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Custom Soil Resource Report <br /> Soil Physical Properties <br /> This folder contains a collection of tabular reports that present soil physical <br /> properties. The reports (tables)include all selected map units and components for <br /> each map unit. Soil physical properties are measured or inferred from direct <br /> observations in the field or laboratory. Examples of soil physical properties include <br /> percent clay, organic matter, saturated hydraulic conductivity, available water <br /> capacity, and bulk density. <br /> Engineering Properties <br /> This table gives the engineering classifications and the range of engineering <br /> properties for the layers of each soil in the survey area. <br /> Hydrologic soil group is a group of soils having similar runoff potential under similar <br /> storm and cover conditions. The criteria for determining Hydrologic soil group is <br /> found in the National Engineering Handbook, Chapter 7 issued May 2007(http:// <br /> directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=17757.wba). <br /> Listing HSGs by soil map unit component and not by soil series is a new concept for <br /> the engineers. Past engineering references contained lists of HSGs by soil series. <br /> Soil series are continually being defined and redefined, and the list of soil series <br /> names changes so frequently as to make the task of maintaining a single national <br /> list virtually impossible.Therefore,the criteria is now used to calculate the HSG <br /> using the component soil properties and no such national series lists will be <br /> maintained.All such references are obsolete and their use should be discontinued. <br /> Soil properties that influence runoff potential are those that influence the minimum <br /> rate of infiltration for a bare soil after prolonged wetting and when not frozen.These <br /> properties are depth to a seasonal high water table, saturated hydraulic conductivity <br /> after prolonged wetting, and depth to a layer with a very slow water transmission <br /> rate. Changes in soil properties caused by land management or climate changes <br /> also cause the hydrologic soil group to change.The influence of ground cover is <br /> treated independently.There are four hydrologic soil groups,A, B, C,and D, and <br /> three dual groups,A/D, BID, and C/D. In the dual groups, the first letter is for <br /> drained areas and the second letter is for undrained areas. <br /> The four hydrologic soil groups are described in the following paragraphs: <br /> Group A. Soils having a high infiltration rate(low runoff potential)when thoroughly <br /> wet. These consist mainly of deep,well drained to excessively drained sands or <br /> gravelly sands. These soils have a high rate of water transmission. <br /> Group B. Soils having a moderate infiltration rate when thoroughly wet.These <br /> consist chiefly of moderately deep or deep, moderately well drained or well drained <br /> soils that have moderately fine texture to moderately coarse texture.These soils <br /> have a moderate rate of water transmission. <br /> Group C. Soils having a slow infiltration rate when thoroughly wet.These consist <br /> chiefly of soils having a layer that impedes the downward movement of water or <br /> soils of moderately fine texture or fine texture.These soils have a slow rate of water <br /> transmission. <br /> Group D. Soils having a very slow infiltration rate(high runoff potential)when <br /> thoroughly wet.These consist chiefly of clays that have a high shrink-swell <br /> 34 <br /> SUMMIT BRICK AND TILE COMPANY- EDMUNDSON CLAY MINE NOVEMBER 2023 <br />