This key is used in determining soil types that are utilized in high intensity soil surveys for administration of lot size by soil type and wetland regulations. The soil types are defined as soils having the same soil characteristics of drainage class, parent material, restrictive features, and slope; and are designated by a five part symbol, the parts being A, B, C, D, E.
SYMBOL A - drainage class
1 - excessively drained
2 - well drained
3 - moderately well drained
4 - somewhat poorly drained
5 - poorly drained
6 - very poorly drained
7 - not determinable (to be used only with Symbol B-6)
SYMBOL B - parent material
1 - Glacoifluvial Deposits (outwash/terraces)
2 - Glacial Till Material
Marine ro Glacoilacustrine deposits
3 - Very fine sand and silt deposits
4 - Loamy / sandy over silt / clay deposits
5 - Silt and clay deposits
6 - Excavated, regarded or filled
7 - Alluvial deposits
8 - Organic Materials Fresh Water
9 - Organic Materials - Tidal Marsh
SYMBOL C - restrictive feature (if more than one applies, list the most restrictive)
1 - none
2 - bouldery, with more than 15% of the surface covered with boulders (larger
than 12 inches in diameter)
3 - mineral restrictive layer (s) are present in the soil profile less than 40 inches below the soil surface such as hard pan, platy structure, or clayey texture. For example of soil characteristics that qualify for restrictive layer, see Soil Manual for Site Evaluations in New Hampshire, pages 2-22, figure 2-8.
4 - bedrock present in soil profile 0 to 40 inches below the soil surface (bedrock is either a lithic or paralithic contact - see Soil Taxonomy p. 48-49).
5 - subject to flooding
6 - does not meet fill standards (see addendum - Standards for Fill Material ) (only to be used with symbol B-6).
X - areas where depth to bedrock is so variable that asingle soil type cannot be applied will be mapped as a complex of soil types and will have a symbol C of X
SYMBOL D - slope class
B - 0-8%
C - 8-15%
D - 15-25%
E - 25% +
SYMBOL E - high intensity soil map identified - H (see addendum)
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