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Flood irrigation on the AVF is by diversion of unaffected Trout Creek water. Subirrigation does not play a major role in maintaining the agricultural productivity of the AVF, but the quality of alluvial ground water would be maintained above the material damage suspect level of 3 mmhos/cm due to the fact that aquifer recharge occurs primarily in the spring and early summer when stream salinity levels are lowest, and the alluvial water would be further diluted by the low salinity Trout Creek irrigation drainage water. Alluvial Valley Floor Monitoring Hydrologic monitoring as discussed in Section VI.A and B of this document will be sufficient to verify projections and monitor effects of mining on the quality and quantity of water supplying the identified alluvial valley floors. VII. Water Ri hts and Replacement - Rules 2.04.7, 2.05.6(3)(a)(ii 3~C7Z'1 ~f'~ .. C~A-7R R Ground water rights are discussed in Section 2.04.7(1) within Volume and are recorded in Table 9 of Volume III. The location of wells is marked on Map 15 of Volume V. Ground water rights within Twentymile Park exist for water found in the Trout Creek sandstone aquifer, the Trout Creek alluvium, the upper Williams Fork sandstone aquifer and the Middle Creek alluvium. The utilization of ground water from the Trout Creek sandstone was not classified in great detail, but is used for domestic, industrial and irrigation purposes. The other aquifers' water is used domestically (TABLE 2). TABLE 3 documents the ownership of ground water rights in Twentymile Park, Cyprus Western Coal Equipment Company (CWCC) controls most of the bedrock aquifers, while individuals own all the wells in the alluvial aquifers. Nevertheless, CWCC controls 88% of the adjudicated ground water in the basin. TABLE 2: Ground Water User Classification in Twentymile Park Water Utilization Classification Domestic, Irrigation Domestic Stockwatering Commercial, & Irrigation Trout Creek SS Volume 15 8 5 311 % of Total 4.4% 2.4% 1.5 91.7 Trout Creek Alluvium Volume - 27 % of Total 100% -29-