GENERAL53312

• Permit No: M1980244
• IBM Index Class Name: General Documents
• Doc Date: 6/24/1994
• Doc Name: REVIEW GEOCHEMICAL EVALUATION OF POTENTIAL UNDERDRAIN MATERIALS COMMITMENT 36 CRIPPLE CREEK & VICTOR
• Media Type: D
• Archive: No

• • iii iiiiiiiiiiiu iii
STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmenl of NaNral Resources
1313 Sherman St., Room 215 r

Denver, Colorado 80203 ~
~~~

Phone: [phone] I
FAX: [phone]
DEPARTMENT OF
NATURAL
RESOURCES
Roy Romer
Goeernor
lames S LochheaA
EKecmive Director
hLChael 8. Lnng
DATE: June 24, 1994 orvision Director
TO: Berhan Keffelew/{~'~~'~`'`~
FROM: Harry Posey sZ /
RE: Review: Geochemical evaluation of potential underdcain materials;
Commitment No. 36; Cripple Creek & Victor Gold; Cresson Project; Permit
No. M-80-244
BACKGROUND
Commitment No. 36 covers testing of materials to be used for the Arequa Gulch Underdrain.
The testing for this commitment required verification that the materials would be durable, non-
slaking, and chemecally inert. Chemical inertness was to be measured using (a) the Meteoric
Water Mobility Procedure to simulate the soaking and flushing that might be anticipated under
a single storm event and (2) appropriate acid generation test. This review covers the chemical
testing portion of the Commitment No. 36 response.
The testing has proceeded on the assumption that the only metals of concern are those that are
applicable to the surface water discharge permits. A letter from B. Keffelew to CC&V, April
18, 1994, identifies some of the water quality parameters for which leaching data were needed.
CC&V tested ten samples from five wells for 29 parameters. Many of those parameters are not
regulatable either under surface water or groundwater programs of the Clean Water Act. These
will not be considered.
APPLICABLE STANDARDS
At issue is whether the water that will flow through the Arequa Gulch Waste Rock Underdrain
and the Valley Heap Leach Underdrain will be subject to surface water regulations, groundwater
regulations, or both. Surface and groundwater water flowing through the underdFain and into