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Rifle Gravel Pit #1 June 2021 <br /> 4.1.2 CDOT CR 346 <br /> A copy of the signed Structures Agreement with CDOT is included in Attachment B. <br /> 4.1.3 Dewatering Pipeline <br /> Mr. Shideler, owner of the property that the dewatering pipeline will cross, has agreements <br /> in place with the structure owners on his property. Scott has requested copies of this <br /> documentation from Mr. Shideler; however, the agreements have not yet been received. <br /> 4.2 Adjoining Surface Landowners Map Information <br /> There are four adjoining properties with corresponding surface landowners (as depicted in <br /> Figure 3, Exhibit C1). <br /> • North—Colorado River Ranch, LLC <br /> • West- Rex Robinson Ranch, LLC; (includes the Swanson Colorado Trust; Ilgen, <br /> Carrol Jeanne; Rosa, Linda Jane; Robinson, James Dean) <br /> • South—Colorado Department of Transportation (CDOT) <br /> • East—Shidelerosa LLP <br /> This information was obtained from the Garfield County Colorado Land Explorer(Garfield <br /> County, March 2021). <br /> 4.3 Topography and Aquifer <br /> The existing surface topography is extremely flat and composed of several feet of fine- <br /> textured alluvial sediment overlying a highly permeable alluvial aquifer of coarse gravel. The <br /> coarse gravel material lies on bedrock, adjacent to the Colorado River(based upon <br /> available boring data). The only topography of note is the artificially excavated tailwater <br /> return channel of the Last Chance Ditch, with runs east to west across the property and <br /> generally bisects the property into northern and southern sections. Figure 4, Exhibit C2 <br /> depicts this feature. <br /> 4.4 Vegetation <br /> Vegetation in the project area is dominated by partially irrigated pasture lands, which are <br /> subjected to an inconsistent and uneven application of irrigation water via flood irrigation <br /> and subsurface seepage. The mixture of mesic and hydric soil conditions supports a mosaic <br /> of upland pasture areas and wet emergent meadows, with the water table so elevated in <br /> some portions that the wet meadows contain areas of open surface water. Some small <br /> areas contain sparse riparian woodland, dominated by non-native Russian olive (Elaeagnus <br /> angustifolia)with a sparse overstory of cottonwood (Populus deltoides). The wetlands that <br /> are on site were created by irrigation activities and will likely disappear in a relatively short <br /> period of time following the onset of dewatering. Figure 5, Exhibit C3 depicts the location <br /> and types of vegetation at the mining site. Figure 6 through Figure 8 show photos from the <br /> property. <br /> A site visit was conducted in November of 2020 to inventory the vegetation on the Shideler <br /> property for purposes of selecting a dewatering pipeline alignment that avoided wetlands. <br /> Attachment C includes a copy of the photo log and map from this site visit. A summary of <br /> the upland pasture, herbaceous emergent wetlands, and riparian woodland plant species <br /> inventoried during the site visit are listed in the following subsections. <br /> 9 <br />