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The ratio is an indicator of dispersion, flocculation, porosity, <br /> infiltration, permeability, erodibility, surface crusting and seedling <br /> emergence. <br /> The SAR of Nucla overburden and interburden is extremely suitable <br /> (Figures 6-3 and 6-4) . Water soluble Na, Ca and Mg analyses in addition <br /> to the SAR calculation are not truely warranted at Nucla Mine. However, <br /> SAR analyses were recommended for site 873E during Peabody's April 10, <br /> 1986 meeting with CMLRD. The water soluble Ca, Mg and Na analyses and <br /> SAR calculation were completed on all samples collected from site 873E. <br /> Saturation Percentage. The degree of saturation is highly influenced by <br /> the physical properties of the medium. Soils tend to be droughty, <br /> coarse textured and readily leached of nutrients when the water holding <br /> capacity at saturation is 25 percent or less. A high saturation <br /> percentage indicates a fine textured medium with potentially poor air <br /> and water permeability characteristics. <br /> Mean saturation percentage for all Phase I interburden and overburden <br /> locations is very suitable (Tables 6-6 and 6-7; Figures 6-3 and 6-5) . <br /> Excessive saturation percentages were associated with a thin two to four <br /> foot thick shale increment identified in the overburden at sites 3C, <br /> 695E and 775E. This lens is confined to the deeper (greater than 50 <br /> feet) overburden areas in the extreme northern and western areas of <br /> Nucla Mine. These areas will not be disturbed by the scraper pits. <br /> Since the EC analysis is determined from a saturated paste extract, the <br /> saturation percentages were determined on Phase II samples collected at <br /> Nucla Mine. <br /> Textural Analysis. Texture refers to the relative proportion of sand, <br /> silt and clay sized particles and generally relates directly to <br /> saturation percentage. Texture influences water infiltration and <br /> percolation, water and nutrient retention, surface crusting, shrinkage <br /> and swelling, frost heaving, compaction and erodibility. Textural <br /> problems are generally encountered when either sand contents approach 85 <br /> percent or clay levels are greater than 40 percent. The texture of the <br /> 6-28 Revised 3/6/87 <br />