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• 2.06.1(5) Prime farmlands; not applicable. <br />2.06.1(6) Variances for delay in contemporaneous <br />reclamation requirement in combined surface and underground <br />mining operations; not applicable. <br />2.06.1(7) Mining of alluvial valley floors; not <br />applicable. Results of the field investigation are as <br />follows: <br />7 a The entire affected drainage is approximately <br />0.80 square miles (See Map 4-3 for drainage basin outline). <br />(7) (bI The mapped extent of alluvium is 3.96 acres <br />(Less than ten acres, see Map 4-2 for extent of alluvium) <br />based on area extent grater than one foot in thickness. There <br />is no alluvium based on the one meter rule. <br />7 c The alluvium averages 57.5 feet in width. <br />(7)(d) There is no surface water available for flood <br />irrigation. Carbon Junction Canyon only flows in response to <br />• precipitation and is ephemeral in nature; i.e., no spring <br />runoff occurs because there is no significant snowpack. The <br />area is not naturally flood irrigated. <br />No evidence of flood irrigation activity, current or <br />historic, could be located within two miles of the permit <br />boundary. The primary flood plain of the Animas River is the <br />only sub irrigated alluvial deposit found within a two mile <br />radius of the permit area. The U.S.G.S. did not identify nor <br />map any Qal on this stretch of the Animas River. <br />Standard flood plain irrigation occurs north of Durango. <br />Other local irrigation practices are described in previous <br />sections. There is no agricultural significance to the <br />potential of the area since no irrigation farming operations <br />can be found within two miles of the permit boundary. <br />7 e There is no evidence of sub-irrigated <br />vegetation except that associated with springs and seeps (See <br />Map 4-3). There are a few narrow leaf cottonwoods which are <br />phreatophytes, indicative of a shallow water table in the <br />canyon bottom. <br />(7)(f) There is no evidence <br />irrigation. <br />• <br />of historical flood <br />6-2 <br />