HYDRO30153

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Date: 7/20/1995
• Doc Name: UDATING THE ESTIMATION OF ACTION LEAKAGE RATES LVSCS AND LDS MONITORING THROUGH JULY 3 1995 PN C-80-
• From: DMG
• To: BERHAN KEFFELEW
• Media Type: D
• Archive: No

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999
STATE OF COLOlZADO
DIVISION OF MINERALS AND GEOLOGY
Depanment of Natural Resources
1313 Sherman A., Roam 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
DATE: July 20, 1995
TO: Berhan Keffelew
FROM: Jim Pendleton
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DEPARTMENT OF
NATURAL
RESOURCES
Roy Ramer
Governor
lames S Lochhea8
Executive Dueclor
Michael B Lont;
Division Director
RE: Updating the`me`s unation of Action Leakage Rates;
LVSCS and LDS Monitoring Through July 3, 1995
(Permit: C-80-244)
I have reviewed the information submitted by Cripple Creek & Victor Gold (CC&VG) updating
the Action Leakage Rates, which I requested earlier this year. This information, prepared by
Golder Associates for CC&VG, will support enforcement implementation by the Division at the
Cresson Mine site. This tabulation of acceptable leakage rates for the four exceedence levels
versus pregnant solution levels, clarifies the original figures 4.1 and 4.2 within the revision Mb
application. The Division may now monitor pregnant solution elevation at the pregnant pond
well cans, determine the previous day's pumped volume from the Low Volume Solution
Collection System (LVSCS), and thereby determine which action level the company is presently
subject to.
In addition, I have also reviewed the monitoring data for the LVSCS and the Leak Detection
System (LDS) sumps from January 3, 1995 through July 3, 1995. My review allows me to
make the following observations.
Condition of the Monitoring Apparatus
The monitoring data report contains several data gaps. Most importantly, the transducers on the
pumps in the LVSCS pregnant solution sump have ceased to function on several occasions. The
two pumps and two transducers were intended to provide redundancy. Mr. Hardaway
hypothesizes that ground static charge due to local lightning strikes have dannaged the
transducers. It appears that transducer Jt2 ceased to function on or about May 9th. Transducer
X1 subsequently ceased to function on or about May 19th. It appears that neither transducer was
replaced until June 21, 1995. It then appears that both transducers failed again on June 22nd,