Laserfiche WebLink
• poor to prevent subirrigation of agriculturally useful plants. <br />This conclusion is made based on the poor quality of the water <br />samples collected in the alluvium (see Attachment B in II.C) and <br />on the fact that alfalfa, which is considered a phreatophyte <br />(Robinson, 1958), requires artificial flood irrigation in the area <br />in order to maintain a productive crop. Although alfalfa has a <br />rooting depth which can commonly reach beyond 11.5 feet (Robinson, <br />1958), its moderate sensitivity to salinity (Maas and Hoffman, 1977) <br />minimizes its use of subsurface water in the area. <br />c. Alluvial Valley Floor Identification <br />Because the valley near the Deserado Mine occupied by the White <br />• River is underlain by unconsolidated streamlaid deposits and <br />floor irrigation currently takes place, this area can be classified <br />as an alluvial valley floor. It should be noted that subirrigation <br />of agriculturally useful species is lacking and cannot be expected <br />in the future due to the poor quality of water in the alluvium <br />relative to the salt tolerance of deep-rooted, agriculturally <br />useful vegetation. <br />d. Effect of Mining <br />Surface Disturbances <br />As noted previously, surface disturbances on the White River <br />alluvium associated with the proposed Deserado Mine will consist <br />of relocating the county road and installing a water supply pipeline <br />• from the alluvial well field west to the west portal area and <br />4/81 II.D-20 <br />