HomeMy WebLinkAboutApplication Files_85048_pg0180 Five isolated wetlands have been delineated on the site. One of the wetlands to the east is
associated etentionhas—in. T�+ -remai ina nds-are-typically
shallow and appear to provide limited flood storage during storm events.
Based on a review of the USDA Soil Survey of Hartford County, several soil types are
located at the site. These soil types are shown and described on the Soils map in
' Appendix 1. Soil types are also identified on the Drainage Area Maps in Appendix 2.
The USDA Soil Survey defines groups of soils into Hydrologic Soil Groups (HSG)
according to their runoff-producing characteristics. Soils are assigned to four groups (A,
B, C, and D Groups). In group A, are soils having a high infiltration rate when
' thoroughly wet and having a low runoff potential. They typically are deep, well drained,
and sandy or gravelly. In group D, at the other extreme, are soils having a very slow
' infiltration rate and thus a high runoff potential. They have a hardpan or clay layer at or
near the surface, have a permanent high water table, or are shallow over nearly
impervious bedrock or other nearly impervious material. The HSG classifications of site
soils are summarized in Table 1.
' Table 1 —Site Soil Classifications
Soil T e HSG Classification
' Windsor loamy sand A
Ninigret& Tisbury soils B
Agawam fine sandy loam B
Sudbury sandy loam B
Walpole sandy loam C
' A series of test pits were performed at the site in the winter of 1998. Additional soil
borings were completed in the fall of 2010. In general, these subsurface investigations
' confirm the presence of sandy soils to a depth of 14 to 21 feet over clay and silt consistent
with glacial lake deposits. The soil conditions appear to be relatively consistent
throughout the test pits and borings. Locations of the test pits and borings are shown on
' the Drainage Area Maps in Appendix 2.
Standpipes were installed in the test pits and monitored for groundwater elevations
' throughout the winter and spring of 2008. The groundwater monitoring revealed a
seasonal high water table at the site at a depth of two to three feet below the ground
surface. The regional groundwater flow direction in the area of the test pits at the site
' appears to be to the south.
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