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Rifle Gravel Pit#1 May 2023 <br /> 4.1 List of Permanent Structures <br /> Figure 3, Exhibit C1 depicts the permanent man-made structures contained on and within <br /> 200-feet of the Affected Lands. Table 1 lists these structures as well. <br /> • Last Chance Ditch tailwater channel <br /> • Last Chance Ditch irrigation lateral <br /> • Colorado River floodplain <br /> • Non-potable URSA Resources water lines (supply and return) <br /> • URSA Resources gas line <br /> • CDOT CR 346 and culverts <br /> • CDOT 1-70 Westbound Traffic Lanes <br /> • CDOT Wildlife Fencing (1-70 Westbound ROW) <br /> • Private Fencing East(Shidelerosa LLP) <br /> • Private Fencing North (Colorado River Ranch, LLC) <br /> SGM coordinated with these utilities as required for the access road design. A copy of the <br /> signed Structure Agreement for the CDOT structures is included in Attachment B and a <br /> copy of the Geotechnical Stability Report is included in Attachment C. Scott contacted all <br /> structure owners requesting structure agreements; only CDOT responded to the request. <br /> The Geotechnical Stability Report was prepared in lieu of structure agreements for the <br /> remaining structures, given the lack of response from the owners. <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, Carrol <br /> 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 subsurface conditions are typical of gravel pits and aggregate <br /> mines in the Colorado River floodplain with the surface layers consisting of approximately 6 <br /> inches of topsoil, perunderlain by one (1)to seven (7)feet of alluvially deposited fine <br /> 11 <br />