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• • <br /> Orchard Mesa Agg <br /> 11/94 <br /> EXHIBIT "G" <br /> WATER INFORMATION <br /> The operation of the gravel pit is not expected to directly <br /> affect surface or ground water systems. <br /> he site is proposed to be surface-mined for the extraction of So�� <br /> soill and�el. The mining area boundary is sou o e 44..�rA <br /> '­Milltops, therefore only South flowing runoff is impacted by the 4+YS <br /> -„development. Runoff to the north is not disturbed and will d� <br /> continue to follow historic routes and flowrates. The excavation <br /> \will not be visible from the north. <br /> The site does not have any surface water or ground water presentW <br /> due to the low water table at the mining site. The area is in a <br /> desert setting and not prone to flooding from adjoining <br /> properties. <br /> Runoff from the mining area is currently retained by a pond <br /> constructed near the southwest property corner with an estimated <br /> storage capacity of 75, 000 cubic feet. A small earth dam <br /> approximately 6 feet high and 120 feet long blocks flow through <br /> an existing natural runoff channel and creates the pond. <br /> Proposed mining activities will create additional storage <br /> capacity through excavation of material which will leave voids <br /> for storage of runoff. All disturbed areas will drain into the <br /> property and will not produce offsite runoff. The existing <br /> retention pond is within the mining area and, if mined, could <br /> only produce additional storage for retention.�i /� ` ii 14� e&'bwt�/5/ r ,\ <br /> Under the requirements of other regulatory agencies, the site `L•u/J <br /> must be revegetated as a recl tion con 1 ion. This reclamation <br /> will consist of reseeding the disturbe areas with native grasses <br /> and shrubs which will reduce runoff volumes and aid in erosion <br /> protection of the surface. Attached are calculations (Page G-2) <br /> for runoff volumes produced by the mining area under developed i <br /> conditions prior to reclamation and revegetation (worst case) . <br /> From a drainage standpoint, no adverse impact is created by the <br /> proposed gravel pit. Historic and developed runoff from the ; <br /> mining area is shown to be retained, thereby having no affect on <br /> offsite properties. Mining activities during development of the <br /> pit can only increase the amount of available retention storage, <br /> given an excavation and grading scheme as proposed. Reclamation <br /> revegetation, required for the pit, will aid in the reduction off <br /> surface erosion once established. <br /> G-1 (/ IJ <br />