HYDRO31226

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Date: 12/19/1997
• Doc Name: CDPS PN CO-0043648 POINT 001 A AMMONIA STUDY
• From: COLO DEPT OF PUBLIC HEALTH AND ENVIRONMENT
• To: CRIPPLE CREEK AND VICTOR GOLD MINING CO
• Media Type: D
• Archive: No

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STATE OF COLORADO
Roy Romer, Governor
Patti Shwayder, Executive Director
Dedicated ro protecting and improving the health and environment of the people of Colorado
4300 Cherry Creek Dr. S. Laboratory and Radiation Services Division
Denver, Colorado 80246-7530 8100 Lowry Blvd.
Phone [phone] Denver CO 80220-6928
Located in Glendale, Colorado [phone]
h[tp://www.cdphe.state.m. us
November 28, 1997
Mr. John Hardaway
Manager of Environmental Affairs
Cripple Creek and Victor Gold Mining Company
P.O. Box 191
Victor, CO 80860
RECEIVED
DEC 19 1991
f1iH;oiarl Bf MinP.r215 rs l-:eui0g'~
Re: CDPS Permit No. CO-0043648 -Point OOIA, Ammonia Study
Deaz Mr. Hardaway;
OF' Cp~
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'tave
Colorado Department
of Public Hnlrh
and Fltvirotuoent
The sampling procedures outlined in your letter of December 23, 1996, aze reasonable and
should provide us with data that can adequately support the ammonia limits that will be of
importance once you begin detoxification of the Valley Leach Facility.
There aze however, several things mentioned in your letter that I would like to comment on:
1) In relation to the monitoring frequency for pH and ammonia that is specified in the pem3it
outside of the ammonia study requirements, it might be possible for us to reduce the
monitoring frequency if past sampling results show that there is little variability in
effluent quality, or that pollutant levels aze not of concern. T1tis might be difficult to do
for pH, but might apply to ammonia. As a result, at least for ammonia, we might be able
to have the monitoring requirements that appeaz in the routine monitoring table and in the
special ammonia study compliance schedule match each other. For pH, not only may the
variability of the data present a problem in reducing monitoring frequency, but the
importance in watching for a pH change - indicating leakage from the VLF - is also a
factor that must be considered. Therefore, while pH monitoring must be conducted at the
higher of the two frequencies specified in the permit for effluent limitation compliance
purposes, only the pH reading taken at the same time that the weekly temperature reading
is taken must be reported in the ammonia study report that must eventually be submitted.
But, since temperature will need to be read when pH measurements aze taken, it might
make sense just to report all individual pH and temperature measurements in the
ammonia study report.