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B-17 <br /> associated with the predominately sandy (loess) soils present at and around the Permit Area, no adverse <br /> impact is anticipated with respect to Ennis Draw and/or any associated wetlands. <br /> CSC is cognizant of the fact that all encroachments, fills, or crossings of wetlands and streams are strictly <br /> regulated by the USACE, and that any such activities may be regulated under USACE Section 404 <br /> permitting authorities. However,no mining,processing,or ancillary activities are proposed in or near Ennis <br /> Draw, and, there is no anticipated or demonstrated potential for any of the 3/4-mile distant Keenesburg <br /> Project activities to otherwise adversely affect the feature. <br /> Groundwater Resources <br /> The project area falls within the South Platte River Valley. Surficial aquifers therein generally contain the <br /> shallowest groundwater (where present), and consist of Quaternary deposits of alluvial gravel, sand, silt, <br /> and clay; or, eolian sand and silt (Rettew; 2019). The surficial aquifer associated with the South Platte <br /> River is known to range in thickness from about 20 to 200 ft. and range in width from about 1 to as much <br /> as 15 miles. <br /> Inasmuch as the Permit Area is situated in excess of 15 miles to the south of the course of the South Platte <br /> River, the site does not readily exhibit the presence of alluvial gravels, instead exhibiting the presence of a <br /> thick (up to 30 ft. or greater) surficial zone comprised of eolian sand and silt, which, in many locations <br /> throughout the immediate area, exhibit characteristics of dune-type deposits. <br /> The Permit Area is situated near the extreme northern extent of the Denver Basin aquifer system, which <br /> underlies an area of about 7,000 square miles that extends roughly from Greeley south to near Colorado <br /> Springs. <br /> The Denver Basin aquifer system is not well connected to other major aquifers in the area,and the surficial <br /> aquifer along the South Platte River Valley is the only other major aquifer near the Denver Basin. <br /> Shallow,discontinuous surficial aquifers overlie parts of the Denver Basin aquifer system,primarily along <br /> small streams that are tributary(from the south)to the South Platte River. The Denver Basin aquifer system <br /> consists of four discrete aquifers that are present in five geologic formations. The Permit Area is located <br /> along the borders of the Arapahoe and Laramie Fox Hills aquifer units. <br /> Keenesburg Project—Limited Impact 110 Application_May 24,2019 <br />