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Topsoil suitability and stripping depth estimates are discussed <br />. in Table I-1. <br />DOW WEST PERMIT AREA <br />Several agronomic chemical and physical properties were used to <br />rate those soils sampled on the Dow West property for possible <br />topsoil limitations. This information may be found in Appendix <br />B of this Exhibit along with the discussion found below. <br />Channery material (coarse rock fragments) in varying percentages <br />occurs within all mapping units except the Silas series which was <br />mapped in the major drainage bottoms. For all practical purposes, <br />the depth at which channery material occurs in each mapping unit <br />determines topsoil suitability and topsoil stripping depths on the <br />property. The following list presents other factors affecting <br />topsoil suitability. <br />C~ <br />1. The pH values for those soils samples all fell within ranges <br />considered to be well suited for plant growth. <br />2. A soluble salt electrical conductivity (on a saturated extract <br />basis) greater than 4.0 mmhos/cm can signal problems in the <br />growth of many plants due to excessive soluble salts. None <br />of the soils sampled on the Dow West permit area were over <br />these limits. <br />3. Sodium absorbtion ratios exceeding 10 are generally considered <br />sufficient to develop stunted plant growth on cultured species <br />due to nutritional problems and poor soil structure. Soil with <br />ratios exceeding 15 are not considered suitable for topsoiling <br />materials due to high sodium concentrations. The highest <br />sodium absorbtion ratio enountered was 1.06 i__n_t_he B horizon <br />of the Parachute`loam. <br />~- <br />I-24 <br />