HYDRO24261

• Permit No: C1982056
• IBM Index Class Name: Hydrology
• Doc Date: 6/10/1996
• Doc Name: CHEMICAL USAGE CYPRUSL YAMPA VALLEY COAL CO CDPS CO-027154 & TWENTYMILE COAL CO CDPS CO-0042161
• From: WQCD
• To: CYPRUS YAMPA VALLEY COAL CO
• Permit Index Doc Type: CORRESPONDENCE
• Media Type: D
• Archive: No

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999 STATE OF COLORADO
Roy Romer, Governor
Patli Shwayder, Acting Executive Director
Dedicated to protecting and improving the health and environment of the people o! Colorado
4700 Cherry Creek Dr. 5. Laboratory Building ~~~F i (~ r
Denver, Colorado 80222-1530 4210 E. 11th Avenue
Phone [phone] Denver, Colorado 80220-3716 ,~~~N '~ (~, ); ii ll
[phone]
Water Quality Control Division
WQCD-PE-B2 pivicmr. ~.; ;. ~...-.... .
(303)+692-3500 FAX (303)+782-0390
June 6, 1996
Tavis D. Rogers
Environmental Specialist
Cyprus Yampa Valley Coal Company
29587 Routt County Road 1127
Oak Creek, CO 80467
RE: Chemical Usage
Cyprus Yampa Valley Coal Co., CDPS No. CO-0027154 and
Twentymile Coal Co., CDPS No. CO-0042161
Rotrtt County
Dear Mr. Rogers:
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Colorado Department
of Public Health
and Fslvironment
We have reviewed your request to use CUTRINE-PLUS for algae control in waters discharged or potentially
dischazged at Outfall 001, CYVCC, CO-0027154 and Outfall 002, TCC, CO--0042161.
Your letter states that you do not expect to exceed the daily maximum limitation (or CO-0027154-0O1 of
0.130 mg/P while using this chemical. However, the manufacturer's literature states that an application rate
of 0.2 ppm (mg/P) is required for surface spray/injection and 1.0 ppm is required for drip systems. If such
concentrations carry over to the outfall, the limitation would be exceeded. We are concerned that existing
levels of capper in the water could add to any copper concentration from the chemical and cause exccedences;
also a high one-time copper concentration due to the chemical use could cause exceedence of the 30-day
average limitation of 0.073 mg/P. Any exceedences could be subject to enforcement action. We do not want
to encourage any activity that might result in permit violations. On the other hand, we do not want to
prevent a solution to the algae problem. Therefore, we fold CUTRINE-PLUS acceptable for short-term use
as requested in your letter providing effluent limitations aze met.
We request that you mottitorfor potentially dissolved (PD) copper as soon as you expect effluent containing
this chemical to be dischazged through CO-0027154-001. Routine monitoring would continue as required
under that permit. Additionally, we request that if dischazge occurs from CO-0042161-002 after application
of this chemical that you immediately monitor for PD copper on a minimum of once per week while the
chemical is being dischazged. !n order to determine appropriate effluent concentrations for the Twentymile
permit, compaze effluent concentrations at CO-0042161-002 to the calculated potential limitations of
0.05810.071 mg/P as shown on page 8 of the rationale dated September 30, 1994. If levels exceed these
limitations or any instream impacts aze observed, use of CUTRINE-PLUS shall stop immediately and water
containing the chemical shall be contained to the extent possible. If exceedences occur, you will need to
notify me at [phone] or Kathleen Sullivan at [phone].