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' Construct a small berm across the access entrance near the CDOT right of way. The berm is to be <br /> constructed on private property. The berm shall be rounded with an overall height of 12-15 <br /> ' inches and extend the entire width of the roadway. The purpose of this berm is to eliminate <br /> runoff near the bottom of the highwall area from entering the highway. Runoff behind the berm <br /> will drain westerly towards the existing 18-inch culvert under Highway 141 near the z ccess road. <br /> ' The access from Highway 141 is to remain open so the property owner can continue t 3 access the <br /> property. However,the existing locked gate shall be maintained to prevent unnecessary public <br /> ' entry into the property. <br /> ' Stockpile Area <br /> Create positive drainage along the top of the stockpile. A swale shall be graded from he high <br /> ' point in each direction to create the positive drainage. The Swale shall be a "vee" sw e, with 4 to <br /> 1 slopes and a depth of It foot. The longitudinal slope of the Swale shall correspond with the <br /> existing slope of the stockpile. The west swale shall terminate at the natural drainage, and the east <br /> swale shall terminate at the end of the stockpile. The flowline of the swale shall match the wash <br /> ' from the north. Refer to the Grading and Drainage Plan. <br /> Install a geotextile fabric on the steeper Swale area near the existing culvert. The fabr c shall be <br /> ' installed per manufacturer's specifications. <br /> The current reclamation plan states that the 60,000 cubic yard stockpile of minus Mn h material <br /> ' to be either removed from the site, or utilized as backfill material to attain the approxi ate 15% <br /> final slope requirement between the 25' buffer strip adjacent to Highway 141 and the iighwall <br /> area. However, since the stockpile has been undisturbed for about 10 years and the st>ckpile has <br /> ' significant vegetative cover, it is recommended that the stockpile is left intact and undisturbed. <br /> Highwall Area <br /> 1 According to the current reclamation plan,the final highwall configuration shall cons st of <br /> uneven steps and benches to enhance the aesthetic value. Benches shall be constructe to create <br /> ' 20±-foot high steps with 10 to 15 foot bench widths. This overall effect of the highwall area was <br /> completed during the mining operation as rock extraction continued into the face of th a cliff(s). <br /> ' Final reclamation of the highwall area shall follow the recommendations of the slope stability <br /> analysis. The results of the slope stability analysis are attached. Generally, the high all area will <br /> be"stabilized"via several benches of about 10 to 15 feet in width, interspersed with stepped <br /> ' areas of approximately 30t foot vertical rises. The highwall area will not be revegeta ed, as the <br /> area will not have suitable soils to sustain a successful vegetative cover. <br /> ' <br /> The current plan states that backfill material shall be utilized to create a 15 percent f I slope between the 25-foot wide buffer and the base of the highwall. The slope as it exists t y is <br /> approximately 10 percent. <br /> 6 <br /> 1 <br />