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iii iiiiiiiiiiiii~ii <br />C TWNNTYM166 <br />COAT. COMPANY <br />A Cyprus Amax Company <br />Twentymile Coal Company <br />29515 Routt County Road k27 <br />Oak Creek, Colorado 80467 <br />970-879-3800 <br />April 28, 1999 <br />Ms. Carla Lenkey <br />Colorado Departrnent of Public He:dth ;md Environment <br />\Y/ater Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />RE: PERMIT CO-00421G1• FIRST QUARTER 1999 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />Division of Minerals 6 Geology <br />RECEIVED <br />APR 2 91999 <br />Please find enclosed the above referenced discharge monitoring report for the period from Marchl, 1999 through <br />March 31, 1999. Two permit exceedences occurred during the yuarter. <br />At Outfall 002 an exceedence occurred on ~nnuary 14, 1999 when the maximum 7 day average for BOD was <br />found to be in excess of the 45 mg/I limitation. TCC believes this exceedence was a result of uuruual <br />Conditions created during the holiday season. While fewer than normal people were present, several <br />special de;ming and mainten:mce projects were undertaken. We have experienced no further problems <br />with the EiOD through this reporting period. <br />Quarterly \C/hole EfOuent Toxicity (WE'D test were conducted on Outfall 001 the week March ]S, 1999. <br />This site passed for C. Dubin, with a "Concentration with Statistically Signific;mt Difference in Lethality" <br />reported at 75.0%. The site failed, however, for P. Promelas with a "Concentration with Statistically <br />Significant Difference in Lethality" reported at 4Z0%. Copies of the CDPS \Y/ET Tes[ Report Fonns for <br />both species are included with this submittal. Accelerated \Y~ET testing began ar Apol l2, 1999. Results <br />of those tests are not yet available. <br />The WET tests conducted this yuarter required extra visits to Outfall 001, and generated additional field <br />parameter values which were calculated into the statistics reported on the DMR<. <br />TCC continues to note that there is not a Total Dissolved Solids limit in the permit. The 30-day limit of <br />1700 mg/1 indicated on the DMR form is incorrect. No exceedence has occurred for that paraeneter. <br />Please contact me at (970) 870-2730 for any hrrther questions or additional infonnarion. <br />T\CrENTYMILE COAL COMPANY' <br />~ ~ C'Q'>'~l ti ~-~/ <br />hoc Shoemaker <br />Hnvironmenml Specialist <br />enclosures <br />cc DMG <br />C\CPS Permit No. CO-0t1421G1 file <br />r <br />