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<br />)UN 2~ 2002 <br />Division of Mine~a\s and Geo1o9Y <br />©~© ,~'c <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970)879-3800 <br />June 24, 2002 <br />Ms. Tanya Watson <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />RE: PERMIT CO-0027154: REVISION of 1st QUARTER & March 2002 DMR SUBMITTAL <br />Dear Ms. Watson: <br />As a result of your letter dated June 13, 2002, it has come to my attention that DMR forms for Outfall 001 W and 005W (Wet <br />testing) were inadvertently omitted from our submittal the first Quarter 2002 DMRs. Copies are attached. Below is the text on <br />the WET testing from our Apri126, 2002 DMR cover letter. Note that the April 26 letter erroneously reported an initial WET test <br />acute toxicity in January 2002. This has been corrected below to February 2002. <br />A Quarterly Whole Effluent Toxicity (WET) test was conducted for Outfall 001 in February 2002. This test indicated that the <br />effluent was acutely toxic to Daphnia magna survival. Accelerated WET testing was subsequently conducted in February and <br />March. Two consecutive accelerated tests were determined to be acutely toxic to Daphnia magna survival. As a result, PTI <br />testing will be performed within the second quarter of 2002. Note that the preprinted DMR indicates acomposite-3 sample <br />type, however this acute WET test only requires a single grab sample. <br />A Quarterly Whole Effluent Toxicity (WET) test was conducted in February, 2002 for Outfall 005. This test indicated that the <br />effluent was not acutely toxic to Daphnia magna survival, therefore Outfall 005 is in compliance. Note that the preprinted DMR <br />indicates acomposite-3 sample type, however this acute WET test only requires a single grab sample. <br />I apologize for the oversight. Please contact me directly at (970) 870-2750 for any questions. <br />Brian A. Watterson, <br />Environmental Geologist, <br />Twentymile Coal Company <br />cc: DMG <br />CWPS Permit No. CO-0027154 file <br />