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-1 soil standards (310 CMR 40.0975(6)(a)) apply to soil associated with unrestricted use. Activities commonly associated with the S-1 soil category include residential use, parks, playgrounds and schoolyards. The criteria that define the S-1 soil category are found at 310 CMR 40.0933.
The S-1 soil standards consider incidental ingestion of the soil, dermal contact with the soil and ingestion of produce grown in the soil.
List of Current Method 1 S-1 Standards - 310 CMR 40.0975(6)(a)
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