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<br />' <br /> c. Subirrigation of the lands in question based on <br />' location of the water table and associated capillary zone. <br /> As discussed in the Water Availability Characteristics <br /> part of this section, both the Ward Creek valley and the <br /> Williams Creek valley in the area of the Red Canyon Mines <br /> are extensively flood irrigated. (Subirrigation in these <br />' valleys is limited to hardwood species of limited <br /> agricultural usefulness.) <br />' Therefore, based on the reasoning presented above, the <br /> areas of the Ward Creek and Williams Creek valleys <br />, <br />' (designated as Qaf, Qtl, Qt2, Qt3, and Qt4 on Map 7) are <br />• ' determined to be AVFs pursuant to Section 2.06.8 of the <br /> Colorado Rules and Regulations and the OSM AVF Guidelines. <br />' Preservation of Essential Hydrologic Functions <br /> Sections 4.24.2(1) and (2) of the Colorado Rules and <br />1 R <br />l <br />i <br />l <br />i <br />i <br />ti <br />h <br />l <br />i <br /> ons requ <br />m <br />egu <br />a <br />re t <br />at coa <br />n <br />ng and rec <br />amat <br />on <br />~ ' operations shall be conducted to preserve (or reestablish), <br /> throughout the mining and reclamation process, the essential <br />' hydrologic functions of AVFs not within (or within) an <br /> affected area. The regulations go on to state that these <br />' functions shall be <br />reser <br />ed b <br />maintainin <br />eolo <br />ic <br />th <br /> p <br />g <br />g <br />, <br />v <br />y <br />ose g <br />' hydrologic, and biologic characteristics of the AVF that <br /> support those functions. <br />' Based on discussions presented earlier in this section <br /> with respect to the characteristics of the Ward Creek and <br />1 <br /> <br />' 93 <br />