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TreadwelOR0110 <br /> i <br /> Area 16—A large number of volatile organic compounds in groundwater resulted in <br /> PEA-calculated HIs exceeding 1 for construction worker, child, and adult receptors. RA HIs <br /> exceeded 1 only for commercial/industrial and residents. PEA-calculated carcinogenic risks <br /> exceeded acceptable levels for construction workers and residents,but were within acceptable <br /> ranges for landscape maintenance and commercial/industrial workers. RA-calculated excess <br /> cancer risks were acceptable for all receptors, except residents. Blood lead concentrations were <br /> all acceptable. <br /> Area 21 —PEA-calculated HIs exceeded 1 for construction workers and child and adult <br /> receptors. RA HIs exceeded 1 for construction workers, residents, and landscape maintenance <br /> workers. Resident excess cancer risks exceeded acceptable levels. Lead concentrations did not <br /> represent a potential health hazard. <br /> • 1.5 Applicable or Relevant and Appropriate Requirements <br /> Applicable or Relevant and Appropriate Requirements (ARARs) are standards, criteria, or limits <br /> set under federal, state and local law that address hazardous substances, contaminants, and <br /> remedial actions at a specific site. ARARs typically include significant federal rules (i.e. RCRA) <br /> and state rules (i.e. Porter-Cologne),but may also include local rules, such as those pertaining to <br /> zoning regulations. <br /> ARARs can be chemical, action, or location specific. Chemical-specific ARARs are health or <br /> risk-based concentration limits for specific substances or chemicals. Examples are maximum <br /> concentration limits for drinking water. Action-specific ARARs are technology or activity-based <br /> requirements, the relevance of which depends on the type of remedial action under consideration. <br /> Examples are the RCRA regulations regarding waste treatment, storage, and disposal. Location- <br /> specific ARARs impose restrictions on characteristics of a site, such as fill in wetlands. <br /> In addition to ARARs, certain agency advisories or guidance are "To Be Considered" (TBC), <br /> ieven though not technically ARARs. For the Stockton properties, TBCs include EPA <br /> 8 <br /> 25970318.PGS 15 November 2000 <br />