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000 <br />Twentyrnile Coal Company <br />29515 Rouit County Road p 27 <br />Oak Crook, Colorado 80487 <br />(970) 879.3800 <br />RECFrvt <br />Juty 25, 2002 <br />JUL 2 g 2002 <br />Ms. Cade Lenkoy ~t~KVrcl1,!,;~,;~~3Gr~ <br />Colorado Departmen! of Public Health and Environment <br />Water Ouallty Control Divisbn • Permits and Enforcement <br />4300 Chorry Creek Drive South <br />Denvor, CO 80222•t530 <br />RE: FF RMIT CO.0042161; 2ND QUARTER 2Q02 DMR SUBMITTAL <br />Dear Ms.Lenkey <br />Pleaso ttnd enclosed the above referenced discharge monltonng reports for the poriotl from April t, 2002 through Juno 30. <br />2002. Noto that Outlall 001 d~schargod during each wuek In the po riod. No permit IimiWtion excursions occurred Uunng Iho <br />poriod for Oudall 001 One excursion was noted for Outfall 002 (Site 300E). During the woek of May 6, a pH reading of 9.17 <br />was moasured (above the permit limit of 9.0). The smglo elevated reading appears to havo been related t0 algae growth in the <br />wasto water lagoons. Subsequent use of an algaecide, and tho development of a surface duckweed cover, reduced algao <br />growth. All subsequent pH roadings in the period were below 9.0. <br />EPouenl from Outfall 002 mores with spoil water and eventually makes its way lnlo subsurface mine walor. Sonw of We <br />subsurlacrt mine water Is discharged penodically at Outlall 001. Based upon the strort duraUOn/limited volume of the elevated <br />pH episodo, end the dtlution factor Ot mixing with subsurface mine wafer, TCC is of the oplnl0n that n0 significant <br />environmental impact occurretl during the second quarter of 2002. <br />A Ouarlerly Whole Efiluont Toxidty (WET) conducted in Apnl indicated that the effluent was not acutely toxic to P. Prometas or <br />C. Dubla. Copids of tho CDPS WET Test Report Forms aro attached. <br />Ploase contact me daeeUy at (970) 870.2750 for any tuMer questions or additbnal InlOrmaUOn <br />,S~ ray/~ <br />Brian Watterson <br />Environmental Ge01og151 <br />Twentymile Coal Company <br />Encbsures <br />cc: DMG <br />CWPS Pormlt No. CO.0036684 file <br />