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The grading plan is described in Exhibit D. The quarry will primarily be reclaimed by backfilling <br /> the pit area and placing a backfilled slope to cover and buttress the landslide area. The grading <br /> will be completed using traditional construction equipment, and minimal blasting is expected to <br /> be required to create the upper highwall slopes. Reclamation of the current highwalls in the mining <br /> area will start above the current disturbance and continue downward to create the reclamation <br /> surface. Weathered granite will be pushed downhill into place or for loading and transportation <br /> to the fill zone. Drilling and blasting will create rock slopes with an overall slope of 1:1 (H:V). This <br /> slope will contain rock highwalls and vegetated benches. The lower slopes will be backfilled and <br /> graded to 2.25:1 (H:V). Steep slopes throughout the quarry will be used as borrow locations for <br /> the backfilled slope, and these borrow areas will be reclaimed once each area has been graded <br /> to the reclamation topography. <br /> Storm water from all areas of disturbance will be directed into the existing sedimentation systems <br /> for the mine. After the water is clarified it will be discharged into existing drainages. A CDPS <br /> discharge permit for the current operations already exists. Surface run off from the hills above the <br /> disturbed areas will be diverted around the stabilized and reclaimed slope. The reclamation <br /> drainage plan is included in Exhibit G. <br /> Topsoil Preservation <br /> Topsoil will be salvaged from areas previously reclaimed that need to be disturbed while <br /> implementing this plan. From analysis of previous project documents and CDRMS permit <br /> amendments, the topsoil thicknesses on newly disturbed acreages is approximately six inches <br /> thick. The topsoil tends to be poor on southern slopes and more organic on the northern slopes. <br /> Woody materials will be removed prior to salvage, and either removed from the area, chipped to <br /> incorporate into subsoils, or used as brush windrows for the stormwater plan <br /> Topsoil will be stockpiled for use in reclamation as plant growth medium. The location of current <br /> topsoil stockpile locations and the proposed new topsoil stockpile(s) can be found on Exhibit C-1. <br /> Castle estimates that approximately 40,000 cubic yards of topsoil are stockpiled on site in two <br /> stockpiles. Approximately 20,000 cubic yards are on the northern stockpile, and these are <br /> reserved for use on USFS land. The southern stockpile also contains approximately 20,000 cubic <br /> yards of topsoil, which can be used for reclamation anywhere on the site. The remaining 57,000 <br /> cubic yards of topsoil will be imported, or a growth medium will be mixed onsite. Soil will continue <br /> to be imported from offsite projects, and soil identified as suitable for use as topsoil will be <br /> stockpiled separately from other imported soils. Alternatively, a growth medium will be generated <br /> by mixing available soils with organic materials. Creating a growth medium is a common process <br /> when reclaiming mine sites where fertilizer, wood chips, compost, or other available organic <br /> material is mixed with the soil to provide the necessary nutrients. Imported topsoil and growth <br /> Pikeview Quarry Amendment 4 <br /> 2019 <br /> E-3 <br />