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y,~ TW6NTYM166 <br />~ COAI. COMPANY <br />A Cyprus Amax Company <br />April 28, 1998 <br />• iii iiiiiniiii~i iii <br />sss <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: l ERMIT CO.0042161: FIRST QUARTER 1998 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />RECEIVED <br />APR 2 9 1998 <br />Division of Minerals & Geology <br />Please find enclosed the above referenced discharge monitoring report for the period from January 1, 1998 through <br />March 31, 1998. One permit limitation exceedence is reported for this period. <br />Outfall 002 incurred one permit limitation exceedence for BODs % Removal with a calculated result of <50%. Site <br />3001 had an unusually low BODs of <30 on 3/5/98 which was the contributing factor to this exceedence. TCC has <br />tried to locate the probable cause of this anomaly, but has not found any concrete evidence to support this data. The <br />only logical explanation would be extreme dilution coming from the 'Boot \y/ash' which integrates into the influent <br />wastewater. TCC has received results for Outfal1002 for 4/1/98, which indicate that the parameter in question is <br />in the typical range associated with this site. <br />Outfa11002 does not have a reported value on 315198 for the fecal coliform due to analyst error at the laboratory. <br />Enclosed is a letter from the participitating laboratory which explains the cause for the error. Thus, Outfall 002 was <br />visited per permit regulations. <br />There is no discharge at Outfall 001 to enable chemical or toxicological testing to date. <br />Please contact me a[ (970) 879-3800, ext. 2805 for any further questions or additional information. <br />~-~ <br />TWENTYMI {tL COMPANY / <br />/ 1 <br />~~~~~~ <br />Stephanie S. Carter <br />Environmental Specialist <br />enclosures <br />• <br />Twentymile Coal Corporation <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />cc: DMG <br />CWPS Permit No. CO-0042161 file <br />