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Doc Date:12/,,,2pp, III IIIIIIlI111111I1 <br />~~~ <br />~~ 2.06.8 Alluvial Vallev Floor Determination 1/ <br />• Panorama Resource Services, Inc. conducted a reconnaissance level <br />alluvial valley floor investigation for the permit and adjacent <br />area. The effort consisted of a review of available air photos <br />followed by walking the subject drainages and one air photo <br />targeted area. <br />The analysis of air photos revealed one plot of agricultural land <br />in the NW/SE Section 20, T33S-R63W. Upon examination It was <br />found to be a gently sloped surface that was 20-40 feet above the <br />level of a tributary to Engleville Gulch. Although it Is farmed, <br />it did not meet the criteria for flood or sub-irrigation . <br />A marshy area eaists immediately north and downstream of the <br />permit area adjacent to the seep shown on Ezhlbit AA. Although <br />it supported grasses and other vegetation watered by irrigation <br />and sub-irrigation, the area was too narrow and of insufficient <br />acreage to be considered for AVF status. <br />Traverses of the stream channels revealed thinly veneered bedrock <br />channels, waterfalls up and downstream of the permit area, and a <br />colluvial filled segment of Engleville Gulch within the permit <br />area. The longitudinal profile and cross sections of Engleville <br />Gulch, Ezhibits CC and DD, further attest to the lack of <br />conditions necessary to the formation of AVFs in the area. The <br />• Geomorphic Description, Rule 2.04.7.2.2a, prepared by Applied <br />Hydrology Associates, Inc. supports the ground observations. <br />Following is a letter from Mr. Lee Neve of the Soll Conservation <br />Service in Trinidad in which he states the lack of alluvial <br />valley floors or prime farm land in the area. <br />Due to the lack of qualifed areas, a separate AVF map has not <br />been prepared. The topography of the area is shown on the <br />Surface Water Map, Exhibit AA. <br />An aerial photograph showing the permit and surrounding areas, <br />taken in 1964, is shown in Exhibit II. <br />L J <br />-1- <br />