REV12615

• Permit No: C1980007
• IBM Index Class Name: Revision
• Doc Date: 3/28/1986
• Doc Name: MT GUNNISON 1 MINE PERMIT RENEWAL APPLICATION PRELIMINARY ADEQUACY REVIEW FN C-80-007
• From: MLRD
• To: WEST ELK CO
• Type & Sequence: RN1
• Media Type: D
• Archive: No

PAR - C-80-007 - 4 - March 31, 1986
6. Page 2-392 contains a good discussion of spring characteristics.
_-~ ~ However, the discussion needs to be expanded to include data from
(~ ~ 1981-1985. This is necessary to identify trends, better define
" ~~ baseline, and evaluate the results of monitoring during the first
N,~~Ja'~ permit term.
7. The spring water quality data was compared to water quality
~ guidelines recommended by the Department of Health in 1978. This
~ ~^~ discussion and table (2.8.1.5) needs to be updated to include
current receiving stream standards enacted for the region.
8. Some discussion should be included on the quality characteristics
~~~", of spring water as related to their source. For example springs
issuing from bedrock sandstones may differ in quality from
~ colluvial springs. As subsidence may affect colluvial and bedrock
springs differently, this information is important to consider. A
discussion along with graphical representations of major ion
chemistry would be helpful.
9. Page 2-399 contains excellent discussion of the significance of
~olr ar~~spring flow to the streams in the area, However, this discussion
`.i.~_1~I needs to be expanded to include months other than November,
seasonal variations in streamflow contributions needs to be
included. WECC should re-evaluate the spring contribution to the
streams for years 1977-85. This will show trends and variations in
contributions over the years, and will enable a more accurate
estimate of impacts should the springs be depleted.
9a. The discussion should also be expanded to include an estimate
of the water contribution to streamflow from direct bedrock and
colluvial ground water flow. This is necessary to assess total
impacts to streamflow from depletions. If a spring dries up
due to subsidence, it is probable that the colluvial deposit or
bedrock was also depleted.
9b. Both the spring and colluvial/bedrock contributions to
streamflow should be compared with your water balance
calculations to determine their reliability. Finally, the
predictions should be calibrated by using actual monitoring
data collected from watersheds in the Minnesota Creek drainage.
10. The application should include a discussion and location map of all
~,$.l'~ ~~~waterPostatusdoftuse,wandrowner should beaidentifiedTheInclude of
adjudicated and non-adjudicated users.
11. The application should include a discussion of what the mine water
quality might be expected in the Mt. Gunnison Mine after the
workings are flooded and stagnant conditions prevail. Information
collected from the Oliver Mine Adit, the Sylvester Gulch Adit, and
other flooded workings in the region can be used to support your