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Substitute Supply Plan for the 1 r Fvanct A°°rPDatw Onaralion (CDMG M-82-164). A vicinity map showing both the proposed and existing L.G. Everest operations is provided as Figure 1. The future MCR operations include: aggregate mining from a wet pit, a crusher and wash plant, an asphalt plant, and a concrete batch plant. It is anticipated that over the operational life of this site, there will be approximately 127 acres of groundwater surface exposed. However, the future of this operation will hinge on the economic environment of Summit County as it pertains to the.need for aggregate resources. During the two years that this original substitute supply plan will be in effect, the operators anticipate the following: First Year -Topsoil and overburden stripping, equipment transfer from off-site, exposure of up to 3 surface acres of groundwater in Mining Cell 1 (see Drawing ] ), 200,000 tons of aggregate mining and stockpiling, no concrete batching, and dry up of the historically imgated lands specified in this plan. Second Year -Phased exposure of up to a total of 13 acres of groundwater (initial focus on excavation and sealing of the eight surface acre Augmentation Pond), 450,000 tons of aggregate mining and stockpiling, 60,000 cubic yazds (yd') of concrete hatching, dust suppression and truck washing. WATER REQUIREMENTS The proposed MCR operation will produce a peak capacity of approximately 200,000 and 450,000 tons of aggregale during the fast and second years of the operation, respectively. Approximately 93,000 tons of the second yeaz total will be used in concrete hatching. Aggregate removal and processing will expose a maximum total of 13 surface acres of groundwater during the second year, including 8 acres within the Augmentation Pond. Prior to the last quarter of the second year of operation, the Augmentation Pond will be completed, sealed and filled with consumptive use water 881-025.110 Weight Water Engineers, Inc. Page 2