2004-02-24_REVISION - M1977153 (6)

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E-2 The reclamation plan is amended as Follows: Developed Surface Water Storage Reservoir The Hazeltine Pit, Parcels A, through Parcel E and the Brinkmann-Woodward Pit are being converted to a surface water storage reservoir (WR). As part of development of a surface water storage reservoir and to prepare the site to comply with current state regulations, Denver Water has installed a slurry wall around the perimeter of the described area, including the Road Runner's Rest II (permit M-1979-195). A separate amendment will be filled for the Road Runner's Rest II property. Plans and specifications for this slurry wall aze included as part of this amendment. The slurt•y wall construction consists of preparing a working bench, excavating a deep 3' wide trench into bedrock, filling the trench with a slurry mixture of bentonite clay and water, mixing the excavated material with more bentonite clay and native materials and backfilling the trench with this mixture. After the slurry wall is complete the bench area is restored and reseeded. After the slurry wall is properly cured, the ground surface is restored to its original condition resulting in no visible structures above ground. The slurry wall will provide an impermeable barrier that will prevent the ground water from entering the water storage reservoir, as required by the Colorado Department of Natural Resources, Division of Water Resources. Hydrologic Balance The ground water hydrology and hydrologic balance is discussed in detail in Exhibit G - Water. Water Conveyance Structures As part of the development of surface water storage facility, there will be several water conveyance structures added to the facility. Inlet structures to covey water from future storage facilities to the south and east will be installed as some future date. An outlet structure necessary to control deliveries of water to the South Platte River from the storage facility will also be needed. The pipe portion of the outlet facility will be installed as part of the construction of the roadway embankment for the 120~h Avenue extension project. Because the water storage facility is located within the existing South Platte River flood plain there is a possibility that spillways or hazdened (rip rap) areas will be needed to prevent flood flows from eroding embankments adjacent to the river. Top Soil Top soil that was removed from Parcels A and B and other areas on the site and has been stockpiled on the site. The slurry wall contractor is required to use all available top soil in