PERMFILE135154

• Permit No: M1999034
• IBM Index Class Name: Permit File
• Doc Name: WATER INFORMATION
• Section_Exhibit Name: EXHIBIT G
• Media Type: D
• Archive: No

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COOLEY RESERVOIR AND FULTON WILDLIFE AREA PIT
(Includes Changes/Stipulations to the DMG Permit and Adams County Conditions in Italics)
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-1, 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 Implemented
to Minimize Potential Impacts to Surface and/or Groundwater from Future Spills or Leaks of Oil
Product, 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, including revisions to Exhibit C-2, Mining Plan Map on the location of 400' and 100'
mining plan limits where agreement with UD&FCD is required (CCP#3). 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 (CCP#3).
Floodnlain 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.