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Section 785.19 (e) Continued. • (4) For the purposes of this paragraph, a farm is one or more land units on which agricultural activities are conducted. A farm is gen- erally considered to be the combination of land units with acreage and boundaries in existence prior to August 3, 1977, or, if established after August 3, 1977, with those boundaries based on enhancement of the farm's agricultural productivity and not related to surface coal mining operations. Kerr Coal was producing commercial quantities of coal at the exist- ing Marr Mine and Kerr Tipple prior to August 3, 1977. This fact is documented in Colorado State Mining and Reclamation Permit 76-13, and in Table 1, Historical Production Rates, A material damage analysis has been performed and is presented in Section 785.19 (d). As documented by this analysis, no material damage to the quantity and quality of water in surface and ground water systems that supply alluvial valley floors will occur due to operations in the mine plan or tipple areas. The characteristics supporting the essential hydrologic functions of the acknowledged alluvial valley floors in the adjacent area will not be adversely affected. Thus, the significance of impact from the proposed operations on farming will be minimal, and there will be no inter- ruption, discontinuance, or preclusion of farming on any of the acknowledged alluvial valley floors. The material damage analysis was performed in accordance with the provisions of 30 CFR 785.19 (e)(3). A continuing environmental monitoring program will ensure the prevention or detection of possible material damage, and the comprehensive water quality control program and reclamation plan described in Section 784.21 will ensure mitigation of any adverse impact. Performance standards and proposed compliance measures for operations adjacent to alluvial valley floors are presented in Part 822 of this application. r , 785-46