MINIMUM LOT SIZE BY SOIL TYPE TABLE
Lot sizes are in square feet.
N/A = Not allowed - not to be included in minimum lot size determination.
* = any slope or any number.
The soil types listed below have one or more limiting characteristics that make the soil type "N/A" or require on-site investigation, no matter what other characteristics of the soil may be present.
Soil Type Minimum Lot Size
6***H N/A, very poorly drained soil
*66*H N/A, fill does not meet the Standards for Fill Material (see Key to Soil Types)
76**H On-site evaluation needed (Usually filled, excavated or regraded sites)
KEY TO SOIL TYPES CONTAINED IN THE MINIMUM LOT SIZE BY SOIL TYPE TABLE
The soil types utilized in high intensity soil surveys 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 and E
Part A-Drainage Class
l- 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 Part B-6)
Part B-Parent Material
1- Glaciofluvial Deposits (outwash/terraces of sand or sand and gravel)
2- Glacial Till Material (active ice) Marine or Glaciolacustrine Deposits (3,4 or 5)
3- Very fine sand and silt deposits (glacial lakes)
4- Loamy/sandy over silt/clay deposits
5- Silt and clay deposits (ocean waters)
6- Evacuated, regraded or filled (see Standards for Fill Material below)
7- Alluvial deposits (flood plains)
8- Organic materials-Fresh water bogs, etc.
9- Organic materials-Tidal Marsh
Part 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 24 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, clayey texture.
4- Bedrock present in the soil profile 0 to 20 inches below the soil surface
5- Subject to flooding
6- Does not meet-fill standards (see Standards for Fill Material below) (only to be used with Part B-6)
7- Bedrock present in the soil profile 20 to 40 inches below the soil surface
8- Areas where depth to bedrock is so variable that a single soil type cannot be applied will be mapped as a complex of soil types and will have a Part C of 8
Part D-Slope class
B- 0 to 8%
C- 8 to 15%
D- 15 to 25%
E- over 25%
Part E-High intensity soil map identifier - H
The H is placed at the end of the soil type to identify the area mapped as meeting the standards for high intensity soil maps. On a preliminary map a P may be used instead of the H to indicate that, even though the soil scientist has used the connotative legend to identify the soils, the map does not meet the standards of a High Intensity Soil Map.
Example of a Soil Type Classified Using the Key to Soil Types:
A Marlow soil that is well drained, formed in a deposit of glacial till, has a hard pan layer at a depth of 20 inches, and has a slope of 10% would be mapped by the symbol 223CH. The Minimum Lot Size by Soil Type Table indicates that the minimum lot size per Dwelling Unit on this soil, 223-H in Slope Class C, would be 60,500 square feet.
Standards for Fill Material
1. Fill material consisting of organic materials or non-soil materials such as tree stumps, sawdust, wood chips and bark, bricks, asphalt, concrete, metal, wallboard, etc., even with a soil matrix should not be used.
2. The in-place fill should have less than 15% organic matter and non-soil materials by volume.
3. The in-place fill should not contain more than 25% by volume of cobbles (6 inch diameter) and stones (larger than 12 inches in diameter).
4. The in-place fill should not have more than 27% by weight of clay size (0.002 mm and smaller) particles.
5. The fill should be essentially homogeneous. If bedding planes and other discontinuities are present, detailed analysis is necessary.
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