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<br />~i- iii~~iiiii~iiiii <br />Twentymile Coal Company <br />29515 Routl County Road A 27 <br />I Oak Creek, Colorado 80467 <br />~,~i~ (970)879-3800 <br />April 26, 2000 <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 />RECEIVED <br />RE: PERMIT CO-0036664: 1`~ QUARTER 2000 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />000 <br />MAY O1 2000 <br />Division of A4inetals 8 GeolcOy <br />Please find enclosed the above referenced discharge monitoring reports for the period from January 1, 2000 through March <br />31, 2000. No permit limitation exceedences occurred during the period. <br />Quarterly Whole Effluent Toxicity (WET) tests were conducted for Outfall 001 the week of March 15, 2000. This site passed <br />for both species, with "Concentrations with Statistically Significant Difference in Lethality" reported at 100% for P. Promelas <br />and >100% for C. Dubia. Copies of the CDPS W ET 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 DMRs. <br />Outtall 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 further questions or additional information. <br />Twen~tym~ile Coal C'o~J~mpa~n~y~ <br />Stephen L. Miller P.E. <br />Sr. Mining Engineer <br />enclosures <br />cc: ~1MG ~ <br />CW PS Permit No. CO-0036684 file <br />