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STATE OF COLOP~ADO <br />Bill Owens, Governor <br />N <br />i <br />D <br />Op Co2 <br />Jane E. <br />orton, Execut <br />ve <br />irector 0 <br />a4' ~ ~~ <br />P ~ <br />Dedicated to protecting and improving the health and environment of the people of Colorado ~s o <br />y <br />4300 Cherry Creek Dr. 5. Laboratory and Radiation Services Division ~ n~` <br />` <br />~ <br />Denver, Colorado 80246-1530 8100 Lowry Blvd. . ~g76 r <br />Phone (303) 692-2000 Denver, Colorado 80230-6928 <br />TDD Line (303) 691-7700 (303) 692-3090 Colorado Department <br />Located in Glendale, Colorado of PuE1(lCHealth <br />http//www.cdphestate.co.us and Environment <br /> RECEIVED <br />July 23, 2002 <br />l t r t L v 2~~2 <br />Kunberley A. Wolf <br />Colowyo Coal Company, L,P. <br />5731 State Highway 13 Oiuision of Minerals end Geology <br />Meeker, Colorado 81641 _ _ __ __ __ _ _ __ _ __ <br />RE: -Request for Alternate Limits due to a Snow Melt Event <br />For Outfa11004A <br />CDPS Permit No. CO-0045161, Mo[fat County <br />Dear Ms. Wolf, <br />This is in response to your letter dated Apri19, 2002, in which you reported a noncompliance with total suspended solids <br />(TSS) and total iron effluent limits due to snow melt at Outfa11004A on Apri123, 2001. Your letter described the pond as <br />being properly maintained and operational prior to the snowmelt. Temperature charts were included demonstrating a <br />fluctuation in temperature during the sampling event. Sampling was conducted on March 25, 2002 a[ approximately 9:00 <br />a.m. at Outfall 004A. A ten-year, 24-hour event at Coloywo Coal Company is approximately 1.40 inches. Your sediment <br />ponds are designed to contain a 10-year/24-hour precipitation event. The self-monitoring data you provided on your <br />Discharge Monitoring Report is shown below: <br />Reported Permit <br />Period Outfall Parameter Results Conditions <br />1Q02 004A TSS (mg/1) 62 (30 day avg) 35 (30 day avg) <br />1 Q02 004A TSS (mg/1) 62 (daily tux) 70 (daily tux) <br />1Q02 004A Iron, Total (mg/1) 12.3 (30 day avg) 3.5 (30 day avg) <br />1 Q02 004A Iron, Total (mg/1) 12.3 (daily tux) 7.0 (daily tux) <br />Colowyo Coal Company has demonstrated that discharge occurred within 48 hours after measurable snowmelt and that <br />discharge from Outfall 004A was beyond control. Therefore, we believe that Colowyo Coal Company quali£es for the less <br />than or equal to a 10-year/24-hour precipitation alternate limit, thus waiving total suspended solids and total iron. <br />If you have any further questions regarding this matter, please contact me at (303) 692-3603. <br />Sin/c~ely, <br />( ~~a \ /~ <br />(~C ~- <br />Carla J. Lenk y <br />Water Quality rotectionSection <br />WATER QUALITY CONTROL DIVISION <br />cc: Local Health Department <br />Jim Chibrilo, D.E., WQCD <br />'9~7tii~f'91H~If 63EH!BM1N ~ <br />MS-3 File <br />