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III IIIIIIIiilllllli <br />999 <br />RECEIVED <br />OCT 2:) 1999 <br />C~wsion of Minerah~ & Geology <br />October 28, 1999 <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division - Perrrtits and Enforcement <br />4300 Cherry Creek Dme South <br />Denver, CO 802?2-1530 <br />~~0 <br />Twentymlle Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, CO 80467 <br />(970) 879-3800 <br />RE: PERMIT CO-0036684: THIRD QUARTER 1999 DMR SUBMITTA7 <br />Dear Ms. Lenkey: <br />Please fmd enc]osed the above referenced dischazge monitoring reports for the period from July 1, 1999 through <br />September 30, 1999. No permit limitation exceedences occurred during the perod. <br />Quarterly Whole Effluent Toxicity (WET) tests were conducted for Outfall 001 the week of August 30, 1999. <br />This site posed for both species, with "Concentrationswith Statistically Significant Difference in Lethality" reported <br />at > 100% for P. Promelas and >100% for C. Dubia. Copies of the CDPS \X/ET Test Report Forms for both species are include <br />this submittal. <br />Outfall 001 is being tested for Hardness in addition to the required pazametea. A copy of those results is included N this submin <br />Please contact me a[ (970) 870-2730 for any further questions or additional information. <br />Twentymile Co~a'(lf~Copm,,,p~an,~y~(~~ <br />Joe oemaker <br />Environmental Specialist <br />enclosures <br />cc: DMG <br />CWl'S Permit No. CO-0036684 fde <br />