Plymouth soils have sand or loamy sand textures throughout and all lack the thick dark colored surface horizons that is typical for Hempstead. Surface runoff is slow to moderate. Permeability is moderate in the A and Bw horizons and rapid or very rapid in the 2BC C horizons. The lower part of the solum tends to retain higher than normal moisture for short periods due to change in pore space between the solum and substratum. Most areas were originally used for farming but most have been converted to housing developments and similar urban uses since 1940.
Most underdeveloped areas are in parks or along older parkways.
It is a single contiguous area and is 12,000 to 15,000 acres in extent. Nassau-Suffolk soil survey, issued in 1928. The soils were first mapped as Hempstead in the 1903 Soil Survey of the Long Island Area, New York and later in the 1928 Soil Survey of Nassau and Suffolk Counties, New York. The series is currently listed as inactive. This revision is to reactivate the series and assign a firm classification.