HYDRO21101

• Permit No: C1981019
• IBM Index Class Name: Hydrology
• Doc Date: 10/23/1998
• Doc Name: REQUEST FOR ALTERNATE LIMITS DUE TO SNOWMELT
• From: CDOH
• To: COLOWYO COAL CO
• Permit Index Doc Type: DMR’s
• Media Type: D
• Archive: No

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STATE OF COLORADO ~' ~
Ray Ramer, Governor
Patti Shwayder, Executive Direaor
Dedicated to protecting and improving the health and environment olthe people of Colorado
4300 Cherry' Creek Dr. 5.
Denver, Colorado 80146-7530
Phone [phone]
Located in Glendale, Colorado
h ttp://www.cdphe.state.co.us
October 21, 1998
Laboratory and Radiation Services Division
8700 Lowry Blvd.
Denver CO 80220-6928 r
1303) 692-3090 I
James A. Kiger
Colowyo Coal Company
5731 State Highway 13
Meeker, Colorado 81641
RECEIVED
OCT 2 3 1998
DIV. OF MINERALS
BGEOLOGY
„' p4 Cp~
.~•
't»s•
Colorado Deparunent
of Public Hdth
and Environment
RE: Request for Alternate Limits Due to Snotumelt
CDPS Permit No,: COG-850017
Moffat County
Dear Mr. Kiger:
On October 20, 1998, the Division meet with Kimberley Wolf and
Michael Gibson of your staff. Mr. Gibson and Ms. Wolf presented
further information regarding the snowmelt event that occurred on
March 23, 1998. The facts discussed regarding Outfall 007A were
that the volume of the pond at 8:00 a.m. the morning of the event
was at the bottom of the headgate. By 2:00 p.m. of March 23, 1998,
6 hours later, the water level had risen nearly 2 feet and was
spilling over the top of the riser pipe. Temperature charts were
provided showed a warming trend in the temperature over the course
of the day. The self-monitoring data for Outfall 007 you provided
on your Discharge Monitoring Report for first quarter 1998, for.
Settleable Solids was 0.08 mg/1, permit limits of 0.05 mg/1.
Colowyo Coal Company has shown that outfall 007 discharged within
48 hours of.the precipitation event and the condition of the pond
before the event could contain a 10-year/24-hour precipitation
event. Since the volume capacity for a 10-year/24-hour
precipitation event was exceeded for Outfall 007A, Coloywo Coal
Company qualifies for the greater than l0-year/24-hour
precipitation event, thus waiving Settleable Solids limits.
If you have any further questions regarding this mater, please
contact me at [phone].
~~ 1
S•i.ncerely,
(C rl~ enkey
Water Q lity Protection Section
WATER QUALITY CONTROL DIVISION
cc: Local Health Department
Jim Chibrillo, DE, WQCD
Dan Hernandez, DMG
Kimberley Wolf, Coloywo Coal Company
MS-3 File