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iiiiiuiiiiiiiiiiii <br />COLORADO YAMPA Colorado Yampa Coal Company <br />~~ COAL COMPANY 29515 Routt County Road #27 <br />~? Oak Creek, Colorado 80467 <br />A Cyprus Amax Company (970) 879-3800 <br />January 27, 1999 <br />Ms. Carla Lenkey RECEIVED <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division - Permiu and Enforcemen[ JqN 2 g 1999 <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 Division of Minerals & Geology <br />RE: P MiT .0-0027154: D MR R 199R D R S MITTAI. <br />Dear Ms. Lenkey: <br />Please Cmd enclosed the above referenced discharge monitoring report for the period from December 1, 1998 through <br />December 31, 1998. Three permit limitation exceedences are reported for fourth quarter. <br />Quarterly Whole Effluent Toxicity (WET) tests were performed on Outfalls 001 and 005 the week of Ottober 19, 1998 <br />for both C. dubs and P. promelas. Outfall OOlpazsed Eor C Dubin with "Concentrations with Statistically Significant <br />Difference in Lethality" reported at > 100%, while Outfall 005 Failed at 100%. Both Outfalls failed for P Promelas <br />with "Concentrations with Statistically Significant Difference in Lethality" repotted ac 50% for Outfall 001 and 75°b for <br />Outfa11005. Copies of the CDPS WET Test Report Forms for both species are included in the submittal. <br />Accelerated testing waz not initiated for these failures due to our investigative study that is currently being conducted. <br />This matter haz been previously arranged between TCC and CDOH. <br />Outfalls 002, 004, 006, 007, 008, 009, 010, 016 and 017 did not discharge during this period. Outfal1020 hu not been <br />construtted yet; therefore, there is no discharge to enable chemical or toxicological testing to date. <br />Ou[falls 001, 005, and 007 are being tested for Hardness in addition to the required parameters. TCC is condutting <br />some internal sampling co Further explain some issues that have previously been in question with the NPDES <br />requirements. A copy of these results is included in the submittal. <br />Please contact me at (970) 870-2730 Eor any further questions or additional information. <br />COLORADO YAMPA COAL COMPANY <br />Joe Shoemaker <br />Environmental Specialist <br />enclosures <br />cr DMG <br />CWPS Permit No. CO-0027154 file <br />