Soil Survey of Bristol County, Massachusetts

SOUTHERN PART

The following Map Unit Description is from the 1981 Soil Survey of Bristol County, Southern Part. Please note: map unit symbols are DIFFERENT for Bristol South and Bristol North reports, do NOT use these descriptions for Bristol North.

Ss-Swansea coarse sand. This soil is nearly level, deep, and very poorly drained. It is in depressional areas surrounded by gently sloping soils. Most areas have a network of dug ditches. Areas of this soil are typically rectangular and range from 3 to 125 acres. Most are about 10 acres.

Typically, the surface layer is light yellowish brown coarse sand about 1 0 inches thick and is underlain by black organic material 26 inches thick. The substratum is light olive gray loamy coarse sand and gravelly loamy coarse sand to a depth of 60 inches or more.

Included with this soil in mapping are areas where the thickness of the organic material is less than 16 inches. Also included are areas of Freetown soils. Included areas make up about 15 percent of the unit.

The permeability of this Swansea soil is rapid in the surface layer, moderate or moderately rapid in the organic material, and very rapid in the substratum. Available water capacity is high. This soil has a high water table at or near the surface during most of the year.

Most areas of this soil are used for cranberries. A few areas have been abandoned and have reverted to brush and trees.

The high water table makes this soil poorly suited to row crops, hay, or pasture. Installing drainage sufficient for the common field crops is difficult because of the lack of suitable outlets. The high water table also makes this soil poorly suited to trees. It causes a high rate of seedling mortality and restricts rooting, making trees susceptible to uprooting during windy periods. The wetness of the soil restricts the use of harvesting equipment.

The high water table is the main limitation of this soil for community development, especially as a building site or as a site for septic tank absorption fields and sanitary landfills. The low strength of the organic material is also a limitation for building, and the rapid permeability in the substratum causes a hazard of ground-water pollution in areas used for septic tanks or landfills.

Capability subclass: IVw.

Sw-Swansea muck. This soil is level, deep, and very poorly drained. It is in depressional areas surrounded by gently sloping mineral soils. Areas of this soil are irregular in shape and range from 5 to 75 acres. Most

are about 10 acres.

Typically, this soil consists of black organic material 26 inches thick. The substratum is light olive gray loamy coarse sand and gravelly loamy coarse sand to a depth of 60 inches or more.

Included with this soil in mapping are areas where the organic deposits are thicker than 51 inches and a few areas where the organic deposits are less than 16 inches thick. Included areas make up about 15 percent of the unit.

The permeability of this Swansea soil is moderate or moderately rapid in the organic material and very rapid in the substratum. Available water capacity is high. This soil has a high water table at or near the surface during most of the year.

Most areas of this soil are in woodland, mainly water-tolerant trees such as red maple.

The high water table makes this soil poorly suited to row crops, hay, or pasture. Establishing drainage is difficult because of the lack of suitable outlets. The water table also makes the soil poorly suited to trees. It causes a high rate of seedling mortality and restricts rooting, making trees susceptible to uprooting during windy periods. The wetness of the soil restricts the use of harvesting equipment.

The high water table is the main limitation of the soil for community development, especially as a building site or as a site for sanitary landfills or septic tank absorption fields. The low strength of the organic material is also a limitation for building, and the rapid permeability in the substratum causes a hazard of ground-water pollution in areas used for septic tanks or landfills.

Capability subclass: Vw.

More info on Swansea Soils

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