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<br />J~O <br />~~ <br />Q~G 'L~~~1 as°°, <br />OC.` ~ °~ ~a~0~ <br />September 27, 2007 <br />Ms. Tania 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 />Phone: (303) 692-3603 <br />RE: PERMIT CO-0036684: August 2007 DMR SUBMITTAL <br />Dear Ms. Watson: <br />~oo~ <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 8793800 <br />Please find enclosed the above referenced discharge monitodng reports for the month of August 2007. Outfalis OOtA and <br />MON 1 (same site No. 62) flowed each week of the period. No permit limitation exceedences were noted dudng the quarter. <br />Quartedy W hole Effluent Toxicity (WET) testing for 001 W was conducted at this site on August 07,2007. Note that acute W ET <br />testing for two species was inadvertently conducted using the requirements of the old permit before we realized the new permit <br />required quarterly 2 species chronic testing. Chronic testing was conducted the week of September 17~, and will be included <br />with the September DMRs. In the interim we've included the acute test results from August for your records. Results indicate <br />that the effluent was not acutely toxic to fathead minnow or Ceriodaphnia dubia. Copies of laboratory test results are attached. <br />Please con/tayc~t me directly at (970) 870-2750 for any further questions or additional information. <br />- ~. i// <br />Brian A. Watterson, R.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company, <br />Enclosures <br />cc: D G <br />PS Permit No. CO-0036684 file <br />