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Section 785.19 (c) Continued. <br />proved that some deposits thought to be alluvial, such as the low- <br />lying area in the southeast corner of Section 29, Township 4 North, <br />Range 86 West, are actually terrace and colluvial deposits thirty <br />feet above the incised stream channel. Based on the geomorphic <br />criteria described in the OSM Technical Guideline, most of the <br />areas of unconsolidated deposits mapped on the Twentymile Park <br />Hydrology (Map 6) were eliminated from alluvial valley floor <br />consideration, with the one exception of an area in the eastern <br />half of Section 7, Township 4 North, Range 86 West in the mine plan <br />area. <br />Mine Plan Area. The one area noted during the reconnaissance which <br />seemed to meet the geomorphic criteria described in the OSM Technical <br />Guideline is adjacent to the Eckman Park mine area. This area is <br />mapped in detail on the Eckman Park Stream Channel Cross Sections <br />(Map 51). The drainage in the ayes is through an ephemeral tribu- <br />• tary to Foidel Creek. This unnamed tributary is adjacent to and <br />drains the Eckman Park mine area in its headwaters, flows northeast <br />and then turns north near Pinnacle Peak, where it is fed by another <br />ephemeral tributary from the east, and finally meets Foidel Creek <br />one-half mile north of the mine area. At the southern base of <br />Pinnacle Peak is a depositional reach of the stream where a thorough <br />water availability field investigation was conducted, hereinafter <br />referred to as the "study area". <br />Water Availability Characteristics <br />Agricultural Activities. Section 779.22 contains a description and <br />map of agricultural activities in the mine plan and adjacent area. <br />The Twentymile Park Land Use (Map 31) shows that the historical <br />premining land use of the study area has been undeveloped range- <br />land. The description under Section 779.22 documents vegetation <br />type and productivity in the study area. There has not been a <br />• dependable, developed water supply for agricultural activities to <br />expand upon, hence the historical use has not been improved upon. <br />785-10 <br />