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<br />Mr. Robert Liddle -2- 15 June 84 <br />When the dozer and excavator arrived around 3:00 p.m., logs and <br />debris were backed up 100 feet behind the culvert. The debris could <br />not readily be removed. Therefore, a trench was excavated and the <br />material piled on the stockpile side to further protect the stockpile. <br />Once flooding quit, damages were investigated. The worst problem <br />was the loss of an estimated two-fifths of the coal in the lower stock- <br />pile. Of this tonnage, an estimated 2,000 tons were trapped in the <br />willows on a two-acre creek bank between the stockpile and the main <br />channel of Hubbard Creek. Little investigation has been done on coal <br />down stream. A section of the road south of the scalehouse the width <br />of the road, twenty feet long and two feet deep was washed out, taking <br />the culvert draining the stockpile area. When the culvert plugged with <br />debris, water flowed over the road at the gate, causing part of the <br />large culvert to wash out. The submerged condition of the #3 Pond did <br />little damage to the embankment, but filled the pond with sediment. <br />The #4 Pond had 30 feet of embankment, the drain structures, and the <br />accumulated sediment washed away. The emergency spillway and the <br />embankment improvements on the northwest side of the #1 Pond paid off. <br />Water flowed in the northeast side, which has no embankment. The dis- <br />charge exceeded the capacity of the new 30' x 1%' emergency spillway, <br />but due to the creek level near the top of the south embankment, little <br />erosion was caused by the overflow. <br />Other results of the heavy rain for three days (and not a result of <br />flooding) were cracks closer to the office on the mine bench, cracks <br />in a portion of the access road to the #1 Pond, and additional rock <br />fall on the mine access road. <br />Clean-up has begun, but longterm solutions may take a while. The <br />road, where dug up and washed out, has been regraded to allow access to <br />the mine and to the National Forest. The debris has been dredged out <br />of the culvert collar area and piled in the empty coal stockpile area. <br />Work has started on dredging the #3 Pond; work will start within a week <br />repairing the #4 Pond. Clean-up is anticipated to start soon on the <br />two-acre creek bank pending dry conditions and consultation with your <br />office. <br />Solutions being considered now are (1) building up the bank on the <br />west side of the culvert, and (2) relocating the stockpile. Work has <br />begun to build up a high enough bank on the west side of the culvert to <br />force any overflow around the east side of the culvert. The damage to <br />the stockpile has renewed our interest in another stockpile at a higher <br />elevation. A technical revision would be submitted to request permission <br />to build a bench northwest of the present stockpile area, to transfer <br />the corral at the new site to the present stockpile area, and to install <br />the necessary drainage control. <br />Due to the characteristics of Hubbard Creek, there is no easy <br />solution to the recovery of the lost coal downstream. The coal down- <br />stream has, likely, been pulverized to fines and deposited with silt <br />-continued- <br />