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..,__ :~ <br />~. ... <br />s, <br />~II ~I~II~~I~~~~~~I~ <br />STATE OF COLORADO <br />Bill Owens, Governor <br />Jane E. Nonon, Executive Director <br />Dedicated to protecting and improving the health and environment o/the people of Colorado <br />4300 Cherry Creek Dr. 5. <br />Denver, Colorado 80246-1530 <br />Phone (303) 692-2000 <br />TDD Line (303) 691-7700 <br />Located in Glendale, Colorado <br />h ttp://www. cdphe. sta te. co. us <br />October 9, 2001 <br />Laboratory and Radiation Services Division <br />8100 Lowry Blvd. <br />Denver, Colorado 80230-6928 <br />(303) 692-7090 <br />Kimberley A. Wolf <br />Colowyo Coal Company, L.P. <br />5731 State Highway 13 <br />Meeker. Colorado 81641 <br />RE: Request for Alternate Limits <br />CDPS Permit No. CO-0045161, Outfalls OOIA, OOSA, 006A <br />Moffat County, Colorado <br />Dear Ms. Wolf: <br />~'c <br />ACT Ccc~~FO <br />I <br />''°°~M,~,~ ~0~ <br />s~G <br />pF CptO <br />y~~ <br />0 <br />~ o ~ <br />~O~ <br />~ ta76 <br />Colorado Departrnent <br />oFPubGcHealth <br />and Environment <br />This letter is response to your letter dated April 6, 2001, in which you reported noncompliance of effluent limits at <br />Outfalls OOIA, OOSA, 006A due to increasing temperatures on February 21 and March 5, 2001, respectively. <br />Provided with your letter was a table indicating daily high and low temperatures taken at Colowyo Coal <br />Company, L.P. ("Colowyo") which is recorded at an elevation of 7,200 feet. The increased temperatures resulted <br />in a discharge on February 21, 2001 at Outfalls OOSAand 006A and on March 5, 2001 at Outfall OOlA in which <br />Total Suspended Solid ("TSS") and Total Iron ("Iron") limits were exceeded. Coloywo is requesting alternates <br />limits for an event that qualifies for less than or equal to a 10 year/24 hour event, thus exempting it from only TSS <br />and Iron limitations. The self monitoring data you provided on your Discharge Monitoring Report is shown <br />below: <br />Outfall <br />Number Parameter <br />Reported <br />Results <br />Permit <br />Conditions <br />OOlA TSS, (mg/l) 100 (30 day avg) 35 (30 day avg) <br />OOlA TSS, (mg/1) 100 (daily mx) 70 (daily mx) <br />OOIA Iron, Total (mg/1) 4.99 (30 day avg) 3.5 (30 day avg) <br />OOSA TSS, (mg/1) 120 (30 day avg) 35 (30 day avg) <br />OOSA TSS, (mg/1) 120 (daily mx) 70 (daily mx) <br />OOSA Iron, Total (mg/l) 4.47 (30 day avg) 3.5 (30 day avg) <br />006A TSS, (mg/1) 710 (30 day avg) 35 (30 day avg) <br />006A TSS, (mg/I) 710 (daily mx) 70 (daily mx) <br />006A Iron, Total (mg/1) 12.5 (30 day avg) 3.5 (30 day avg) <br />Colowyo has shown that each of the described discharges occurred within 48 hours after measurable precipitation, <br />the discharges were beyond your control, and that the pond volumes prior to the precipitations event was <br />available. Therefore, the Division believes that Colowyo qualifies for the alternate limitations provision for <br />Outfalls OOIA, OOSA, and 006A for [he alternate limitations under the storm water exemption for TSS and Iron. <br />