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• -16 • <br />uurposes. Water availability and the geomorphic criteria discussed above <br />make it uneconomical to construct a flood irrigation system. <br />An irrigation ditch does cross the norttrern part of the permit area (see <br />Exhiuit II of the permit application). This ditch transmits water <br />diverted from the San i4iyuel River further upstream. The applicant does <br />not propose to disturb this ditch. The ditch does not receive any water <br />from the mine area. Therefore, no mine-related water quality impacts are <br />anticipated for water in the ditch. <br />subirrigation <br />A small amount of subirrigation does occur along the Tuttle Uraw stream <br />channel. f•luch of the alluvial ground water along Tuttle Draw is a result <br />of seepage from the irrigation ditch that was discussed above (see <br />Exhibit II of the permit application). In many areas where the <br />subirrigation occurs, the vegetation and soil quickly dry up arhen the <br />ditch is turned off from October to June. The subirrigation along Tuttle <br />Draw is not considered extensive enough to support agricultural <br />development. <br />Conclusion <br />Based on the preceding discussion, it is concluded that no alluvial <br />valley flours exist in either the permit area ur the potentially affected <br />area associated with Nucla Mine. <br />Reference Cited <br />United States E.P.A., 1977, Subirrigated alluvial valley floors: A <br />reconnaissance of their properties and occurrence in coal resource <br />lands in the interior Western United States. <br />VIII. Probable Hydrologic Consequences of Mining and Cumulat <br />This Cumulative Hydrologic Impacts Study (CHIS) is intended to assess the <br />probable cumulative hydrologic impacts of all anticipated coal mining <br />operations upon the general area of the mine. It is to include all <br />operations for which (•iLRU applications have been submitted and iruludes <br />the anticipated total life of mine. <br />For the purposes of this CH[S it was found that no other existing or <br />proposed coal mining operations exist near the Nucla Mine that need be <br />considered for cumulative impacts. Furthermore, the total anticipated <br />life of mine for the tJucla !•Iine does not extend past this five year <br />permit term, Therefore, the probable hydrologic consequences for this <br />