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COLOWYO COAL COMPANY L. P. <br />5 T31 State Highway 13 <br />Meeker, Colorado 61641 <br />(970) 624-1531 <br />(970) 624-1596 FAX <br />WOLFK@KENNECOTT.COM <br />Kimberley A. Wolf <br />Environmental Engineer <br />October 19, 1998 <br />RECEIVED <br />OCT 2 0 1998 <br />DIV. <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, CO. 80222-1530 <br />III IIIIII~IIIIII III r: <br />//~ Kennecott <br />~ . Energy,_~ , <br />ColomyoCOalCompan~L.P. ` <br />RE: COLOWYO COAL COMPANY L.P. (COLOWI'O); PERMIT NO. COG-850017 <br />THH2D QUARTER 1998 DMR <br />Dear Ms. Lenkey, <br />Colowyo is submitting the Third Quarter 1998 Discharge Monitoring Report to the Colorado <br />Department of Public Health and Environment, Water Qualiry Control Division. Discharges <br />occurred at Outfalls OOIA, 002A, 003A, 004A, OOSA, 007A, 008A, OlOA. The self-monitoring <br />data provided on the enclosed DMlts~indicate levels above specific discharge permit conditions <br />as indicated and discussed in this letter. <br />Outfall Reported Permit <br />u r Parameter Date Re ul Conditions <br />002A pH, s.u. 7/27/98 9.2 (max) 6.5 min - 9.0 max <br />OlOA TSS, mg/1 7/27/98 61 (30 day avg) 35 (30 day avg) <br />008A TSS, mg/l 8/11/98 80 (30 day avg) 35 (30 day avg) <br /> 80 (daily max) 70 (daily max) <br />OOSA pH, s.u. 8/19/98 10.0 (max) 6.5 min - 9.0 max <br /> pH, s.u. 8/25/98 9.4 (min) 6.5 min - 9.0 max <br />The sediment control pond associated with outfall 002A has received some inflow since the <br />beginning of the quarter. Outfall 002A discharged on July 27, 1998 and had a laboratory pH of <br />9.2 and a field pH of 9.0. The last laboratory analysis of the pH occurred on June 18 and was 8.6 <br />while the field pH measured 9.0. The elevated pH can be attributed to two factors, none of which <br />J <br />