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14 <br />• hot water extractable) and 5 <br />samples tested in the marginal <br />range (2-4 ppm B). With three <br />feet of sand placed over the <br />mixed spoil these trace elements <br />should not pose plant uptake <br />problems. It is suggested that <br />Mo and B be determined on plants <br />grown on the depth of sand-over- <br />clay study in 1979 to check out <br />this interpretation. <br />Because of the clayey, moderately saline and moderately <br />sodic nature of the overburden we recommend that a minimum <br />of 3 feet of sandy material be placed over spoils originating <br />from the Laramie formation. This recommendation should be <br />reviewed when longer term information is available from the <br />depths of sand-over-clay study (mentioned in the next chapter) <br />is available. <br />Soil test analyses were made of two-foot increments of <br />the sand (0 to 14') overlying the Laramie formation on one <br />core hole. The sand is calcareous at a dpeth of 6 to 8 feet, <br />poses no salinity hazard, and at depths below 4 feet is low <br />in organic matter and extremely low in plant-available phos- <br />phorus (Appendix C). These and other soil (Appendix B) and <br />overburden analyses (Appendix C) indicate that the sand at <br />depths of 4 to 10 feet which is above the zone of maximum <br />lime accumulation (obvious as white splotches and streaks) <br />and the more soluble salt accumulations (visible below or <br />within the maximum lime accumulation zone as crystals) is <br />suitable as subsurface plant growth material. . <br /> <br />