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iii iiiniiiniu iii <br />January 24, 2000 <br />0~0 <br />Twentymfle.Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, CO 80467 <br />(970)879-3800 <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment ~C <br />Water Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />y/c <br />Denver, CO 80222-1530 uA7o ~ 3) J`O <br />RE: PERMIT CO-0036684: FOURTH QUARTER 1999 DMR SUBMITTAL ~~'SB~, <br />Dear Ms. Lenkey: ~y <br />Please find enclosed the above referenced discharge monitoring reports for the period Erom October 1, 1999 through <br />December 31, 1999. No permit limitation exceedences occurred during the period. <br />Quarterly Whole Effluent Toxici[y (WET) tests were conducted for Outfall 001 the week of November 15, 1999. <br />This sice passed for bo[h species, with "Concentrations with Statistically Significant Difference in Lethality" reported <br />at 50% for P. Promelas and 50% for C. Dubia. Copies of the CDPS WET Test Report Forms for both species <br />are included with this submittal. <br />Outfall 001 is being tested for Hardness in addition to the required parameters. A copy of those results is included in <br />this submittal. <br />Please contact me at (970) 870-2785 for any further questions or addi[ional information. <br />S. Catter <br />enclosures <br />cc: DMG <br />C\VPS Permit No. CO-0036684 file <br />