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i 1 'II III'II'I~"II'll <br />999 ©© <br />March 7, 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 />RE: PFRMIT C'0-0042161: FOURTH QUARTFR 1999 DMR CLiBM(T'FAI <br />Dear Ms. Lenkey: <br />RECEIVED <br />MAR 0 q 2000 <br />Division of Minerals & Geology <br />Please find enclosed the above referenced discharge monitoring report for the period from October 1, 1999 through <br />December 31, 1999. One permit exceedence occurred during the quarter for % BOD Removal. <br />At Ou[fall 002 and Site 3001 an exceedence occurred on December 23rd when the % BOD Removal was 83.13%, below the <br />85% minimum limitation. TCC believes this exceedence waz a result of unusual conditions created during the holiday <br />season, due to lack of personnel on site. We have experienced no other problems with the % BOD Removal during this <br />reporting period. <br />Outfall 001 had no discharge for the second half of November and all of December, which lessened the number of field <br />parameter values calculated into the statistics reported on the DMRs. <br />Quarterly Whole Effluent Toxicity (WET) tests were scheduled for late November at Outfal] 001, but low flow conditions in <br />both Fish and Trout Creeks during mid-November prohibited our ability to discharge from the facility for the remainder <br />o{ the 4th quaver. So, although planned, the WET tests were not obtainable due to these extenuating circumstances. <br />The DMR for Permit CO-0042]61 is being subitted late, due to a lack of the proper documentation forms. But, az per <br />conversations with Carla Lenkey, Sandra McDonald, and Leslie Simpson, this submittal will be recognized as being timely and <br />no violation will be incurred. <br />Please con[act me at (970) 870-2785 for any further questions or additional information. <br />enclosures <br />cc: DMG <br />CWPS Permit No. CO-0042161 file <br />Twentymile Coal Company <br />29515 ROUTT COUNTY ROAD N27, OAK CREEK, CO 80467 Phone: (970) 879-3800 Fax: (970) 879-8050 <br />