_PERMIT FILE - M2000002 (15) - Laserfiche WebLink

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EXHIBIT G Water Information The Tanabe Pit property is located in Adams County near the intersection of Old Brighton Road and 112'h Avenue. The site lies approximately one mile east of the South Platte River. Highway 85 lies to the east of [he site while 1 l2'h Avenue forms the northern boundary of the property. The Fulton Ditch crosses the far northwest comer of the permit area. The proposed mining operation will have minor impacts on the Soulh Platte River from depletions due to evaporation and operational losses. The impacts can be mitigated without injury to senior water rights. Exhibit Cincludes apre-mining plan that shows water resources on the property. The South Platte River passes approximately one mile west of the Tanabe Pit property. The Fulton Ditch crosses the far northwest corner of the permit area. There will be no impacts to the Fulton Ditch from the mittittg. No other active irrigation ditches occur on the property. The mining of the Tanabe Pit property will be completed in two phases and last approximately 5 years. As the material is removed, reclamation will follow with the construction of the reservoir liner proceeding immediately behind. In the long term, the reclanration of the mine will create one lined lake with an approximate area of 43 acres. The operation may consist of sand acid gravel washing onsite to process small amounts of the material. Most of the material will be conveyed across Old Brighton Road [o an existing permitted sand and gravel mining operation for aggregate washing and concrete and asphalt production. The site will be dry mined, and groundwater will only be exposed in [he dewatering trench. Prior to mining, a dewatering trench will be excavated around the perimeter of the mining cells. Groundwater will flow along the trench by gravity and will be routed across Old Brighton Road into a separate existing DMG Permit area. The project lies in the valley fill aquifer of the South Platte River. This is an unconfined alluvial aquifer and consists of the sand and gravel that is being mined. The depth to groundwater ranges from approximately 20' to 30' depending on the elevation of the underlying bedrock. The proposed mining site lies well above the principal aquifers of [he non-tributary Denver Basin. The property is located outside the 100-year floodplain of the South Platte River. It is estimated that sand and gravel underlying the overburden is approximately 25' thick. The underlying bedrock is the Denver Formation and is composed of shale and claystone layers that extend to greater depths. Water Consumptive Use Water use at the Tanabe Pit property will include evaporation from exposed groundwater and water pumped for dust control of haul roads and stockpiles. Tmmbe Pu DMG 1l? Permit Prtge l l a(46