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GENERAL46848
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GENERAL46848
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Last modified
8/24/2016 8:21:16 PM
Creation date
11/23/2007 2:57:24 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2001022
IBM Index Class Name
General Documents
Doc Date
11/29/2004
Doc Name
Decision Doc. from ACOE on 404 Wetlands Permit
From
ACOE
To
DMG
Media Type
D
Archive
No
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Wet meadow vegetation communities aze found along the toe of the slope that sepazates the primary alluvial <br />terrace and the secondary terrace within the Green property. Wet meadow communities aze also found above the <br />large pond on the Green property and adjacent to the south boundary on both properties. The dominate species <br />are sedges and grasses including three squaze (Scirpus americanus), foxtail bazley (Hordeum jubatum) and blue <br />joint (Calamagrosits canadensis). <br />Mixed grassland vegetation is found within the reamaining azeas of the property. Grasses and forbs dominate this <br />community. The dominant species are inland saltgrass (Distichlis spicata), red and alsike clovers, and foxtail <br />barely. <br />Existing Hydrology <br />There aze six distinctive types of hydrologic features on the Croissant and Green properties. The first feature is <br />the Big Thompson River, a perennial drainage that flows across the northeast comer of the Croissant property. <br />The second type of hydrologic feature includes two surface water drainages that have been formed along the south <br />edge of the Croissant property and two drainages that have been formed along the southeast edge of the Green <br />property from irrigation tailwater. Irrigation tailwater originates from irrigated farmland on the secondary terrace <br />above the drainages. Within the north half of both properties is the third type of hydrologic feature; relict oxbows <br />(meanders) or historic channels of the Big Thompson River. The hydrology of some of the relict oxbows has been <br />recently altered by man-made drainage ditches that have been excavated throughout the oxbows. The ambient <br />hydrology of these features is affected by the irrigation t<ailwater drainages above. Man-made irrigation and <br />drainage ditches comprise the fourth type of hydrologic feature. One large drainage ditch traverses the Green and <br />Croissant properties from west to east, ultimately draining into a relict oxbow. Several small imgation ditches are <br />present within the properties. Some were found to contain water, while others appeared abandoned. The fifth <br />hydrologic feature includes seeps along the slope that separates the primary and secondary terraces. Seeps occur <br />at the toe of the slope as well as high in the slope face. The source water of the seeps was not detemuned during <br />our investigation. The final hydrologic feature includes three farm ponds located along the slope that separates <br />the prirraary and secondary alluvial terraces. Water for the ponds appeazs to be originating from pipes or ditches <br />from the secondary terrace and from groundwater sources. <br />Soils <br />Soils within the area of interest aze representative of their genesis and topographic position. The Natural <br />Resource Conservation Service (USDA, 1980) identified five soil map units within the properties. <br />The primary alluvial terrace adjacent to the Big Thompson River contains Aquolls and Aquents. Aquolls and <br />Aquents develop along bottomlands and flood plains of major streams. They are deep, poor]y drained soils <br />formed in recent alluvium. Commonly the sails have a loamy or clayey surface layer and are underlain by sand <br />and gravel within 48 inches. The differences between these soils are found in the color of their surface layers. <br />Aquoll and Aquent soils aze defined as hydric by the U. S. Army Corps of Engineers (USAGE, 1987). <br />The southeast comer of the Croissant property contains Paoli loam. Paoli loam is a deep, well-drained soil formed <br />in alluvial deposits on terraces. Typically, the surface layer is grayish brown loam and fine sandy loam about 25 <br />inches thick. The underlying material to a depth of 60 inches is light brownish gray fine sandy loam. This soil <br />type is not identified as hydric by the USAGE. <br />The slope that sepazates the primary and secondary terraces contains Cascajo gravelly sandy loam. This soil unit <br />is also found along the south edge of the Croissant property. This is a deep, excessively drained soil on terrace <br />edges and upland ridges. Typically, the surface layer to a depth of nine inches is a brown gravelly sandy loam. <br />Project: Green & Croissant Aggregate Mining Applicant: Loveland Ready Mix, Inc. Pg 8 of 53 <br />Corps FIe No: 200180205 Waterway: Big'n~ompson Wetlands, Weld County, CO <br />
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