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been 3evelooed in order to indicate changes in hydrologic condi- <br />tions in the area during the course of operations at the UTL and <br />also *_o moni*_or restoration of the essential hvdrologic functions <br />if they are affected. <br />With respect to flood irrigation, no change is expected in <br />quality or quantity of water in the Highline Canal as a result of <br />operations at the UTL. Therefore, Powderhorn Coal Company does <br />not plan to undertake moni*_oring of the canal. (It should be <br />noted that the ditch operator maintains flow records for the <br />Highline Canal and these records are available for r=view,) <br />with regard to the essential hydrologic :unction of subirri- <br />• gation, Powderhorn Coal Company will monitor shallow ground water <br />levels at three (3) piezomete.rs and at one (1) well in the area <br />of the UTL Site. The locations of these monitoring sites are <br />shown in Exhibit I. The piezometers will be placed in the <br />recently excavated test pits, and the well will be located within <br />the rail loop (near the existing coal storage pile). (The well <br />will be of sufficient diameter to allow the collection of ground <br />water quality samples.) <br />water levels ~ai11 be taken on a monthly basis, and water <br />quality samples will be taken on a quarterly basis from the well <br />within the rail loop. It is believed that the rail loop area is <br />the most likely area for potential impacts to the quality of <br />• shallow ground water (due to Leaching of the coal storage pile). <br />3 <br />