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'~ <br />~OLOV~lYO COAL COMPANY L. P. <br />5731 S to Highway 13 <br />Nee lorado 81641 <br />9% 531 <br />'97~, , a-1598 FAX <br />NOLF ~NNECOTT COM <br />Kimberley A. Wolf <br />Environmental Engineer <br />October 19, 1998 <br />//s Kennecott <br />~ .Energy <br />Caloavyo CoafCumparu~L,P, '~c; <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 />RE: COLOtiVYO COAL COitiIPANY L.P. {COLOWYO); PERi~IIT YO. COG850017 <br />THIRD QUARTER 1998 DivIIt <br />.Dear Nls. 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, OOSA, OlOA. The self-monitoring <br />data provided on the enclosed DIvIRs indicate levels above specific discharge permit conditions <br />as indicated and discussed in this letter. <br />OutfaIl Regorted Permit <br />Number ete ate u t Conditions <br />~ ,D <br />002A pH, s.u. 7/27/98 ~~'(max) 6.5 min - 9.0 max <br />OIOA TSS, mg/1 7127/98 61 (30 day avg) 35 (30 day avg) <br />008A TSS, mg/1 8/11/98 80 (30 day avg) 3~ (30 day avg) <br />80 (daily max) 70 (daily max) <br />OO~A pH, s.u. 8/19/98 10.0 (max) 6.5 min - 9.0 max <br />pH, s.u. 8/Z~/98 9.4 (min) 6.~ 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 />