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<br /> . 5 <br /> 6~ p <br /> I <br />Revised 1/11/80 <br />• Section 785.19(c) Continued <br />General <br />A field investigation and technical evaluation of all drainages <br />containing streams within and adjacent to the mine plan area has <br />been conducted in accordance with this Section and the draft OSM <br />Technical Guideline, "Technical Identification and Study of Alluvial <br />Valley Floors", dated revised August 15, 1978. The scope of the <br />investigation was carried from reconnaisance of the general area <br />defined on the Twentymile Park Hydrology (Map 6) to detailed research <br />of a specific study area. The investigation was conducted using <br />the scientific method of reviewing available literature; defining <br />the categories of data collection and the areas to be studied in <br />• detail; crollecting field data and observations; assimilating data <br />into tables, diagrams and maps; interpreting the data in each <br />category; and finally drawing general conclusions. In accordance <br />with the OSM Guideline, this report is divided into four major sub- <br />headings: Geomorphic Characteristics; Water Availability character- <br />istics; Effects on Essential Hydrologic Functions; and Conclusions. <br />In summary, the irrvestigation resulted in the conclusion that no <br />alluvial valley floors exist in the active mine plan area, and the <br />further conclusion that the essential hydrologic functions of any <br />alluvial valley floors which may exist within the general area will <br />not be adversely affected by mining operations. <br />n <br />U <br />785-9(a) <br />