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Rifle Grave! Pit ;,r i January 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. SGM conducted a <br /> utility field investigation on November 21, 2020, that informed this information. <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 /> SGM coordinated with these utilities as required for the access road design. Copies of the <br /> signed Structures Agreements are included in Attachment B. <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 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 /> sediments (primarily silts and clays). This overburden covers between seventeen (17) and <br /> twenty-two (22) feet of alluvial gravels that are the target of the extraction operation. Shallow <br /> groundwater, connected to the water table of the Colorado River, saturates the gravels, and <br /> is generally present throughout the project site at a depth of between one and one-half(1.5) <br /> and five (5) feet. The boring logs are included in Attachment C and provide details <br /> regarding the property and subsurface soil and groundwater levels. <br /> 11 <br />