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• operations which satisfy the requirements of 2.06.8(5)(a)(i)(B)(I) above, <br />the geographic extent of lands eligible for such exemption shall be <br />limited to: <br />(1) for surface coal mining activities, those <br />lands which were identified in a reclamation plan approved by the Board <br />prior to August 3, 1977, or <br />(2) for underground mining activities, the <br />actual extent of the mine workings on August 3, 1977 and adjacent lands <br />for which there existed substantial demonstrable financial or regulatory <br />commitment to mine in the future. In such cases, the determination of <br />geographic extent shall be made by the Division on a case-by-case basis <br />using all available information. <br />• <br />(b} The significance of the impact of the proposed surface <br />coal mining operations on farming will be based on the relative <br />importance of the vegetation and water of the developed grazed or hayed <br />alluvial valley floor area to the farm's production. <br />(c) Criteria for determining whether a surface coal mining <br />operation will materially damage the quantity or quality of waters <br />include, but are not Limited to: <br />(i) Potential increases in the concentration of total <br />dissolved solids of waters supplied to an alluvial valley floor, as <br />measured by specific conductance in milli ohms, to levels above the <br />• threshold value at which crop yields decrease, as specified in :Sass and <br />Hoffman, "Crop Salt Tolerance--Current Assessment", Table 1, "Salt <br />2.06-43 <br />