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bedrock varies widely in this map unit. Haplargids with varying depths to bedrock form on drainage <br />side slopes. Endoaquepts are formed where irrigation water has accumulated in drainage bottoms. <br />In a few naturally occurring areas of water accumulation Endoaquolls have formed. <br />Eolian sands are intermixed with Cretaceous Dakota and Burro Canyon Formations in map unit <br />98G (Bowdish - Bowbac complex). Soil is generally moderately deep with significant inclusions of <br />shallow soil on convex slopes. Soil salvage in this map unit may yield slightly less than predicted <br />Map unit 98H ( Wahweap fine sandy loam) occurs on mesa side slopes that are not as steep as <br />those found in map unit 98B. Hardness of bedrock varies depending on the underlying strata. <br />Wahweap soil has the same physical and chemical properties as those soils similarly named in the <br />survey area. Wahweap is outside the range of characteristics compared to the survey area, in that <br />it occurs in an area of 7 inches mean annual precipitation. <br />Table 2.04.9 -3 represents average depths and pH of lift layers for soil salvage materials in the 1998 <br />survey area. The recommended topsoil salvage depth for each map unit is based on the average <br />of all depth samples taken for the map unit. Appendix 2.04.9 -9 lists the percent composition for <br />each soil type in a map unit. Average lift depths are used to calculate volume of salvage material <br />in table 2.04.9 -4. Lift layer A is a combination of the following horizons where present: A, Ap, Ag, <br />AB, AC, Bw, and Bt if the pH of those horizon was less than 8.0. Lift layer B is a combination of the <br />following horizons where present: AC, Bw, and Bt if the pH of those horizons was greater than 8.0 <br />and Bk, Btk, and C horizons. The volumes are shown for a) the full thickness reported from the soil <br />survey and also b) 80% or 93% of the thicknesses from the soil survey, depending upon wether <br />the soils are prime or not. For prime soils, a 93% recovery is used. For non -prime soils, an 80% <br />recovery is used. This reduction is, in most cases, realistic, since the soil survey points do not show <br />some rocky areas that exist between sample points, thickness variations that cannot be fully <br />stripped in the field, and other constraints that occur with large equipment. <br />Table 2.04.9 -4 represents the acreage by map unit and the volume (cubic yards)of soil salvage <br />material by lift layer and map available in the 1998 soil survey area and which lies in the <br />disturbance area. The volume is calculated from the acreages and recommended topsoil salvage <br />depth. The recommended topsoil salvage depth for each map unit is based on the average of all <br />depth samples taken for the depth unit. Soil map unit 98B and 98H and all soil units north of BB <br />Revised September 2010 (PR 06) 2.04.9 -22 <br />