in 45 minutes. This rain led <br /> to the pond's trash rack being clogged and the pond filling to a point where <br /> discharge occurred through the emergency spillway and ultimately over the top of <br /> the embankment itself. There was a great deal of sediment in the pond inlet, <br /> including larger rocks/cobble, and a great deal of debris on the pond embankment <br /> (on both the inslopoe and outslope of the embankment). The pond embankment <br /> appears to still be stable despite the water topping over it. As a result of the trash <br /> rack clogging, water flowing through the emergency spillway from an event that was <br /> less than the 10-year, 24-hour storm event and water topping over the pond <br /> embankment, Colowyo was issued Notice of Violation CV-2008-004. Please see <br /> Section IV of this report for more details regarding the NOV. Additionally, please see <br /> the accompany photographs of the Prospect Pond at the end of this report. <br /> - Prospect Pond Ditch, Drainage and Watershed -The drainage to the prospect <br /> pond was walked (as much as could be safely walked due to the steepness and <br /> large rocks) to assess the damage from the weekend's storm event. Overall, the <br /> main drainage leading into the pond through the undisturbed area appears to have <br /> held up well. Most of this undisturbed area of the drainage is down to competent <br /> sandstone. The high water mark in the drainage was as high as 10-12 feet in some <br /> areas, as evidenced by the way the grass was laying down and the debris that <br /> washed into the drainage. He Prospect ditch has been partially riprapped and there <br /> was evidence of side-cutting and erosion from the ditch itself. The lower portion of <br /> the ditch that has not been riprapped did show signs of erosion as well. This damage <br /> will need to be repaired and the ditch will need to be completed to ensure its future <br /> stability and ability to handle the designed flows. Much of the disturbed portion of <br /> this watershed appears to be ungraded spoil (on the lower portion of the watershed). <br /> This may have contributed to the large amount of runoff and sediment that reached <br /> the pond. There are two large gullies to the north and south of the Prospect Ditch <br /> that have developed. Please see the pictures at the end of this report. <br />
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