_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

STATE OF COLORADO
MINED LAND RECLAMATION DIVISION of coca
Department of Natural Resources
1313 Sherman St., Room 215 �o
Denver,CO 80203
303 866-3567 *1876
FAX [phone]
Roy Romer,
Governor
Fred R Banta,
December 19, 1990 Division Director
Mr. Robert Hagen, Director
Albuquerque Field Office
Office of Surface Mining
Reclamation and Enforcement
625 Silver Avenue, S.W. , Suite 310
Albuquerque, NM 87102
Re: Ten Day Letter Regarding Response to Ten Day Notice 90-02-370-001 , TV2,
Coal Basin Mine
Dear Mr. Hagen:
The Colorado (dined Land Reclamation Division (MLRD) received a letter from
Albuquerque Field Office (AFO) on December 10, 1990 regarding MLRD's response
to TDN 90-02-370-001 , TV2. In this letter, AFO indicated that the TDN issues
are now to be addressed as permit defects identified by a Ten Day letter,
This letter serves as MLRD 's response to the Ten Day Letter.
AFO indicated that there is a defect in the Coal Basin Mine permit which
allowed a permitted pond discharge to occur which was not in compliance with
MLRD Rule 4.05 .5(1 ). This rule requires that sediment control measures using
the best technology currently available be used to: 1 ) prevent, to the extent
possible, additional contributions of sediment to streamflow or to runoff
outside the permit area, 2) meet applicable state or federal effluent
limitations and, 3) minimize erosion. AFO requested documentation that MLRD
is requiring a permit revision incorporating designs and specifications that
address standards 1 and 3 above.
The discharge in question was from the 016 pond series. As a result of past
problems with the 016 ponds, MLRD and the operator investigated options for
improving the treatment of mine discharge water, which currently passes
through the 016 ponds. In October, 1990 the operator submitted a technical
revision to MLRD proposing a new water treatment system. The operator has
proposed a system of physical and chemical treatments underground and within
the preparation plant, after which the treated water will be routed to the 001
ponds. The 016 ponds will then be used as a backup in case of problems with
the water treatment system.
This revision addresses the applicable criteria of Rule 4.05.5(1 ). The
flocculant proposed will remove sediments from mine water prior to discharge
to the surface. The operator has applied for an amendment to their NPDES
permit and all discharges will continue to be required to meet specified
effluent limitations. Diversion and pond designs will handle designed runoff
flows in compliance with MLRD rules so as to minimize erosion.