2010-05-25_REVISION - C1981008 (8)

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Temperate Zone Ornamental Plants, shows that alfalfa handles a soil conductivity of 4-8 mmhos/cm. The specific species cited is Medicago Saliva, which is exactly the same as that prescribed in the revegetation plan for Irrigated cropland. Also, this reference does not differentiate between topsoil and subsoil. Since WFC is maintaining a limit of 4.0 in the topsoil (Lift A), the revised limit of 6.0 mmhos/cm in the subsoil (Lit 8) should be conservative. These levels were approved in TR -57 in 2008 Also there are _ instances in the pre-mine so Is where some singlelm have an EC above 5 0 therefore WFC cannot out back an average of 5 0'n certain areas WEC that th EC levels shown for Lift A and tilt B in prime farmland, as well as single lift soils are maximums fqran mole If any __ one sample exceeds this level additional samples will be taken around 't as specified This es that th average will be well below 6 0 The e a es will be e orted for each landowner in the SoUSamplinq Report ' Specific level depends upon clay mineralogy, soil texture, and saturation percentage according to Dollhopf et al., 1981 4 The specific percentage of clay or sand allowed will depend upon clay mineralogy, organic matter content, consistence, soil lift, spoil characteristics, and size of sand fraction. ' These values may vary depending upon the plant species proposed for revegetation in specific locations (e.g., a soil with a high coarse fragment content throughout its profile may be completely salvaged if used for rangeland versus cropland postmine land use). Prime farmland Lift A will not have >10% cobbles and boulders (3 inches mean diameter and greater) and 15% coarse fraction (caught In a 2 millimeter sieve) by volume. The % volume is estimated visually. "This va fef se um was Meese based an The prime farmland Lift B criteria and single lift criteria were developed in conjunct on with Dave Dearstyne of abon H 3 33ue. is bas esfi, stated ft a! ft ale is to cc ice, is sets dut v sea file s stints 9 bei 'seed , ea t a su see. At t is new 1 le-rom 02 Mine, iis Manes. se u I t is pie e so 1 survey of 4998 show all values less ftion 0. -1! ht, ape t of H e be e 1 male a a3ed as subsol o I is pieviously backfill po to oft! a 100 ga Property in ear 2008 a o w 1 p, i �M tests. Save Bee sly e be a th ea sulablIV leve _f8.2 p, i k e I: R A ale. al the NRCS and Ed Baltzer. In cases where the Bench 1 material is used as the Lift B soil in prime farmland, it will meet the specifications for Lift B, as outlined in Table 2.04.9 -2. (Revised October 2009) 2.05.4(2)(d) -21