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• Reproduced Table 2.04.9-2: Criteria for Evaluating Soil Suitability (Revised with NRCS <br />2008) <br />PARAMETER - UNITS <br />THRESHOLD SUITABILITY LEVELS' <br /> Prime Farmland Prime Farmland Lift B <br /> Lift A and Single-Lift Soils <br />PH <6.1->8.4 <6.1->8.4 <br />Conductivity (mmhos/cm) 4.02 6.02 <br />Saturation percentage (%) >80% >80% <br /> <25% <25% <br />Sodium adsorption ratio' >4 >4 <br />Exchangeable Sodium % >15 <br />Calcium carbonate percentage 15% >40% <br />• Selenium (ppm) <br />4 >.2 ppm' >1 ppms <br />Particle size All soil textures except: s, Is, sc, sic, c <br />Coarse fragments (%)5 >15% >35% one location; <br /> >10% 3" diam + (>25% average) <br />' The threshold levels are to be used as a guide in evaluating the suitability of a soil material for <br />reclamation. An evaluation should take into account the "total system". Interactive parameters <br />may either nullify or verify the significance of a potential problem. <br />2 The actual maximum acceptable salt level will depend on the plant species proposed in the <br />revegetation plan and the potential for upward salt movement. As pointed out in the Baltzer <br />report in Attachment 2.05.4(2)(d)-1-4, Dave Dearstyne of the NRCS said that a level of 6.0 in <br />the subsoil would not be detrimental to grasses or alfalfa. A study done by Curtis Swift, PhD, of <br />Colorado State University, (Attachment 2.05.4(2)(d)-2), titled Salt Tolerance of Various Temperate <br />Zone Ornamental Plants, shows that alfalfa handles a soil conductivity of 4-8 mmhos/cm. <br />• (Revised Nov 2008) Attachment 2.05.4(2)(d)-1-16