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iii iii iiiiiniuiii <br /> <br />RECEIVED <br />~ ACT 1999 <br />~Di~~ ~ ~~tinerals & Geology <br />October 28, ] 999 <br />Ms. Carla Lenlcey <br />Colorado Deparuttent of Public Health and Environment <br />\Vater Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />~0~ <br />Twentymlle Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, CO 80467 <br />(970) 8793800 <br />RE: PERMIT CO-0042161: THIRD O ARTER 1999 DMR S igMITTAL <br />Dear Ms. Lenlcey: <br />Pleue find enclosed the above referenced discharge monitoring report for the period from July 1, 1999 through <br />September 3Q, 1999. No pem»t exceedences occurred during the quarter. <br />Quarterly Whole EfOuent Toxicity (WET) test were conducted on Outfall 001 the week September Sit, 1999. <br />This site posed for both species, with a "Concentration with Statisocally Signific:mt Difference m Lethahrr" <br />reported at 75.0% for C Dubia, and a concentration of 75% for P. Promelas. Copic. of the CDPS \K~I CI~ <br />Test Repot Fonns for both species aze included widt this submittal. <br />TCC continues to note that there is not a Total Dissolved Solids limit in the pens n. l~hc 3u-d;n~ limn ut <br />1700 mg/1 indicated on the DMR fomt is incorrect. No exceedence has occurred fur that parameter. <br />Please contact me at (970) 870-2730 for any further questions or additional in formation. <br />T\VENTYMILE COAL COMPANY <br />Joe Shoemaker <br />Environmental Specialist <br />enclosures <br />cr. DMG <br />C\VPS Permit No. CO-00421G1 file <br />