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III IIIIIIIIIIIII III <br />999 <br />January 25, 2001 <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />RE: PERMIT CO-0036684; 4th QUARTER 2000 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />JAN 3~ 2001 <br />division of Minerals 8 Geolor~~ <br />Please find enclosed the above referenced discharge monitoring reports for the period from October 1, 2000 through <br />December 31, 2000. No permit limitation exceedences occurred during this quaver. <br />Quarterly Whole Effluent Toxicity (WET) tests were conducted for Outfall 001, indicating no toxicity to P. Promelas or C. Dubia. <br />The "Concentration with Statistically Significant Difference in Lethality" was >100% for C. Dubia, and 75% for P. Promelas. <br />Copies of the CDPS WET Test Report Forms for both species are included with this submittal. <br />The WET tests conducted this quarter required extra visits to this site, thus producing additional field parameter values which <br />were calculated into the statistics reported on the DMR. <br />Outfall 001 is being tested for Hardness in addition to the required parameters. A copy of those results is included in this <br />submittal. <br />Please contact meat (970) 870-2750 for any fuvher questions or additional information <br />Twen mile Coal Company,' <br />Stephen L. Miller ~%~~ <br />Sr. Mining Engineer <br />enclosures <br />000 <br />Twentvmile Coal Comoan <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970)879-3800 <br />RECEIVED <br />cc: DMG <br />CWPS Permit No. CO-0036684 file <br />