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Custom Soil Resource Report <br />(Federal Register, 1994). Under natural conditions, these soils are either saturated or ~ <br />inundated long enough during the growing season to support the growth and <br />reproduction of hydrophytic vegetation. <br />The NTCHS definition identifies general soil properties that are associated with <br />wetness. In order to determine whether a specific soil is a hydric soil or nonhydric soil, <br />however, more specific information, such as information about the depth and duration <br />of the watertable, is needed. Thus, criteria that identifythose estimated soil properties <br />unique to hydric soils have been established (Federal Register, 2002). These criteria <br />are used to identify map unit components that normally are associated with wetlands. <br />The criteria used are selected estimated soil properties that are described in "Soil <br />Taxonomy" (Soil Survey Staff, 1999) and "Keys to Soil Taxonomy" (Soil Survey Staff, <br />2006) and in the "Soil Survey Manual" (Soil Survey Division Staff, 1993). <br />If soils are wet enough for a long enough period of time to be considered hydric, they <br />should exhibit certain properties that can be easily observed in the field. These visible <br />properties are indicators. of hydric soils. The indicators used to make onsite <br />determinations of hydric soils are specified in "Field Indicators of Hydric Soils in the <br />United States" (Hurt and Vasilas, 2006). <br />References: <br />Federal Register. July 13, 1994. Changes in hydric soils of the United States. <br />Federal Register. September 18, 2002:; Hydric soils of the United:States <br />Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric soils <br />in the United States. <br />Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service. U.S. <br />Department of Agriculture Handbook 18. <br />Soil Survey Staff.1999. Soil taxonomy: A basic system of soil classification for making <br />and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service. <br />U.S. Department of Agriculture Handbook 436. <br />Soil Survey Staff. 2006. Keys to soil taxonomy. 10th edition. U.S. Department of <br />Agriculture, Natural Resources Conservation Service. <br />(~ <br />18 <br />