2004-09-29_REVISION - M1999120 - Laserfiche WebLink

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04004 Exhibit G -Water Information Banks and Gesso, LLC (This exhibit was prepared for L.G. Everist, Inc. by Wright Water Engineers, Inc.) This section describes the water features on and near the amendment area, potential impacts on water resources from the project, and water requirements for the project. Surface Water Surface water features on and near the amendment area are shown on Exhibit C-2 and include: Little Dry Creek, which flows along the western boundary, • The East Lateral of the Lupton Bottom Ditch, which flows through the middle of the area, The South Platte River, which flows to the east of the area, and • The 100-year flood plain of the South Platte River, which encompasses the entire amendment area. The drainage referred to as Little Dry Creek along the western property boundary is not the original natural creek channel but a channel re-aligned years ago for agricultural purposes. The drainage is a small, perennial stream that carries both the natural flow of Little Dry Creek to the south, and irrigation return flows. The creek is also used as an irrigation ditch. Baseflow in the creek is typically 1 to 2 cubic feet per second (cfs}. The East Lateral of the Lupton Bottom Ditch traverses the amendment area. This lateral carries water during the irrigation season, but is typically dry the rest of the year. The South Platte River is located immediately east of the amendment area. Flow in the river is controlled by upstream reservoirs and water rights diversions. The entire amendment area is within the 100-year floodplain of the river, as shown on FEMA Flood Insurance Rate Map, Panel 868 of 1075, "Weld County, Colorado'. Groundwater Relatively shallow groundwater associated with the alluvial system of the South Platte River exists beneath the amendment area and adjacent areas. Published information shows that the general direction of groundwater flow is to the northeast, towards the river. The applicant has installed 16 (sixteen) piezometers to measure shallow groundwater near the amendment area (see the following Exhibit G: Monitor Well Locations). Data from these piezometers will be used to determine "pre-mining" groundwater levels to enable assessment of any effects on groundwater during and post-mining. The approximate locations of existing water wells in the vicinity of the amendment area are shown on Exhibit C-1. These wells include both shallow alluvial wells, and several wells completed in the Denver Basin formations. A well located south of the slurry wall (Permit No. 56746-F) provides the process water for the operation. No water wells are Fort Lupton Santl and Gravel Mine - L.G. Everist, Inc. September 20, 2004 Amendment to Permit No M-1999-120 Page 14