REV15644

• Permit No: C1980007
• IBM Index Class Name: Revision
• Doc Date: 6/8/1987
• Doc Name: WEST ELK TR FOR REDUCTION OF HYDROLOGIC MONITORING PN C-80-007
• From: MLRD
• To: SUSAN MOWRY
• Type & Sequence: TR54
• Media Type: D
• Archive: No

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5TA E OF COLON ~ ,~
Roy Romer, Govei
DEPARTMENT OFNATURAL RESOURCES
MINED LAND RECLAMATION DIVISION
DAVID C. SHEL70N, Director
DATE: June 8, 1987
T0: Susan Mowry ~~~
FROM: Tom Schreiner
RE: WEST ELK TECHNICAL REVISION FOR REDUCTION OF HYDROLOGIC MONITORING -
PERMIT N0. C-80-007
I have reviewed the technical revision application submitted by WECC in April
fora reduction of hydrologic monitoring at the Mt. Gunnison No. 1 Mine.
Overall, the content of the application and justification for reduced
monitoring was very good. I agree with the applicant's intent to continue
monitoring only those sites which are necessary to determine possible impacts
due to mining during the remainder of the current permit term. I have listed
below five (5) review comments which you may present in your preliminary
adequacy review letter. With the resolution of these five items, I believe
the technical revision request may be granted.
On page 4-68 the applicant states that the Upper Dry Fork Flume will be
relocated to where it can be used to quantify the actual contributions of
the Deep Creek Ditch to the Dry Fork of Minnesota Creek Basin. The
applicant should define (1) when this will occur, (2) the proposed
location, and (3) the potential for disruption of flow data due to beaver
activity. The location of the flume should be determined in consultation
with the Division and the State Engineers Office.
2, The applicant states that frequency of monitoring will be either reduced
or eliminated at various surface water, spring, and groundwater monitoring
locations until the summer before mining impacts can be expected. The
Division requires that monitoring at these various locations be resumed in
force, including all water quality parameters currently measured, at least
one (1) full year prior to expected mining impacts. The one (1) full year
requirement will ensure that all seasonal fluctuations in water flow,
depth, and water quality can ~e measured prior to anticipated impacts.
3. The applicant states that the frequency of future monitoring for surface
water, spring, and ground water monitoring will be reduced to 3 times per
year (start of spring runoff, peak spring runoff, and fall base flow).
This is a logical choice for selection of sampling periods; however, care
must be used to ensure that the true seasons for each of these events are
sampled, especially since the time of these events may vary from year to
year.
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. [phone]