Laserfiche WebLink
• The ratio is an indicator of dispersion, flocculation, porosity, <br />infiltration, permeability, 2rodibility, 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 C"QLRD. The water soluble Ca, 14g 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 />f4ean 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 frcm 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. Te;<ture 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 />