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III IIIIIIIIIIIII111- <br />999 <br />STATE OF COLORADO <br />Roy Romer, Covemor <br />Patti Shwryder, Executive Director <br />LL°dicated to protecting and improving the health and environment o! the peopk o! Colorado <br />4300 Cherry Creek Dr. S. Laboratoy and Radiation Services Division <br />Denver, Colorado 802461530 8100 Lowy BHd. <br />Phone 1703) 692-2000 Denver CO 802246928 <br />L«ated in Glendale, Colorado (303) 692.3090 <br />http://www.cdphestate.co.us <br />January 22, 1998 <br />John M. Walters <br />Grand Valley Coal Company <br />P.O. Box 70 <br />Loma, Colorado 80222-1530 <br />RE: Storm Water Exemption, Third Quarter 1997 <br />CDPS Permit No.: CO-0038342, Outfall 001A <br />Dear Mr. Walters: <br />tiv OQ <br />„~~ <br />• reva <br />COIOrJAO Depift7Otnt <br />of Public Hnlth <br />RECEIVED '~d~'"'°"°"t` <br />FEB 02 1998 <br />Division of Minerals & Geology <br />This letter is in response to your letters dater October 28, 1997 and January 5, 1998 in which you <br />provided information regarding the reported noncompliance of effluent limits due to a rain event that <br />occurred from September 18 - 22, 1997. Your letter provided a precipitation log from September 18 - <br />22, 1997. Recorded rainfall for September 21, 1997 alone showed an accumulation of 2.5 inches of <br />rain qualifying the storm event as greater than a 10-year/24hour event, therefore, waiving Total <br />Suspended Solids. The self-monitoring data on your third quarter Discharge Monitoring Report that <br />qualifies for the storm water exemption is shown below: <br />Outfall <br />Number Parameter <br />Reported <br />Results <br />Permit <br />Conditions <br />001A TSS (mg/I) <br />001A TSS (mg/I) <br />150 (30 day avg) <br />150 (mx 7 day avg) <br />35 (30 day avg) <br />70 (mx 7 day avg) <br />Grand Valley Coal Company has shown that discharge occurred within 48 hours after measurable <br />precipitation, discharge was beyond your control, and that the pond volumes before the stone event <br />was at 60% capacity. The pond capacity before the stone event was capable of holding a 10-year/24 <br />hour stone event. We believe that Grand Valley Coal Company qualifies for the Stone Water <br />Exemption, therefore, waiving TSS limits for this discharge only. <br />If you have any further questions regarding this matter, please contact me at (303) 692-3603. <br />Siffce , IY, <br />11/aria J. Leek y <br />Water Quali ' ontrol Section <br />WATER QUA ITY CONTROL DI ISION <br />CC: Garfield Counly Health Department <br />Duane Watson, D.E., W~CD <br />Dan Hernandez, DMG <br />MS-3 File <br />