REP16139

• Permit No: C1981047
• IBM Index Class Name: Report
• Doc Date: 10/13/1994
• Doc Name: 1993 AHR comment response
• From: MINREC INC
• To: DMG
• Annual Report Year: 1993
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

•~- y MINREC, INC .
2768 COMPASS DRIVE, SUITE 101
GRAND JUNCTION, COLORADO 81506
PHONE: [phone], FA 242-7908
BLUE RIBBON MI1~ ~ A ~ ~ ~~ ~ ~~
October 11, 1994
C. E. Johnston
Division of Minerals and Geology
1313 Sherman St., Room 215
Denver, CO 80203
Re: Blue Ribbon Mine
Annual Hydrologic Reports
Permit No. C-81-047
Dear Ms. Johnston:
OCT 131994
Dl~i,g~_. , ;~
MINERq~~ & Gt=O n„v
III IIIIIIIIIIIIIIII
999
The Division's letter dated September 2, 1994 transmitted its
comments regarding the Blue Ribbons Mine's annual hydrologic
report. Following are Minrec's responses to the Division's
comments:
Section I:
1. The quality measurements for Hubbard Creek are sampled at the
locations identified on Exhibit Z - Monitoring Location Map.
The information regarding surface monitoring points presented
on Exhibit P is outdated. The flow for Hubbard Creek is
estimated at the 9-foot culvert because it is a convenient
location. The 9-foot diameter culvert is a practical location
to measure the velocity of flow through a regular channel.
The last sentence of flow methods in the annual hydrologic
report is incorrect. The sentence should state "The flow from
the bench underdrains is determined by timing flow into a
container of known size". This sentence will be corrected in
future annual hydrologic reports.
2. A single flow measurement is taken for Hubbard Creek to
estimate the flow in the creek. The flow measurement is
applicable to both the upstream and downstream monitoring
stations. Obviously, there is no attempt to determine if the
mine is depleting the flow in Hubbard Creek. However, a
single flow measurement does provide the information necessary
to estimate the impact a sediment pond or other mine related
discharge would have on the quality of the flow in the creek.