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The depth of the deposit varies on average between four(4)to twenty(20)feet,with a possible <br /> maximum depth of 50 feet, located primarily at the tops of the knolls on the project property.The <br /> overburden is approximately 1.5-2 feet thick. Below the material to be mined is bedrock. <br /> The post-mined land use is residential development.The permit area is included in the Whitewater <br /> Community Plan(Amended July 14, 2011) and is zoned as Residential Medium Low. Figure 7, Future <br /> Land Use Map,Coffman Road Area, is included as Exhibit D-2.The permit area has no adjacent houses <br /> and is generally sounded on all sides by other mining operations, undeveloped vacant land,or BLM land. <br /> Topsoil,overburden,and gravel will be removed using loaders,dozers,or scrapers,,in all pits,establishing <br /> a vertical wall along the outer edges of the mined areas. <br /> The mining roads will be forty feet wide and will be graded to be no steeper'than 10 percent <br /> longitudinally.Culverts will be added at low points to convey any potential runoff under the road during <br /> storm events. <br /> r <br /> ,j <br /> A protected trail crossing with signage will be constructed at ftI'crossing with the Old,Spanish Trail. <br /> Other than this protected crossing,the Old Spanish Trail and",Gunnison River Bluffs Trail are outside the <br /> affected/disturbed areas. <br /> Phase 1: <br /> •�i� 9' ;I •i ;; ,, ,; Ili i, <br /> This location has the largest gravel deposit on the!'proparty.Topsoil stripped from the initial 5 acre Phase <br /> 1A mining area will be used to construct abrerlm to capture stormwater runoff along the edge of the <br /> disturbed area. As the operation advani additional portions of the berm will be built from the topsoil <br /> excavated.All overburden from the stripping of the initial 'portion of Phase 1 will be stockpiled on an <br /> I <br /> area to the west of Phase 1, as iadicat6,1d,on E c,i.bit D-1;IMining Plan Map. <br /> Mining will begin on the west side of Phase''l1 and'p"rogress in stages with excess overburden used to <br /> d ly r,•ii �• <br /> reclaim the previous stage and mantei'nr stormwater collection berms.Overburden will be placed in an <br /> even layer over the exposed be;drockl Gravel will be processed on-site and delivered to the scales in the <br /> northeast corner of the permit area, ia the proposed haul road. Phases 1G and 1H will be the last <br /> phases to be mli ed,within;this area,i�;aintained as a wraparound area and visual buffer. <br /> Runoff will not be allowed,to flow offsite from the disturbed areas.As the berms are built, hay bales will <br /> be placed along the outside'toe of the berm to provide alternate sediment control there.The berm will <br /> be seeded with an immediate cover crop of oats, at a rate of 80 Ibs per acre.Since this location is <br /> I.extremely dry,the cove'r'!ct f rop of oats will provide stability for the soil,and the roots will lessen erosion <br /> and provide,nitrogep fixing and soil improvement.Within 12 months of placement,the berms will be <br /> seeded with•fh'el permanent seed mix listed in Exhibit E Reclamation Plan. <br /> As mining continues beyond the initial 5 acres,slopes between the active mining area and adjacent yet- <br /> to-be-mined areas will occur at 1V:1H.Overburden will be placed to over the bottom of the mined out <br /> pit area and some could be sold as structural fill or could be placed in the stockpile area. <br />