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i • COOLEY RESERVOII2 AND FULTON WILDLIFE AREA PIT Levised 07/09/99) EXHIBIT G WATER INFORMATION This first section is a Floodplain Issues Summary on activities proposed in the S. Platte River floodplain, and general standards for mining within the floodplain. The floodplain and floodway are shown graphically on Exhibit C-l, Pre-Mining Map, Exhibit C-2, Mining Plan Map, and Exhibit F, Reclamation Map. The next sections address Surface Water; Groundwater Impacts; Project Water Requirements; Water Quality Impact, Stormwater Management and Dewatering Controls; an Inventory of Lubricants and Oil Products to be Used or Stored on Site, a Description of the On-site Fueling/Oil Storage Facilities and the Containment Area, a Summary of Measures to be Lnplemented to Minimize Potential Impacts to Surface and/or Groundwater from Future Spills or Leaks of Oil Product, /tem #/4 and Figure G-1, Well Location Map and Monitoring Plan. Except for the data related to lubricants, oil products, fueling facilities, and measures to minimize impacts to surface and groundwater, TuttleApplegate prepared most of the data and information contained in this Exhibit. In addition, additional comments from a UD&FCD letter dated 04/26/99 have been incorporated into various Exhibits. For reference, a copy of this letter, without the drawing proposing changes to Exhibit C-2, Mining Plan Map, is included at the end of this Exhibit. Exhibit C-2, Mining Plan Map has been revised to reflect the proposed changes. Floodplain Issues Summary CAMAS Colorado, Inc. proposes to mine existing permitted property near 104'" Avenue and the S. Platte River. A significant portion of the mining area is located within the S. Platte River floodway and floodplain as defined by the Urban Drainage and Flood Control District (UD&FCD) and the Federal Emergency Management Agency (FEMA). Generally, it is accepted that the reclaimed mine pits are an advantageous use of floodplain areas, because if properly planned, they can maintain or can even increase important floodplain storage and conveyance capacity, provide buffering, and preclude more intensive development from the floodplain. The proposed reclamation of a water storage reservoir(s), undisturbed open space, and created wetlands buffer should further all of these goals. The proposed improvements in the floodplain include a temporary conveyor bridge over the S. Platte River with ramped approaches to the bridge, temporary overburden stockpiles, mining in some areas on both sides of river within 400' of the river banks, permanent stable water storage reservoir banks, and permanent created wetlands, as well as extensive undisturbed areas. The temporary features are expected to have essentially the same life as the mining activity, and will be removed when mining and reclamation of the site are complete.