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III IIIIIIIIIIIII III <br />STATE OF COLC~iv~~ <br />Roy Romer, Governor <br />Patti Shwayder, Executive Director <br />Dedicated to protecting and improving the health and environment o(the people o/Colorado <br />4300 Cherry' Creek Dr. S. Laboratory and Radiation Services Division <br />Denver, Colorado 80246-1530 8100 Lowry Blvd. <br />Phone (3071 692-2000 Denver CO 80220.6928 <br />Located in Glendale, Colorado I30]1692J090 <br /> <br />RECEIVED <br />http://wsvw.cdphe sute.co. us <br />September 30, 1998 ~~T 2 1998 <br />James A. Kiger <br />OF MINERALS <br />Colo o Coal Com an <br />F'Y P Y DIV. <br />g GEOLOGY <br />5731 State Highway 13 <br />Meeker, Colorado 81641 <br />RE: Request for Alternate Limits Due to Snowmelt <br />CDPS Permit- No.:--COG-850017;- Outfall-007A -- <br />Koffat County <br />Dear Mr. Kiger: <br />F'~ <br />ti~ <br />w~~ \~ <br />~ rta76 ~ <br />rlorado Department <br />of Public Health <br />and Fnvtronment <br />This letter is in response to your letter dated September 18, 1998, <br />in which you provided further additional information regarding a <br />snowmelt event that occurred during the week of March 23, 1998. In <br />your letter, you claimed: 1) that the water level in the pond, <br />Outfall 007A, was more than two (2) feet below the top of the riser <br />pipe at 8:00 a.m. on March 23, 1998; 2) By 2:00 p.m. on that same <br />day, only six hours later, the pond had risen more than two (2) <br />feet and was spilling over the top of the riser pipe; and 3) At <br />that time, a sample was taken. Flow for this event .was reported on <br />your Discharge Monitoring Report (DMR) as 0.265 MGD which is <br />equivalent to 0.41 cubic feet per second(cfs). The predicted peak <br />discharge from the primary spillway riser during a 10-year/24-hour <br />precipitation event is 1.30 cfs. The question that arises here is <br />that if this event qualifies as a greater than 10-year/24-hour <br />precipitation event, then why is there such a discrepancy between <br />the predicted flow and the reported flow during the event? The <br />Division is requesting that you provide information which explains <br />this discrepancy befcre we can agree that this event qualifies as a <br />greater than 10-year/24-hour precipitation event. <br />Please contact me if you have any questions at (303) 692-3603. <br />n rely, <br />arla J. nk y <br />Complian Assurance/ orcement Specialist <br />Water Qua ity Protection Section <br />WATER QUALITY CONTROL DIVISION <br />cc: Byron G. Walker, DMG <br />Jim Chibrilo, DE, WQCD <br />MS-3 File <br />