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~~-~ <br />blue <br />ribbon <br />`` coal <br />company <br />III IIIIIIIIIIIIIIII <br />999 <br />blue ribbon coal company <br />p. o. box 58 <br />delta, Colorado 81416 <br />(303) 874-7561 <br />May 17, 1984 <br />I~ ,L: ~UCV i'r <br />Mr. Robert G. Liddle <br />Reclamation Specialist <br />Colorado Mined Land Reclamation <br />1313 Sherman Street, Room 423 <br />Denver, Colorado 80202-2273 <br /> <br />Ci~.. ~ : ~ .,; uat.,,1~ ,,,wurces <br />RE <br />Dear Bob: <br />File IIC-047-81 <br />Hubbard Creek Flooding Report <br />Pursuant to our conversation the morning of May 15, 1984, this letter <br />is to further inform you of flooding on Hubbard Creek, its effects, and our <br />remedies. <br />Due to the recent unseasonably warm days recently and the above aver- <br />age snowpack, Hubbard Creek has flooded onto portions of our permit area. <br />The flooding the evening of May 14, 1984, was the highest in the history <br />of this mine, possibly 1200 CFS. The culvert for access across Hubbard <br />Creek was calculated to be sufficient to handle a 10 year 24 hour storm <br />event, but not much more. Last year's exceptionally high water washed over <br />the culvert a couple of times with a flow of 2-3 CFS, but not to the extent <br />of this year's flooding of 100-150 CFS over the culvert. <br />Flooding looked eminent this year. Therefore, work started on May 11, <br />1984, to build up the upper end of Pond 111 (NPDES 001), to place large rocks <br />along the roadside edge of the lower coal stockpile, and to build a higher <br />berm around the collar of the culvert. <br />Monday, May 14, a backhoe operator was on site when the water flowed <br />over its banks around 6:30 p.m. He attempted to increase the berm height <br />on the west side of the culvert, but was unable to contain the water. When <br />the water started to wash along the eastern edge of the coal stockpile, he <br />dumped 20 yards of roadbase along the edge of the pile. Water ran into the <br />114 pond (NPDES 003) from the road. In spite of the attempt to divert water <br />around the pond, it filled and overflowed, washing a hole in the embankment <br />10' wide and 5' deep. Regular checks were made with the backhoe to deter- <br />mine if debris was caught in the culvert. The flow dropped below the cul- <br />vert capacity around 9:00 p.m. <br />