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4-84 <br />• 4.7.5.3 Suitability as a Source Material for Reclamation <br />of Disturbed Lands <br />Table 4.7-2 is an evaluation of soil reconstruction material <br />for each horizon of each soil type in the permit area. The <br />evaluation is based on field descriptions, soil chemcial <br />and physical data (Appendixl and the criteria of Table 4.7-1. <br />The soils are rated good, good-fair, fair, fair-poor, or <br />poor sources of reconstruction material. The overall rating <br />given for each horizon is based on the most limiting factors <br />and the number of restrictive features. <br />Vegetation is difficult to establish on soils with high <br />SAR which indicates potential instability and water trans- <br />• mission problems (USDA, 1978). SAR values range from less <br /> than one to 5~3; most soils have values less than 5.0 and <br /> are rated good. Most subsoils are rated good to fair. The <br />disturbed land material (DL) is rated fair, good-fair and <br />fair. <br />Electrical conductivity is a measure of soil salinity. <br />Excessive salts restrict plant growth, create problems in <br />establishing vegetation and therefore also influence erosion <br />and the stability of the surface. EC values range from <br />less than one to 27.2 mmhos(cm; most soils have values less <br />than 5.0 mmhos/cm. All of the soils of the permit area are <br />rated good for salinity. <br />• <br />