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III IIIIIIIIIIIII III <br />STATE OF COLORrti~v <br />Roy Romer, Governor <br />Patti Shwayder, Fxectrtive DireROr <br />Dedicated to protecting and improving the health and environment olthe people of Colorado <br />4300 Cherry Creek Dr. S. <br />Denver, Colorado 80746-1530 <br />Phone (3031 692-2 000 <br />Located in Glendale, Colorado <br />ht(p:(/wwtv.cdphe.state.co.us <br />October 21.1997 <br />Karl Koehler <br />Trapper Mining,lnc. <br />P.O. Box 187 <br />Craig, Colorado 81626 <br />Laboratory and Radiatlon Services Division <br />8100 Lowry Blvd. <br />Denver CO 80220-6928 <br />170}I 692-3090 <br />RECEIVED <br />n~? 2 3 <br />D1V.OF MINERALS <br />8 GEOLOGY <br />RE: Request for Alternate Limits due to Rain Events <br />For Ouffalls 002A, 011A and 017A <br />CDPS Permit No. CO-0032115, Moffat County <br />Dear Mr. Koehler, <br />pF [O <br />tib <br />~~ <br />~~e <br />~rD 16" <br />COlOfidO Devuab <br />This is in response to your letters dated July 16 and October 16, 1998, in which you reported a noncompliance with <br />eftfuent IimRs due to rain events at Outfalls 002, 011, 017 during March and May 1998. Your letters described the <br />condition of the ponds prior to the rain events and attached were temperature charts that indicated rainfall prior to the <br />sampling events. On March 30 and 31, 1998 approximately 0.53 inches of precipitation was recorded and on May 6, <br />1998 approximately 0.03 inches of precipitation was recorded at Trapper. Your sediment ponds are designed to Veat <br />and contain a 10-year24-hour precipitation event. Due to the time of year and prior snowmett events, the outfalls <br />referenced above were determined to have exceeded the "60°.6 full" clean out threshold for 1998. The self-monRortng <br />data you provided on your Discharge Monitoring Report is shown below: <br />Reported Permit <br />Period Outfall Parameter Resulfs Conditions <br />2098 002A TSS (mg/I) 40 (30 day avg) 35 (30 day avg) <br />2098 011A TSS (mg/I) 46 (30 day avg) 35 (30 day avg) <br />2098 017A TSS (mg/I) 96 (30 day avg) 35 (30 day avg) <br />2098 017A TSS (mgA) 96 (daily mx) 70 (daily mx) <br />2098 017A Iron, Total (mg/I) 5.0 (30 day avg) 3.0 (30 day avg) <br />Trapper Mining has shown that discharge occurred within 48 hours after measurable precipitation and that discharge <br />from the various outtalls was beyond your control. Therefore, we believe that Trapper Mining Company qualifies for <br />the less than or equal to a 10-year24-hour precipitation alternate limit, thus waiving TSS and Total Iron limits. <br />If you have any further questions regarding this matter, please contact me at (303) 692-3603 <br />Si ce ly, <br />Car a J. Lenkey <br />Water Quality P tection Section <br />WATER OUALI CONTROL DIVISION <br />cc: Local Health Department <br />Jim Chibrilo, D. E., W~GD <br />Tom Kaldenbach, DMG <br />MS-3 File <br />