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STATE OF COLORADO <br />Bill Owens, Governor <br />Jane E. Norton, Executive Director <br />Dedicated to protecting and improving the health and environment o(the people o(Colorado <br />4300 Cherry Creek Dr. 5. <br />Denver, Colorado 60246-1530 <br />Phone (303) 692-2000 <br />TDD Line (303) 691-7700 <br />Located in Glendale, Colorado <br />http:/iwww, cdphe.sta te.co. us <br />March 13, 2002 <br />Dennis Jones <br />Seneca Coal Company <br />Hayden, Colorado 81639 <br />REU~YG~UlED <br />pF' COQ <br />N4 <br />~~~ <br />s + <br />~ r876 ~ <br />Colorado Depargnent <br />of Pub&c Health <br />and Environment <br />____ MAR 1' ~ 2002 ~ X42 <br />RE: Request for Alternate Limits due to a Rain Event pivisi6nbt Minerals and Geology , •;o9y <br />For Outfall 012A <br />CDPS Permit No. CO-0000221, Routt County <br />Deaz Mr. Jones, <br />This is in response to your letter dated January 11, 2002, in which you reported a noncompliance with total suspended solids <br />effluent limits due to a rain event at Outfa11012A on October 11, 2001. Your subsequent letter dated Febmary 14, 2002, <br />described the pond as being properly maintained and operated prior to the rain event. Temperature charts were included <br />indicating that the sampling event occurred within 48 hours after the rain event. <br />The sampling event was conducted on October 11, 2001 at approximately 10:00 a.m. for Outfa11012A. At which time, <br />approximately 0.88 inches of precipitation was recorded on your temperature chart. A ten-year, 24-hour event at Seneca Coal <br />Mine is 1.40 inches. Your sediment ponds are designed to contain a 10-yeaz/24-hour precipitation event. The self- <br />monitoring data you provided on your Discharge Monitoring Report is shown below: <br />Reported <br />Period Outfall Pazameter <br />4Q01 012A TSS (mg/1) <br />Permit <br />Results Conditions <br />60 (30 day avg) 35 (30 day avg) <br />Seneca Coal Company has demonstrated that the discharge occurred within 48 hours after measurable precipitation and that <br />- discharge frortrthc6utfa1101-2r1-was-beyond conkvl~'herefore,-we beiieve$tat Seneca-Coat Company qualifres'for the less <br />than ore ual to a 10-year/24hour~recipitarion_ _alternatelimit.Shus waivingSotalsuspendedsolids. -~ - - - -- -- -~ ~ -- <br />If you have any further questions regazding this matter, please contact me at (303) 692-3603. <br />Sin erely, <br />J <br />Carla J. Lenkey <br />Compliance/En ement Specialist <br />WATER QUALITY CONTROL DIVISION <br />Laboratory and Radiation Services Division <br />6100 Lowry Blvd. <br />Denver, Colorado 80230-6928 <br />(303)692-3090 <br />cc: Local Health Departrnent <br />Jim Chibrilo, D.E., WQCD <br />Michael Boulay, DMG' <br />MS-3 Fite <br />