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The operation will mine throughout the year, with most sales taking place during the <br /> construction season in the summer. Stockpiles of raw and finished material will be located in the <br /> southwest corner of the operation near the processing facilities. The mining areas and stockpile <br /> areas are shown on Map C-2. Mine life is based on production rates that are derived from <br /> expected annual sales. Market conditions may vary and will therefore affect the production rates <br /> and mine life. <br /> Table D-1 Approximate Mine Life <br /> Time ears <br /> Previously Mined 38 <br /> Remaining Mine Life 20-25 <br /> Total 50+ <br /> Note:These values are based on comparing the estimated pre-mine topography(Map C-1)and quarry extents shown <br /> on Map C-2. <br /> The material volumes described in Table D-1 are calculated from limited drilling on site. The <br /> quarry itself is roughly 130 acres in size. Processing and stockpiling will take place in a 126-acre <br /> area occupying the southwest corner of the permit area. <br /> The topsoil on site will be stripped from undisturbed areas prior to their mining, screened to <br /> remove large rock pieces, and then used in reclamation activities. This is further discussed in <br /> Exhibit E. <br /> Basalt will be carried to the processing area via haul truck. Highway trucks will haul sellable <br /> 1=i material to market from the processing site. Truck traffic will be along Highway 93. <br /> 2018 Slide <br /> In the summer of 2018, a slide of material on the west side of the basalt dike of the Ralston <br /> Quarry occurred. Material from this slide was excavated and placed in a permanent embankment <br /> southwest of the slide area, as shown on Map C-2 and discussed in the Ground Engineering <br /> Report. The material placed in this area has been compacted and placed to a slope of 3H:IV. The <br /> area of the slide and the embankments can be seen on Map C-2. Stormwater controls for this area <br /> are shown on Map C-2 and Map C-4. Exhibit G contains more information on the stormwater <br /> controls.No material from the slide was sold or used in activity related to the rest of the quarry <br /> operations. <br /> Ralston Quarry CrM Irwkki and Aswciahx.PLIA' <br /> January 2019 D-2 <br />