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REMEDIAL ACTION OBJECTIVES
Remedial Action Objectives (RAOs) provide a general description of what the proposed alternative will
accomplish. The following RAOs apply to all four Source Areas:
? Prevent the public from ingestion of soil, and direct contact with soil containing contamination in
excess of state or federal standards or that poses a threat to human health;
? Prevent the public from inhalation of airborne contaminants in excess of state or federal standards or
that pose a threat to human health; and
? Prevent the further migration of contamination from the source area that would result in degradation
of site-wide groundwater or surface water to levels in excess of state or federal standards, or that
pose a threat to human health or the environment1.
Area 7, because of its unique characteristics as a park containing a creek, has these RAOs in addition
to the general RAOs listed above:
? Prevent the public from ingestion and direct contact with surface water containing contamination in
excess of state or federal standards or that poses a threat to human health;
? Prevent the migration of contamination from Source Area 7 that would result in degradation of
surface water and sediment in the unnamed creek to levels in excess of state or federal standards or
that pose a threat to human health or the environment; and
? Prevent the ingestion of vegetables from Source Area 7 through the implementation of appropriate
institutional controls.
Expected Outcomes of Each Alternative
Preliminary Remediation Goals (PRGs) are identified for each Source Area in Table 1 (Area 4), Table 2
(Area 7), Table 5 (Area 9/10), and Table 6 (Area 11). The PRGs for each area address
concentrations of COCs within source materials (contaminated soil, NAPL or leachate).
Soil
The PRGs for soil are based on concentrations designed to be protective of human health for: direct
contact with soil (ingestion of soils and inhalation of vapors from soils); ingestion of vegetables grown in
the soil; and groundwater ingestion (chemicals leaching from soils into groundwater, causing
concentrations in groundwater to exceed either MCLs - if they are available - or risk-based
1It should be noted that contaminant migration from the source areas has already resulted in site-wide groundwater
contamination in excess of state standards. The RAO is intended to remediate each source area in order to prevent
further migration of contaminants from the source area.
