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~ 'rV116N7'YMIL6 <br />sra COAL. COMPANY <br />A Cyprus Amax Company <br />Apn128, 1999 <br />ii< <iiiii~~~ii» iii <br />Ms. Carla Lenkey <br />Colorado Deparnnent of Public Health and Environment <br />Water Quality Con[ro! Division - Pennit~ and Enforcement <br />4300 Cherry Creek Dme South <br />Denver, CO 80222-1530 <br />RE: PERMIT CO-003GGR4: FIRSTOl1ARTER 1999 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />Twentymile Coal Company <br />29515 Routt County Road N27 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />RECEIVED <br />APR 2 91999 <br />Division of Minerals 8 Geobgp <br />Please fmd enclosed the above referenced discharge monitorutg reports for the period from January 1, 1999 through <br />March 31, 1999. No penni[ lunilalion exceedences occurred during the period. <br />Quarterly Whole E((luent Tonicity (WE~ tests were conducted for Outfall 001 the week of March 15, 1999. <br />Tlus site posed for both species, wdth "Concentrations with Statistically Significant Difference N Lethality" rcpoAed <br />at 50% for P. Promelas and 100% for C. Dubin. Copies of dte CDPS WET Tes[ Report Fonns for both species are uuluded with <br />dIIS SUhINIIaI. <br />The WET tests conducted this quarter required extra visits to this site, thus pmducutg additional Geld parameter values which were <br />calaJaled vvo the smustics reporteJ on the DMRs. <br />OutGdl OCII is beuig tested for Hardness ut addition Ur die required parameters. A copy of [hose results is mduded m this submittal. <br />Please contact me at (97(C) 870-?730 for any further questions or additional utfortnation. <br />Twentymile Coal Cotnp:uty <br />~~~~ <br />Jo Shoemaker <br />EnvironmenW Spcciakst <br />enclosures <br />cc DMG <br />C\rgaS Permit No. CO-003GG84 fde <br />