HYDRO20401

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Date: 9/12/2002
• Doc Name: Response to request for alternate limits due to snow melt
• From: CDPH
• To: Trapper Mining Inc
• Permit Index Doc Type: DMR’s
• Media Type: D
• Archive: No

STATE OF COLORADO
Bill Owens, Governor
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4300 Cherry Creek Dr. S. Laboratory and Radiation Services Division ;
Denver, Colorado 80246-1530 8700 Lowry Blvd. f"1e76"~
Phone [phone] Denver, Colorado 80230-6928
TDD Line [phone] [phone] Colorado Deparanent
Located in Glendale, Colorado of Public Health
http9/www.cdphesra[e.co.us ~EC~f ~E® and EnVllollment
September 10, 2002 SEP i 2 2002
Karl Koehler
Trapper Mining, Inc. Division of Minerals and Geology
P.O. Box 187
Craig, Colorado 81626
RE: Request for Alternate Limits due [o Snow Melt
For Outfal1011A
CDPS Permit No. CO-0032115, Moffat County
\
Dear Mr. Koehler,
\\
This is in response to your letter dated July 25, 2002, in which you reported a noncompliance with total suspended solids
(TSS) and total iron (iron) effluent limits due to snow melt at Outfall O11A on Apri] 2, 2002. Your letter described the pond
as being properly maintained and operated prior to the event and temperamre charts were included demonstrating a severe
temperature differential which resulted in snow melt during the sampling event. Sampling was conducted on Apri12, 2002 at
approximately 9:20 a.m. at Outfall 01 lA. According to the temperatures, [he high was 67 degrees with a low of 27 degrees
on Apri12, 2002. Your sediment ponds are designed to contain a 10-year/24-hour precipitation event. The self-monitoring
data you provided on your Discharge Monitoring Report is shown below:
Reported
Period Outfall Parameter
2Q02 O11A TSS (mg/1)
2Q02 O11A Total Iron (mg/1)
Permit
Results Conditions
46 (30 day avg) 35 (30 day avg)
3.14 (30 day avg) 3.0 (30 day avg)
Trapper Mining has shown that discharge occurred within 48 hours after measurable temperature differentials, resulting in
snow melt, and a discharge from Outfa11011A which was beyond your control. Therefore, we believe that Trapper Mining
Company qualifies for the less than or equal to a 10-year/24-hour precipitation alternate limit, thus waiving total suspended
_ _ _soGds_and.total iron.effluent.limits. _ . ~ _ _ _- .. ____ ___ _- ____ __ _ __ ___ _-- _ -
If you have any further questions regarding this matter, please contact me at [phone].
Sinc
Carla J. Lenkey
Water Quality P ection Section
WATER QUALITY CONTROL DIVISION
cr. Local Health Department
Jim Chibrilo, D.E., WQCD
dwxnrKaldenbach, DMG
MS-3 File