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• 0 Maximum Contaminant Level (MCL)-- Remediation--An action which will reha- The maximum level at which a particular chemi- bilitate contaminated media (such as groundwa- cal is allowed to exist in public water supplies. ter) to the appropriate levels, as defined by EPA. MCLs are set in state and federal water laws and are derived from health, cost, and technological Risk Assessment--The qualitative and quan- information. titative evaluation performed as part of the reme- dial investigation in an effort to define the risk Monitoring Wells--Wells used for gaining posed to public health and the environment. access to groundwater at various locations so that the vertical and horizontal extent of groundwater RWQCB--The California Regional Water contamination can be assessed. Quality Control Board, Central Valley Region, California Environmental Protection Agency. Operable Unit (OU) -- A discrete manage- ment unit which has been identified to provide Superfund--See CERCLA. partial mitigation or remediation of a contaminated site. Superfund Amendments and Reauthorization Act (SARA)--A federal law Record of Decision(ROD)--A public docu- passed in 1986 which modified the 1980 CERCLA ment describing which cleanup altemative(s) will Superfund law by strengthening EPA's authority, be implemented at a Superfund hazardous waste state involvement, and opportunities for public site. The ROD is based on information and techni- participation. Additional Superfund revenues were cal analyses generated during the RDFS study and also granted. incorporates public comments and community con- cerns. U.S. Environmental Protection Agency (EPA)--Federal agency charged with implement- Remedial Investigation/Feasibility Study ing CERCLA/SARA and other federal environ- (RI/FS)--A two-part study of a hazardous waste mental regulations. site that supports the selection of a remedial action for the site. The RI identifies the type and extent of Volatile Organic Compounds(VOCs)--Or- contamination. The FS identifies and evaluates ganic compounds (e.g., solvents) that vaporize alternatives for addressingsite contamination based readily at room temperature. on the results of the RI. 10