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<br />;vi .h resoect to the essential hydrologic function of subirri- <br />gation,_= is believed that following reclamation and abandonment <br />of the UTL Site (including removal of the coal storage vile and <br />sedimentation ponds), subirrigation will be restored to pre- <br />mining conditions and will continue to be largely regulated (both <br />from a quantity and quality perspective) by the nearby Colorado <br />River. It should be emphasized that no mining ep r S2 will <br />occur in the UTL Site area, and all disturbances are limited to <br />the immediate land surface. Any quality changes in the shallow <br />ground water system resulting from operation of the UTL will be <br />of short duration due to the proximity to the Colorado River and <br />• the extensive underflow associated with this relatively large <br />surface waterflow system. In addition, if a ground water quality <br />problem is detected by the implemented monitoring program, <br />mitigation measures will be undertaken, as necessary, prior to <br />abandonment of the Site. With regard to the potential for <br />elevated ground water levels due to leakage from sedimentation <br />ponds, it is believed that such levels would dissipate quickly <br />following removal of the ponds and that the water levels would <br />return to the pre-disturbance range of elevation (as regulated by <br />the Colorado River). <br />Environmental Monitoring <br />Based on the identified essential hydrologic functions of <br />• the AVF in the area of the UTL Sit_, a monitoring program has <br />7 <br />