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GENERAL50142
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Last modified
8/24/2016 8:32:16 PM
Creation date
11/23/2007 5:41:46 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
General Documents
Doc Date
7/15/1991
Doc Name
ADDENDUM to FINDINGS OF COMPLIANCE FOR RN1
From
For Alluvial Valley Floor
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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Adjoining these deposits on both sides of the river aze deposits of course-grained <br />outwash (pediment) labeled Qpc. Geomorphically the deposits form lobes and <br />undulating topography that extend down to the low alluvial terrace deposits of the <br />identified Alluvial Valley Floor. These deposits aze easily identified on Map 8-3 by <br />the abrupt change in slope as one leaves the flood-plain and terrace deposits along <br />the river. The slope out-wash deposits aze flood irrigated which meets the <br />hydrologic criteria of an Alluvial Valley Floor but geologically they aze mixtures <br />Mancos shale and eroded alluvium that were primarily deposited by gravity flow and <br />sheet wash. As such, they do not meet the criteria of being stream-laid. During the <br />original review of the permit application these deposits were identified as part of the <br />AVF. Hut further review and interpretation of additional hydrologic and geologic <br />information during the Summer of 1991 indicated that the azea did not meet the strict <br />definition of an Alluvial Valley Floor. Deposits at the mouth of Steven's Gulch <br />mapped as Qpc on Plates 1 and 2, of the Geo-Hydro AVF Phase I study (Volume 4) aze <br />identified as slope outwash deposits. As such, they also do not meet the strict <br />definition of unconsolidated streamlaid deposits. The U. S. Soil Conservation Service <br />has identified the Aqua Fria sails in this area as "Farmland of Statewide Importance" <br />and not as prune farmland. Because much of the area is occupied by flood-irrigated <br />orchards, the Division feels these azeas aze worth protecting for their agricultural <br />contribution. Although these areas aze not AVF's the Division will require that these <br />azeas be treated as AVF's with respect to assuring that their essential hydrologic <br />functions be restored. On the basis of the information provided, the North Fork of <br />the Gunnison and it's associated alluvium, identified as (Al) on Plate No. 2 in those <br />portions of Sections 29, 30 and 31 in TL3S, R91W, and Section 36 in T135, R92W, which <br />lie roughly between the Fazmers Ditch and the North Fork of the Gunnison River aze <br />Alluvial Valley Floors. Slope outwash deposits and alluvial deposits located up-slope <br />(northwest) of the Fire Mountain Canal did not meet the geologic and water <br />availability criteria, and were given no further consideration. The Alluvial Valley <br />Floor along the North Fork continues downstream, as shown on Map 5-2. <br />The operator will be affecting 11.4 of the Terror Creek watershed. This azea and <br />the adjacent Terror Creek were not considered in the Division's original Alluvial <br />Valley Floor detP*-m~*+ation August 20, 1981 but were considered during the review <br />of the permit revision of June 20, 1985. The operator did not identify any areas <br />along Terror Creek that contain significant bodies of alluvium. Most of the deposits <br />aze colluvial in nature and confined to the immediate stream channel. The Morrell <br />Camp azea contains primarily clluvial deposits and as such does not meet the <br />definition of Alluvial Valley Floors. <br />East and West Roatcap Creek were also not determined to be Alluvial Valley Floors. <br />The sediments are predominately couvial in nature and are too Limited to support <br />agricultural activities. <br />In reviewing the original application, some concerns were raised over whether <br />Cyprus proposed to use augmentation water that would normally supply an AVF. <br />Cyprus responded by showing that Terror Ditch and West Reservoir waters supply <br />Garvin Mesa and an irrigated area known as "The Basin, " both of which aze out of <br />the valley floor complex and aze not Alluvial Valley Floors. Therefore, Cyprus will <br />not be affecting an AVF because of augmentation mitigation. <br />
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