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57 <br /> GUIDELINES TABLE 3 Illustration 8, Page 9 <br /> 7312 - SOILS <br /> SOURCE: USDI Bureau of Reclamation <br /> Table 13 <br /> SUITABILITY RATINGS OF SOILS AS SOURCES OF TOPSOIL <br /> Factors Degree of Suitability <br /> Affecting Use <br /> Good Fair Poor <br /> Moist consistency Very friable, Loose, firm Very firm, <br /> friable extremely firm <br /> Texture fsl, vfsl, 1, cl, scl, sicl, s, Is, c and <br /> sil, sl, sc if sc if 2:1 clay sic if 2:1 <br /> t 1:1 clay is is dominant; c clay is dominant <br /> dominant and sic if 1:1 <br /> clay is duminant <br /> Thickness of materiai More than 16" 8-16" Less than 8" <br /> (generally upper- <br /> most part of profile) J <br /> Coarse fragments: Less than 3% 3-15": More than 157. <br /> percent, by volume <br /> Soluble salts: con- Less than 4 4-8 ncnhos/cm :tore than 8 rurJios/cm <br /> conductivity of mmhos/cm <br /> saturation extract <br /> Stoniness class 0 1 2,3,4 and 5 <br /> Slope Less than 8'/ 8-15i tore than 15% <br /> Soil drainage Draincge class not der.ermining Poorly drained, <br /> class 27 if better than poorly drained very poorly drained <br /> 1/ For class definitions see Soil Survey Minual, pp. 216-223. <br /> 2/ For class definitions see Soil Survey tLinual, pp. 169-172. <br /> S <br /> i1LM MANUAL Rol. 7-55 <br /> 1/4/74 <br />