_ENFORCEMENT - C1981017 ‎(5)‎

• Permit No: C1981017
• IBM Index Class Name: Enforcement
• Doc Name: Bid Documents ‎(IMP)‎ TDN X-90-02-370-001- TV2
• Media Type: D
• Archive: No

-0• �
STATE OF COLORADO
MINED LAND RECLAMATION DIVISION of
Department of Natural Resources �`� Co,:0
1313 Sherman St., Room 215
Denver.CO 80203
303 8 6 6-3 5 6 7 * `7
FAX [phone] 1g6
Roy Romer,
Governor
DATE: November 5s 1990 Fred Divisi o Banta,
on Director
TO: Jim Stevens
FROM: Larry Routten
RE: NOV's C-90-049, C-90-050, C-90-051 and C-90-052
In order to assist you in your assessment of the NOV 's issued to Mid-Continent
on October 23, 1990, this memo includes some additional background information
not included in the inspection report. Please let me know if I can answer any
additional questions.
NOV C-90-049
Neither of the two ponds cited in the violation exhibited signs of imminent or
past failure in handling surface runoff. The toe embankment of the No. 4 Mine
pond was probably not up to specs (steep outslope ) but, it was relatively
stable. The 3 Mine pond appeared stable and functional .
The problem with these ponds in my estimation , is restricted to the fact that
they were not built as designed. I saw no apparent s tab i 1 i ty or functional
problems.
NOV C-90-050
The road drainage problems cited on Road C (to the No . 4 Mine) appeared to be
the result of several years of degradation. I do not believe there were any
recent drastic changes in the condition of the ditches or culvert outlets
cited. There has been some very significant erosion in the ditches,
especially at RD-5.
The culvert outlets cited do not appear to be in danger of any immediate
drastic degradation. They have undergone considerable downcutting in the past.
Culvert C-3 (the 8 ' diameter pipe ) is in need of replacement. It is still
capable of functioning to a large extent in its current condition. If a
significant flow were to pass through the culvert, the vast majority would
still flow through the culvert (unless it came apart at one of the
deteriorating seams). The integrity of the structure is in jeopardy, as
evidenced by the deteriorating inlet and outlet ends of the CMP and the piping
at the outlet ena,