GENERAL32427

• Permit No: C1981034
• IBM Index Class Name: General Documents
• Doc Date: 10/9/1984
• Doc Name: STIPULATION 1 RESPONSE FN C-034-81
• To: MLR
• Permit Index Doc Type: STIPULATIONS
• Media Type: D
• Archive: No

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October 9, 1984
Mr. Dan Mathews
Reclamation Specialist
Colorado Mined Land Reclamation
1313 Sherman Street, Room 423
Denver, CO. 80203-2273
RF: Stipulation ;Y1 Response,
File ~tC-034-81
Dear Dan:
Firs! and Columbia
P. O. F''cx 22G
Delta, Gnio. 81416
Office: (3 J') 874-7561
Mine: (303) 85G-6402
The following information on Stipulation i;l is being submitted in
response to your letter of September 12, 1984:
The 2~i-hour underground mine water storage was based upon
previously accepted calculations (page 99 of the Permit)
and upon the fact that the pumping can be manually controlled
and, therefore, can be stopped if a conflict in water storage
looks imminent. If discharge approaches the 26.1 9pm esti-
mated, the pu;nps will likely be set up on a float switch to
discharge at least daily.
Mine water is primarily settled u:derground in a series of
sumps which would have an average retention time of two days
if we were to reach the 26.1 gpm discharge projected. The
highest'total suspended solids' measured in the last three
years leas been 52 mg/1, trhich equates to 0.0022 acre-feet/
year of sediment, if 100 settling occurred. The problem
with suspended solids occurred tvllen the mine water did not
go through any sump, but went directly outside.
A quarterly survey of th
of a calculation fro;n tl
to the sediment level at
sedim=nt deptfr .:ear the
of this calcu' .ton will
pond inspection.
e sedi;nent in tfre pond will consist
e measurement of the sediment deposited
the intake end of the pond and the
discharge end of the pone. The result
be a part of the quarrterly sediment
Attached is a certified drawing of a cross-section through
the existing sediment pond dam. The pond was designed
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