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alluvium had a TDS level of 760 mgll. Any recharge from Harvey Gap into the alluvium could slightly raise the level of salinity in the AVF. This would only occur in those portions of the AVF in immediate contact with Harvey Gap waters. As worst-case predictions account for the extreme conditions (see Section IH.F., Probable Hydrologic Consequences), no material damage to water quality or quantity is expected. 3. The essential hydrologic function of the alluvial valley floor would be preserved. The critical characteristics of the designated alluvial valley floor are the integrity of the present irrigation system and the ability of the surface water system to supply sufficient irrigation water to farming activities on the alluvial valley floor. As discussed previously, neither surface facilities nor underground workings will be located on or beneath the AVF. Mine entries will be driven along strike to the east, away from Harvey Gap Drainage. As a result, there is no potential for depletion of flows in Harvey Gap .Drainage (which is the conduit for imgation water from Grass Valley Reservoir to the AVF). The integrity of the existing water supply and irrigation system will be preserved. C. Alluvial Valley Floor Monitoring 1. Monitoring as outlined in Section HI of this document will be sufficient to detect any potential for impact to the productivity of irrigated lands on the AVF as a result of mining activity. Due to the low potential for impact, monitoring is not warranted at this time. 2. The proposed activities will comply with the requirements of the Act and the Regulations with respect to alluvial valley floors (2.06.8(5)(a)(i)(ii)). 3. An environmental monitoring system shall be installed, maintained, and operated by the permittee on all alluvial valley floors during surface coal mining and reclamation operations and continued until all bonds are released in accordance with Rule 3 (4.24.4). M:\OSS\BIW\EASI'S[DE. FD 20