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Peak Ranch Resource <br /> August 5, 2020 <br /> Table D-2: Topsoil and Overburden Material Balances During Mining <br /> ContemporaneousPhase Material South Berm North Berm West Berm Available for <br /> Phase 1 43,560 1,540 16,265 3,347 22,408 <br /> Topsoi12 <br /> Phase 1 87,120 13,159 0 0 73,961 <br /> Overburden3 <br /> Phase 2 0 0 0 0 0 <br /> Topsoil <br /> Phase 2 0 0 0 0 0 <br /> Overburden <br /> On the southern portion of the site,the screening berm will be constructed using overburden which is top <br /> dressed in topsoil.The berms proposed for the north side of the site and the berm along the west edge of the <br /> site will be constructed entirely out of topsoil. All other topsoil and overburden stripped during Phase 1 North <br /> and South mining operations will be used in the contemporaneous reclamation of Phases 1 North and South. <br /> Additional details pertaining to reclamation can be found in Exhibit E. <br /> 4.0 STORMWATER <br /> Stormwater generated within the mining extents and some limited areas outside the mining extents will be <br /> contained within the mined excavation where it will infiltrate or evaporate. It is the intention and the <br /> expectation that no stormwater from within the mining extents will be surface discharged from the site. <br /> Stormwater runoff that is generated from within the affected area, but outside of the disturbed area,will <br /> discharge from the site to the river(except for a small amount of runoff that flows naturally into the excavation <br /> area). Peak Materials will apply for a Colorado Discharge Permit System (CDPS) permit issued by the Water <br /> Quality Control Division of the Colorado Department of Public Health and the Environment(CDPHE) in order <br /> to ensure that all stormwater discharges from the site are appropriately covered. <br /> Stormwater from mining areas will be directed into the mined excavation. This stormwater will then infiltrate <br /> the underlying alluvium and recharge the groundwater underlying the mine. Exhibit C, Sheet C-2C shows a <br /> detail of the direction of flow of onsite drainage during mining. Stormwater will be able to infiltrate the alluvium <br /> that comprises the deposit once it collects in the mine cell. During Phase 2, stormwater from disturbed areas <br /> will drain directly into the exposed groundwater lake or infiltrate into the ground. Surface water control is <br /> further discussed in Exhibit G. <br /> 5.0 MINING TIMETABLE <br /> Over the life of the mine, a total of 4.0 million tons of material will be extracted at a rate of roughly 400,000 <br /> tons per year. This will result a mine life (mining through reclamation) of approximately 10-15 years, <br /> depending on market conditions. Snowfall limits the season in which sand and gravel extraction operations <br /> can be conducted in the area, and thus,the Peak Ranch Resource will only be operating when the weather is <br /> conducive and generally above freezing temperatures.Typically, mining will occur from early-spring through <br /> late-fall, but this may be adjusted depending on weather conditions.Additionally, Peak Ranch Resource <br /> operations will be subject to the limitations or conditions of any other necessary approvals, such as the SWSP <br /> or augmentation plan. <br /> 2 Based on stripping six inches of topsoil from all disturbed areas during Phase 1,including the berm footprints and access road. <br /> 3 Based on stripping 12 inches of overburden from all mining areas during Phase 1. Berm footprint and access road not stripped of <br /> overburden. <br /> Gnx I..i,ki and Anceia(i�I'LL( D-5 O TETRA TECH <br />