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The top fifteen feet (15') and the lower fifteen feet (15') of each <br />drainage shall be installed with fifty percent (508) deeper rip-rap <br />than the average thickness. On all drainages with slopes greater <br />than five percent (58), rip-rap will extend a minimum twenty feet <br />(20') beyond the end of the slope. <br />Rock filter blankets may be replaced with a fabric liner. A non- <br />woven fabric or erosion control fabric liner with an EOS smaller <br />than U.S. Standard Sieve No 70 (0.21mm) with an open area not to <br />exceed ten percent (108), and openings greater than U.S. Standard <br />Sieve Size No. 100 (0.149 mm) with at least four percent (48) open <br />area. This shall be installed according to manufacturer's <br />specifications, and covered by six inches (6") of clean sand or <br />gravel from off site. Fabric liner shall be placed longitudinally <br />down the length of the channel. Fabric shall be placed <br />longitudinally up the sideslopes with a minimum three inches (3") of <br />overlap between strips, with 12" - 18" long metal anchors every <br />square foot. New fabric lengths should be shingle-overlapped with <br />the up stream fabric above the downstream fabric. Anchor trenches <br />at the top and the bottom of the slope shall be six inches (6") wide <br />and twelve (12") deep and anchored on one foot (1') centers. <br />Rock armoring shall be placed by dumping from a truck with a backhoe <br />or with a dragline using an orange peel bucket. The use of Dozers <br />should be limited to minimize segregation. The contractor should <br />minimize the passes with heavy equipment on the armored <br />installation. <br />Access to these sites shall be limited to access from public roads <br />or access roads within the GEC area. Contractors should not <br />consider access through the Energy Fuels permit area (Southfield <br />Mine), and hindrance of traffic passing to and from the active mine <br />should be minimized as much as possible. <br />A. Magpie Creek Diversion <br />The south side slopes of the Magpie Creek Diversion, south of the <br />Energy Fuels Coal facilities area and adjacent and north of the <br />West Pit pond were damaged during the summer of 1992. A portion <br />of the embankment of the West Pit pond washed out and a thirty- <br />inch (30") culvert from the West Pit was incompletely installed. <br />Remove the culvert and use in Task 3C. Use moist materials with <br />greater than forty percent (408) clay from the pond to mend the <br />diversion bank/pond embankment in the two locations, compacting <br />in one-foot (1') lifts with a hand-held compactor while <br />interfingering the repair into the existing embankment. (The <br />material shall make a ball when rolled in the hand.) Anchor a <br />bed of rocks with greater than nine inches (9") between the pond <br />outfall and the bottom of the Magpie Diversion or utilize the <br />-10- <br />