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♦ ERC Aquatic Resource <br /> Pit Project Site <br /> Delineation Report <br /> February 17,2023 <br /> i' 1` L x IQs <br /> Photo 13. Overview facing north of Aquatic Resource D, a Photo 14.Overview facing northeast of Aquatic Resource D, <br /> topographical depression in the southeast corner of the survey a topographical depression in the southeast corner of the <br /> area.This depression is likely filled with irrigation water during survey area. Broad leaf cattail and reed canary grass <br /> the growing season. observed within the depression. <br /> AQUATIC RESOURCE E (SOUTH PLATTE RIVER) OUTSIDE OF THE SURVEY AREA <br /> Aquatic Resources E (South Platte River), a known TNW, consists of riverine lower perennial stream bed <br /> (R2SB).The South Platte River is situated immediately adjacent and outside of the survey area to the east. <br /> The South Platte River flows south to north. <br /> The South Platte River was delineated based the ordinary high water mark (OHWM) and consisted of a <br /> well-defined bed and bank with flowing water. The riverbanks are steep and incised with various rip-rap <br /> (cement blocks, vehicle parts, boulders). Within the channel, vegetation has been stripped due to river <br /> flows.Above the channel,adjacent to the survey area,vegetation consists of eastern cottonwood(Populus <br /> deltoides) overstory trees with narrowleaf willow (Salix exigua) shrubs scattered throughout. The <br /> herbaceous understory is primarily ruderal grassland with smooth brome (Bromus inermis), woods rose <br /> (Rosa woodsii), common wild oat (Avena fatua), cheatgrass (bromus tectorum), perennial pepperweed <br /> (Lepidium latifolium), and field pennycress (Thlospi orvense). The dominate species within the floodplain <br /> consists of upland plant species (FAC-UPL). <br /> The channel containing the South Platte River contains a sandy gravel substrate with primary hydrology <br /> indicators of Al(Surface Water)and A3 (Saturation). Secondary indicators include 68 (Sparsely Vegetated <br /> Concave Surface), 610 (Drainage Pattern), C9 (Saturation Visible on Aerial Imagery) and D2 (Geomorphic <br /> Position).The South Platte River meets the criteria for a wetland based on the presence of an OHWM. <br /> Refer to Photos 15-20 below for characteristics within Aquatic Resource E. <br />