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TABLE 3 <br />DEPTH OF SUITABLE TOPSOIL MATERIAL BY SOIL MAP UNIT <br /> Recommended Depthl <br /> of Suitable Material <br /> Topsoil (Principal restrictive <br />Map Component Percent of Depth Suitability features of <br />Unit Soils Map Unit (inches) Rating suitable material) <br /> • <br />Nihill Nihill channery 85 0-12 good 12 inches, good, none <br />channery loam 12-52 poor <br />loam <br /> Gubben 10 0-12 good <br /> 12-60 poor <br /> Ildefonso 15 0-12 good <br /> 12-60 poor <br />Nihill Nihill 85 0 to 6 or 12 good <br />channery channery 12-60 poor 6 to 12 inches, good <br />loam loams <br />6 - 258 <br /> other soils 15 variable variable <br /> <br />Detra Detra 85 0 to 16 or 29 good 16 to 29 inches, good <br />channery <br />loam other soils 15 variable variable <br />6 - 258 <br />Alluvial various 100 60 poor 0 inches, flooding, <br />land wet Torrifluvents cobbles and stones <br />Disturbed mixed 100 60 poor 0 inches, mixed soils <br />land soils <br />D. <br />