2022-11-07_PERMIT FILE - M2022046 (15)

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6.4.4 EXHIBIT D— Mining Plan In addition to the mining plan map presented as Exhibit C2, the following planned mining activities are proposed for the Thompson Pit mining site: (a) Clearing and Grubbing Phase— Prior to the mining of a new phase of the quarry, the Operator (Montrose County) will clear existing vegetation from that area using a bulldozer. Trees and shrubs will be stockpiled for burning during acceptable periods of the year (winter months). (b) Earthmoving (topsoil stockpile) —After clearing and grubbing active mining area, the Operator will remove all available topsoil and stockpile in the areas designated on the mining plan map. The stockpile will be surrounded by a containment ditch bordered by straw wattles (erosion logs) to prevent sediment from leaving the mining site as detailed in the Best Management Practices (BMP) in Exhibit E— Reclamation Plan. Those BMP's will remain in place until the stockpiles stabilize. The Operator will use a bulldozer to pile the topsoil and a front-end loader and truck to load and transport the topsoil to the designated stockpile location. Mining — Initially, the Operator will use a track hoe to excavate sand and gravel for screening and crushing onsite. Additional equipment to be used are haul trucks and front-end loaders. (c) No water diversions or impoundments are planned for the site, however all existing drainages will be protected from offsite sediment migration by the BMP's presented in Exhibit E — Reclamation Plan. No groundwater is anticipated at the site and stormwater generally sheet flows over existing slopes to drainages to the southwest of the affected area. (d) The Operator anticipates, and the Mining Plan presents, active mining throughout the project site as three phases to last the estimated life of 75 years for the mine. The proposed mining phases are presented on the Mining Plan (Exhibit C2). Approximately sixteen (16) acres in Phase 1 will be disturbed the first year of mining to establish that phase boundary and set up stockpiles for topsoil and backfill. Montrose County plans on beginning the mining of sand and gravel deposits in late 2022 or early 2023. (d) The Operator (Montrose County) estimates that up to 25,000 tons of sand and gravel will be mined each year for seventy-five (75) years. The operator anticipates beginning mining operations in late 2022 and concluding operations in 2097. Mining will take place year-round with the majority of work being performed from January to August each year and limited operations, mining, hauling, etc. will be performed year round, as weather and site access conditions allow. (e) In addition to the two exhibit maps in Exhibit C, the following information is available for the project site: Thompson Pit Exhibit D