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S-rtzti,cin 1181.011 <br /> RECEIVED <br /> DEC 0 4 2017 <br /> .cion of Reclamation, <br /> Mining&Safety <br /> Mann Lake Holding LLC, believes no off site structures will be <br /> affected by the reclamation left to be completed at this facility <br /> and agrees to not excavate within 200 feet of any structures from <br /> this time forward until structure agreements are obtained or a <br /> Geotechnical study is completed and approved. <br /> Analysis <br /> All mining operations have ended on this mine and reclamation is <br /> nearly complete. No excavation will take place at the mine as it <br /> is now actively being reclaimed. The old gravel pit lake on the <br /> site is currently being backfilled with clean fill dirt as <br /> approved in the reclamation plan. This is allowed in the zone <br /> district (Agriculture) and the activity is approved in Adams <br /> County under a Conditional Use Permit issued in 2013 . <br /> Backfilling operations associated with the site takes place on <br /> the surface of the backfilled area that lays from 3 feet above to <br /> 10 feet below the surrounding structures. On the areas that are <br /> lower then surrounding structures, the slope down from the mining <br /> setback is stable and graded 2h to lv or flatter and reclaimed. <br /> In most areas the backfilling activities are more then 200 feet <br /> from any structure. <br /> All existing above water slopes were graded 2H to lV or less <br /> except on the fill face and have been stable for at least 10 <br /> years . Except where backfilling is taking place the under water <br /> slopes are 3h: 1v or less. The south perimeter slope is the <br /> highest above the filling area and has been graded and <br /> revegetated since the 1990 ' s . The closest structure to the most <br /> active area is the fence that surrounds the permit area. <br /> The closest point backfilling could take place is in the <br /> northwest corner near the stormwater outlet . On the north side, <br /> the top of the bank into the lake is approximately 20 feet from <br /> the fence and the west side is approximately 45 feet from the <br /> fence. The lake surface is 4 feet below the ground surface. The <br /> slope from the surface to the waters' edge is approximately 3 : 1 <br /> and is stable. The depth of the lake in this area is <br /> approximately 2 feet . <br /> The perimeter of the old lake where backfilling is taking place <br /> varies from approximately 225 feet to 740 feet from the fence <br /> line. Backfilling is done by piling imported dirt along the <br /> edges of the lake and using a loader to push it into the lake . <br /> The deepest part of the lake is due east of the main entrance and <br /> is approximately 10 feet at this time and ground surface where <br /> the lake is the deepest is 4 feet above the water so this means <br /> they are filling a 14-foot hole. As the dirt is pushed into the <br />