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-5- 3. The applicant indicates that the baseline surface water monitoring program would be reduced following the collection of one year's data. Uther aspects of the operation's surface and ground water monitoring are not discussed. The applicant should provide a plan for the collection, recording, and reporting of ground and surface water quality and quantity data during operations and. reclamation. The plan should include surface water tiuonitoring on Grassy Creek, alluvial ground water monitoring, monitoring pond discharyes, and the monitoring of spring flow and spoil water, if appropriate. VI. Hydrologic Balance: Ground Water - Rules 2.04.5, 2. 1. Based on drilling information and field observation of operational mine pits at Grassy Creek by Division staff; yround water occurrence within the consolidated bedrock units to be excavated is quite limited. However, there is the potential that over a long period of time a water table will become established in the spoils of the backfilled pits. At least one monitoring well should be installed to the base of the backfilled spoils in each reclaimed mine pit to establish the presence or absence of water in the reclaimed spoils and monitor the quality of the spoils water (if present). Quarterly monitoring of water levels and water quality will be required. VII. Alluvial Valley Floors - Rules Z.U6.8 and 4.24 The applicant has made a negative alluvial valley floor determination based upon an alluvial valley floor reconnaissance investigation. A copy of the reconnaissance investigation was provided to the Division in September 1980, and a portion of the investigation (the two page text) is included in the application. The investigation identifies potential alluvial valley floors along Sage Creek and Fish Creek. These areas, however, are not hydrologically adjacent to the proposed operations and do not need to be considered at this time.. Upper Grassy Creek would not be identified as an alluvial valley floor because the valley is narrow, steep, and would not be useful for either flood irrigated or subirrigated agricultural activities. A lower area along Grassy Creek adjacent to the county road, includes approximately 20 acres of alluvium. This area has not been flood irrigated, and only about two acres of it are subirrigated. The applicant indicates that no known irrigation is practiced in similar valleys within a two mile radius, that irrigation would create erosion problems, and that irrigation would be economically unsound. Based upon this information the applicant concludes that the area along Grassy Creek is not an alluvial valley floor.