MCP Numerical Standards have been derived for three categories of soil that were designed to address a broad range of potential human exposures (Categories S-1, S-2 and S-3). The applicability of a particular soil category depends upon both the accessibility of the soil (measured primarily by depth) and the human activities that take place (or may take place) at the surface. Within a soil category there are further sub-categories identified by groundwater type: the soil standards within these subcategories have been modified by the potential for a contaminant to leach and degrade the site groundwater.

The MCP S-2 soil standards (310 CMR 40.0975(6)(b)) apply to soil associated with moderate exposure, including infrequent (or light) use by children. Activities commonly associated with the S-2 soil category include retail use and landscaped areas. The criteria that define the S-2 soil category are found at 310 CMR 40.0933.

The S-2 soil standards consider incidental ingestion of the soil and dermal contact with the soil.

Documentation for the S-2 Standards

List of Current Method 1 S-2 Standards - 310 CMR 40.0975(6)(b)

Supplemental Material

Dermal Adherence pdf format of Technical Update: Weighted Skin-Soil Adherence Factors doc format of Technical Update: Weighted Skin-Soil Adherence Factors

Technical Update: Background Levels of Polycyclic Aromatic Hydrocarbons and Metals in Soil pdf format of Background Levels of PAH and Metals in Soil doc format of Background Levels of PAH and Metals in Soil