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GENERAL39128
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Last modified
8/24/2016 7:58:39 PM
Creation date
11/23/2007 10:00:54 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
General Documents
Doc Date
9/23/2005
Doc Name
Collum Area Preliminary Alluvial Valley Floor Assessment
From
Maxim Technologies
To
DMG
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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Mr. Jim Stark <br />September 23, 2005 <br />Page 3 of 6 <br />JBR Environmental Consultants, [nc., 1998. Kennecott Energy Colowyo Coal <br />Company L.P. Jurisdictional Waters Report Executive Summary, Seep and <br />Spring Survey, Wetlands and Waters of the U.S. Survey, Good Spring Creek <br />Jurisdictional Wetlands Survey and Riparian Habitats Survey Study Area C: <br />Report prepared for Colowyo Coal Company L.P., September 30, 1998 <br />Office of Surface Mining, 1985. Reconnaissance Maps to Assist in Identifying <br />Alluvial Valley Floors, West-Central and Northwestern Colorado. <br />(ii) Mapping of all lands that are currently or were historically flood irrigated, showing the <br />location of each diversion structure, ditch, dam and related reservoir, irrigated land, <br />and topography of those lands. <br />Field investigation revealed no evidence suggesting that flood irrigation ever occurred <br />within the proposed permit area. Preliminary review of the area identified only one site <br />that appeared to have been irrigated, thus requiring further investigation. This site is <br />located in the northeast quarter of Section 13, Township 4 North, Range 94 West. During <br />a site visit, CDMG staff noted that, based on the presence of introduced vegetation and a <br />structure that may have been a drainage ditch, the area appeared to potentially have been <br />irrigated. <br />This site was thoroughly examined subsequently, and the following characteristics were <br />noted: <br />1) Vegetation at the site was predominantly crested wheatgrass. <br />2) No distinct plow pan could be identified during examination of the soil profile at the <br />site. Platy soil structure to the surface and the absence of a plow layer suggests <br />heavy surface use of the area, perhaps as an equipment staging area or a livestock <br />corral. <br />3) The structure that appeared to be a drainage ditch on the slope west of the main road <br />was likely an old road embankment. It was nearly level and did not originate at an <br />upstream channel. <br />4) No topographic features such as berms designed to contain or direct water were <br />evident within the area. <br />Based on these findings it was determined that this site was not historically flood <br />irrigated. <br />(iii) Mapping of all lands included in the area in accordance with 2.06.8(3) and subject to <br />agricultural activities, showing the area in which different types of agricultural lands, <br />such as flood irrigated lands, pasture lands and undeveloped rangelands exist, and <br />accompanied by measurements of vegetation in terms of productivity and type. <br />The vas[ majority of tracts within the alluvial deposits delineated are undeveloped <br />rangeland. However, some small parcels along the West Fork of Jubb Creek <br />(approximately 24 acres total) were previously documented to be used for hay production <br />(Dames and Moore, 1980). Additionally, some vegetation in Collom Gulch is non-native <br />and may indicate limited historic use for hayland or feed grounds. Other exceptions to <br />undeveloped rangeland include small structures including corrals, roads, stream <br />crossings, reservoirs, and equipment staging areas. The use of the site investigated and <br />described in the section (ii) above is unknown. <br />"Scientists and Engineers Committed to Client Satisfaction" <br />
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