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Soil series phases and phases of series variants were delineated primarily on the basis of • <br />surface texture and slope. Small areas (less than two acres in size) of steeper or <br />flatter slopes or slightly differen t surface textures were not broken out into separate <br />phases. After determining the soil series, and the surface phase to which each profile <br />belonged, the soil phase boundaries were determined throughout their length in the field, <br />primarily by means of additional soil characterization auger holes and secondarily by <br />analysis of relative landscape position, parent materials, and vegetative indicators. The <br />soil boundaries were then delineated on the 1";400' scale black and white aerial photo <br />base map (dated 5/7/87). <br />Mapping detail was at an Order 1 level for the entire study area. Order 1 mapping units <br />consisted primarily of consociations and complexes. Taxonomic units were soil series, <br />soil series variants, great groups, and miscellaneous areas. Phases of soil series were <br />based on factors important to soil suitability and salvage as well as i nherent soil <br />properties. Map unit component percentages, and the percentages of major soil series <br />inclusions, were generated during the mapping phase. The slope categories used for the <br />map units reflect soil suitability and salvage depth as well as machinery limitations <br />related to topsoil salvage. All boundaries of mapping units were plotted in the field on • <br />the base map utilized for mapping. <br />All map units were delineated as follows: <br />o If soils were dissimilar (i.e., highly contrasting in physical and/or chemical <br />properties and/or depth of suitable soil), consociations of a minimum size of <br />1.0 acre were delineated. <br />o If soils were similar (i.e., lowly contrasting in physical and/or chemical <br />properties and/or depths of suitable soil), consociations of a minimum sire of <br />2.0 acres were delineated. <br />o Soil complexes were mapped when two or more kinds of soil or miscellaneous areas <br />were in a pattern so intricately mixed that the components could not be <br />separately delineated at the 1"400' map scale, i.e., the maximum size of mapping <br />inclusions in similar soils was 2.0 acres and the maximum size of mapping <br />inclusions in dissimilar soils was 1.0 acres. • <br />9-6-9 Revised 05/16/88 <br />