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+y~~ ~--- ~ - ~• LE SPY C c,rpRUs 'tr~ Yampa Valley July 25, 1991 Ms. Anne Ihlenfeldt Colorado Department of Health Attention: Permits and Enforcement Water Quality Control Division 4210 East 11th Avenue Denver, CO 80220 Dear Ms. Ihlenfeldt: i Cypnn Yampa Valley Coal Corporatbn 29587 Routt County RoaG M27 Oak Creek, Cokxado 80467 303879800 • DiSCharee MonitortinE Report for NPDF.S Permit CO-0042161. Fish Creek Borehole Enclosed please find the Discharge Monitoring Report for the SECOND QUARTER of 1991 for the above-referenced permit. Please note that an exceedence for TR Iron was recorded, as the Department had been informed by phone earlier. Per my conversation with Ms. Nelson on 24 July, those values for TSS and TR Iron normally based on the average of one sample/month aze based only on results from April and May, as the sample collected 25 June was somehow lost. Due to the pumping system, another sample could not be collected until 1 July, the analysis for which has been enclosed. TCC feels that this sample is representative of effluent quality during the month of June, given the short time between collection of the lost sample and collection of the sample 1 July. Attempts were made to collet a sample 29 June and 30 June, but the pumps did not activate until the early morning of 1 July. TCC apologizes for this oversight, and steps have been taken to prevent recurrence. Also discussed with Ms. Nelson was the current status of the Pilot-test plant design proposal responses solicited by TCC. As discussed previously, TCC solicited proposals in mid-June, but received no response due to the requested tie frame. After contacting the Department to such effect, TCC again solicited proposals in early July, with final responses received 15 July. Due to the conjunction of greater than expected time frames requirements and the number of questions left unanswered by the proposals, TCC wishes to have a second treatability study conducted in order to identity the most efficient and cost effective treatment option. The time frame of this study would be 1/4 to 1/3 of that required to perform the pilot plant testa nd the results are projected to address more options than possible with a pilot facility. It is anticipated that the treatability study could be completed by mid-October and would provide the information necessary to discuss a subsequent course of action with the Department.