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Har 25 19 02:S1p III IIIIIIIII'III'll <br />sss <br />C TW6N7'YMIL6 <br />~ COAL COMPANY <br />A Cyprus Amaz Company <br />March 22, 1999 <br />Company (9701 870-2761 <br />Twentymile Coal Company <br />2951 S Routt County Road q27 <br />Oak Creck,Colorado 80467 <br />970-879-3800 <br />Carla Latkey <br />Colorado Deparunent of Public Health and Environment <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80222-1530 <br />RE: PERMIT CO-0042161; UPSET CONDITION NOTIFICATION: OUTFACE Ottl <br />Dear Ms. Lenkey: <br />Your o1Hce war notified on March 17, 1999, via voice omit, drat an unanticipated upxt condition had <br />occurtcd on that date regarding Outfall 001 of the above rc[erettced pemtit. 1 submit this letter as tlx written <br />report of that incident. <br />f trod checked Ute site of Outfall 001 at approxitttatcly 5:00 p.tn. on Marclt 16°i and all operatioru appeared <br />ttortnal. On tltc morning of the 17's 1 again vtsiled dtt site to collect water sample for Wet testing Uta[ was <br />iu progress. At dust time S noted in my field notes that (low Crow the discharge point was somewhat lower <br />[Iran nonnal. Anticipating that there might be art electrical problem tvitlt the pump I also noted dte <br />amperage meter reading. 1 retunted [o the office and notified our electrical department of my obxrvations <br />and asked Wan to investigate. <br />Rick Mills accompanied the back to Outfall 001 to continue our own investigation. We soon discovered <br />water running out the top of We SouW Pump manhole into a containment area and seepage Gom under We <br />toe of the containment area's embankment that could find its way to Fish Creek. We immediately shut off <br />the pump, thereby stopping additional flow (1:15 p.ttt.) to the containment area. We also collected a sample <br />of the untreated water in the containment and sent it io the lab for analysis. <br />The source of We upxt condition was found to be a failed compression tilting in the influent line Causing a <br />leak, which was repaired. S have calculated that flow from the leak was at a maximum rate of approzima[ely <br />150 g.p.tn. at [trot time. The leak to the tnanltolc and Wen to Ute containment occurred for no more dtan a <br />twenty hour period, though 1 have no way of determining au average Flow during We actual time. The water <br />did not ever overflow the embankment, but eeepage from uudcr the toe of We embankment was observed at <br />several locations. Very little erosion occurred during tltc event, and the embankment around the site <br />retained the water for a period of time. <br />Analysis of the water simples wi1V be forwarded to you, as they become available If you rcquirc additional <br />information play wll me a (970) 870-2730. <br />\^T\wcutytnilc Coal Compan'y' 4 <br />ace Shoemaker <br />Cnvtronmcuml Specialist <br />p.2 <br />Cc' DMG <br />CWPS Pcnnit No. CO-0042161 <br />