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ADDENDUM 9-6-2 (Cont.) <br />Soil Interpretations <br />FOOTNOTES <br />.o <br />rn <br />rn <br />A <br />R <br />N <br />m <br />v <br />0 <br />rn <br />m <br />1 Texture of Control Section: as defined in SCS (]975), Soil Taxonomy (p, 383-386). The textural control section is generally the upper 20 inches or the <br />whole of an argillic horizon; or from 30-40" or bedrock whichever is shallower; or the whole soil if bedrock is 14" deep or less. <br />2 Depth: refers to the soil profile depth before encountering bedrock or a paralithic contact. <br />Depth Class <br />Very Shallow <br />Shallow <br />Moderately Deep <br />Deep <br />Very Deep <br />Inches <br />less than 10 <br />10-20 <br />20-40 <br />40-60 <br />greater than 60 <br />3 Major Rooting Depth: depth to which the majority of plant roots were observed to occur. <br />4 Internal Drainage: refers to aera tlon or saturation characteristics within the soil profile. Well drained soils allow water to move through the profile <br />readily but not rapidly, and soil aeration is typically not a problem. Somewhat excessively dra toed soils allow water to move rapidly through the profile, <br />and are typically droughtly, sandy, and poorly developed. Somewhat poorly dra toed (SWP) soils have a wet state relatively high in the profile for a <br />significant length of time to Impede most uses, unless artfflcally drained. Poorly drained soils commonly are wet at or near the surface during a <br />considerable part of the year. <br />5 Permeability: Permeability is a characteristic of soil which relates to the movement of water through the profile. Permeability criteria are based on the <br />rate at which water moves through the most slowly permeable layer to a depth of 60 inches in a saturated soil profile. <br />Permeab111ty Llass Rate (Snches/hour) Typical Soil Texture <br />Yery Slaw less than 0.06 <br />Slow 0.06-0' 2 <br />Moderately (Mod) Slow 0.2-0.~6 <br />Moderate 0.6-2.0 <br />Moderately (Mad) Rapid 2.0-6.0 <br />Rapid 6.0-20.0 <br />Very Rapid More than 20 <br />• <br />clay, silty clay loam, and silty clay <br />heavy clay loam <br />clay loam and silt loam <br />loam, very fine sandy loam, and sandy clay loam <br />sandy loam and loamy sand <br />gravelly loamy sand, sand, and fine gravel <br />coarse gravel <br />• <br />• <br />