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• <br />TAB 15 <br />PROBABLE HYDROLOGIC CONSEQUENCES <br />Introduction <br />A Probable Hydrologic Consequences (PHC) analysis of a loadout area is appreciably <br />different both in magnitude and scope than a comparable analysis for a coal mine. the <br />areal disturbance is very limited, no significant excavations, excepting sediment ponds <br />and facilities (e.g., hoppers, coal reclaim bins), are needed, [here is no interception of <br />ground eater aquifers, [he number of sediment ponds is minimal and no spoil is created. <br />ih is analysis will address the relevant surface and ground eater quantity and quality <br />concerns. <br />Surface eater Dua ntity <br />The percentage of the Dry [reek drainage that ui ll be controlled by sediment ponds 001 and <br />002 a[ the loadout is only 0.00067. (see Attachment 15-1). Any surface water quantity <br />impacts associated with this loss of drainage area are unmeasurable and insignificant. <br />the quantity of surface eater available for any flood or subirrigate0 lields in the <br />drainage is uninfluenced by the loadout (see Alluvial Valley Floor section of Tab 14, PHB) <br />because all such fields identified are upd rainage from the Loadout. <br />Sediment ponds 001 and 002 have a combined storage capacity below the emergency spillua ys <br />of 3.4 acre-feet. One water right, Dry Creek Diversion, exists downstream from the HGT <br />loadout that could potentially be impacted by [he sediment pontl eater storage. The Dry <br />Creek Diversion diverts eater from Dry Creek [o the Walker Ditch as an occasional <br />supplemental source. Walker Ditch is righted for a floe of 2.697 cfs (1952 acre- <br />feet/year). Of this 1952 acre-feet, a portion of the Walker Ditch eater right (0.125 cfs <br />or 90 acre-feet/year) is controlled by HGi and is being transferred to Haytlen Gulch <br />Terminal, Inc. (HGT) with the sale of the loatlout. the 90 ac re~feet cransf erretl with the <br />sale is not being beneficially used and could more than offset any water quantity <br />depletions to that portion of [he Walker Ditch floe that is diverted from Dry Creek ([he <br />principal source of eater far Walker Ditch is the Yampa River7. Therefore, the sediment <br />ponds are not impacting any local eater rights. <br />• <br />1 Revised 03/01/93 <br />i lam. ~i <br />