HYDRO23828

• Permit No: C1982056
• IBM Index Class Name: Hydrology
• Doc Date: 9/28/1987
• Doc Name: SECOND QUARTER 1987 SURFACE WATER MONITORING FOIDEL CREEK MINE C-82-056
• From: MLRD
• To: KAREN HELLNER
• Permit Index Doc Type: CORRESPONDENCE
• Media Type: D
• Archive: No

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STATE OF COLORADO

Roy Romer, Gove
DEPARTMENT OF NATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
DAVID C. SHELTON, Director
DATE: September 28, 1987
T0: Karen Hellner
FROM: Cathy Begej '~?'
RE: SECOND QUARTER, 1987 SURFACE WATER MONITORING, FOIDEL CREEK MINE,
C-82-056
I have reviewed the surface water data submitted by Twentymile Coal Company
for compliance with the Hydrologic Monitoring Plan and analytical quality
assurance as I discussed with you earlier. There are three monitoring plans
in effect during the 1987 water year.
Exhibit 10 Foidel Creek Permit Application, Submitted 12/1/83,
Effective 6/21/83.
Exhibit 14 Foidel Creek Permit Application, Submitted 10/85,
Effective 12/22/86.
Exhibit 14R Revised Exhibit 14 from T.R. Plo. 3, Submitted
2/18/87, Effective 4/5/87.
The latter exhibit was used to ascertain compliance with the program. You
might send the operator these three plans to ensure that he understands his
commitments, as the First Quarter, 1987, data submittal showed some omissions.
The only outstanding omission I found in this submittal was a failure to
provide flow for the mine inflow discharge site, No. 109. I did see this data
during the last complete, so it has been collected. Please request that the
operator include it in the future.
I examined two facets of the analytical results: conductivity and mass balance
calculations. The operator appears to have been verifying field conductivity
values with laboratory evaluations on a random basis. Given historical
problems with field conductivity values and the rigors of field sampling, the
operator should be commended and encouraged to continue this practice. Major
discrepancies between the field and laboratory values show up approximately
ten percent of the time. Mass balance determinations on six random samples
showed a major surplus in cations on 6/16/87 during Colorado 14ined Land
Reclamation Division's hydrology inspection. This sampling was in excess of
that required by the HMP for this quarter. The operator should advise the
laboratory to re-analyze those samples, if this is not possible, I would
recommend that the operator eliminate this data from the data base, since it
was an "extra" sample.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]