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<br />] 985 through 1988 at which time the mine closed, then re-opened under the operation of Rocky <br />Mountain Materials and Asphalt Inc. in 1992. <br />A storm event occurred in the area of the quarry from April 29 through May 1, 1999 <br />resulting in significant rain fall in the area. According to facility personnel, tree branches lodged <br />in the culvert under the quarry haul road during this rain event, causing Red Creek to overtop it'< <br />bank and flow across the quarry floor. According to facility personnel, the water flowed into the <br />lower sediment basin, washing out the berm and releasing the contents of the sediment pond. <br />Downstream citizens experienced a large amount of sediment deposition on their properties from <br />this storm event. <br />INSPECTION: <br />EPA inspectors arrived at the Red Canyon Quarry at ] 1: ] 5 am on May 22, 2000. The <br />EPA inspectors and Corps representatives met the facility personnel at the entrance to the quarry. <br />Mr. Brink and Ms. O'Connor presented their credentials and explained the scope and purpose of <br />the inspection. The decision was made to start the inspection at the upper crossing, move up <br />through the quarry and end with the lower crossing. The weather was sunny and warm. <br />Upper Crossing <br />The upper crossing refers to the area immediately above the quarry entrance at which a <br />drainage is directed under the paved road to Red Creek. The crossing consists of an 18 inch <br />culvert (photos ] & 2). Some deposition of sediment was observed in Red Creek down stream of <br />the upper crossing (photo 3) as well as above the upper crossing confluence (photo 4). Questions <br />have been raised by concerned citizens regarding whether or not Red Creek has been moved due <br />to quarry operations. Mr. Stack stated that the creek has not been moved since he took <br />ownership of the quarry in 1973. Photo 5 shows the unnamed drainage from the bridge which <br />connects the quarry area to Mr. Stack's home. <br />Lower Sediment Basin <br />The quarry area is composed of approximately 55 acres of affected area, with about 20 <br />acres disturbed by the mining process. In the active mining area, Rocky Mountain has graded the <br />area to the high wall in an effort to minimize the runoff from the mined area. Photo 6 shows one <br />of the overburden piles. The lower sediment basin is located on the southeast side of the road <br />adjacent to Red Creek. Photo 7 shows the basin from the quarry area, and photo 8 shows the <br />n~~~.+ ~n rl,~ppn~{ wa1L While the nn.~ is rlPCignPr~ ac an Pv'rpnrati_~nnr~ the rinr~ rl arPa <br />would be the location of the spillway if the pond was to overtop. The pond is reportedly cleaned <br />out once per year, with the material being sent to the asphalt plant. According to facility <br />personnel, the capacity of the pond at the time of the inspection was nine (9) acre feet. The pond <br />had recently been resized to hold what was calculated by the facility as the 10 year 24 hour storm <br />event. In May 1999 the pond had been increased in size to hold the 2 year 24 hour storm event. <br />