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~~ ' Ge • iii iiiiiiiiiiiu iii ~Y Colorado Yampa Coal 29588 Rouft County Road #27, Oak Creek, CO 80467 • Telephone (303) 879-3800 Mr. Donald H. Simpson Colorado Department of Health Water Quality Control Division 4210 East 11th Avenue Denver, Colorado 80220 Dear Don: January 9, 1985 DECEIVED JAN 151985 GAINED LAND RECI.pMATIAN DIVISION Colo. Dept of Natural rtesuurues Re: Application for Permit Amendment; NPDES Permit CO-0027154 In response to your letter of November 6, 1984, Colorado Yampa Coal Com- pany (CYCC) hereby requests an amendment to Permit CO-0027154 to allow dis- charge from a spring on the mine property. CYCC did not receive your certi- fied letter until November 29, 1984, due to insufficient postage. Thus, we have not been able to reply to your letter until now. As described in a letter from CYCC to the WQCD dated October 26, 1984, a change in discharge has occurred at discharge point 007. The source of the discharge is a spring which currently flows into a treatment facility. CYCC proposes to divert the spring water around the treatment facility via a buried pipe. The spring is located in the SW of SE corner of Section 29, Township 5N, Range 86W. The source of the water feeding the spring is ground water from the backfilled spoils of the Area 1 Mine Pit. Ground water in the reclaimed mine pit is recharged by precipitation and snowmelt. Discharge from the spring was detected after the heavy runoff season in 1984, and first sampled on August 14, 1984. Alternative designs for handling the spring water were devised and submitted to the WQCD in the referenced letter dated October 26, 1984. The treatment facility currently being used to handle the spring dis- charge is Sedimentation Pond F, which was constructed in October of 1982. The pond was designed to contain and treat runoff resulting from a 10-year, 24- hour precipitation event. The spring did not exist at the time the pond was constructed, and thus was not accounted for in the original designs. CYCC has collected data and information on the spring to document the change in discharge. Estimates of the quantity of flow are derived from moni- toring data on the attached table. A sample was taken at the spring on Decem- ber 4, 1984 and analyzed for all of the parameters requested by the WQCD. Results are shown in the attached analysis. The quality of the spring water meets effluent limitations applicable to NPDES Permit CO-0027154 without addi- tional treatment.