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"applicable" to a hazardous substance, pollutant, contaminant, remedial action, location, or <br /> other circumstance at a CERCLA site, address problems or situations sufficiently similar to <br /> those encountered at the CERCLA site that their use is well suited to the particular site. <br /> Aquifer--Bedrock or sediments below the ground surface that are saturated with groundwater. <br /> Comprehensive Environmental Response,Compensation,and Liability Act (CERCLA)-- <br /> A federal law passed in 1980 and modified in 1986 by the Superfund Amendments and <br /> Reauthorization Act (SARA). The act created a trust fund, known as Superfund, to <br /> investigate and clean up abandoned or uncontrolled hazardous waste sites. Figure 1 is a <br /> graphic that answers the question, "What is Superfund?". The act requires the Defense <br /> Logistics Agency to reach agreement with the EPA for remedial action at DDRW-Tracy and <br /> to perform the remedial action. <br /> U14r'Cleanup Levels--Compliance standards for cleanup of groundwater including risk-based <br /> UU action levels and applicable or relevant and appropriate requirements. (hfs( coyxerft�m,` <br /> the levels �O Wh�c� the a�urre�m�5f be r�s4�red' fhr�u�h rrmrdrah6�t , <br /> DTSC--Department of Toxic Substances Control, California Environmental Protection <br /> Agency. <br /> Groundwater--Water found beneath the earth's surface that fills pores between soil and <br /> gravel particles to the point of saturation. Groundwater often flows more slowly than surface <br /> water. Groundwater is the source of 80 percent of the United States' water supply. <br /> Interim Remedial Measure (IRM)--An action which is designed .to prevent immediate <br /> health or environmental risk by exposure to contaminated media. The IRM is usually <br /> followed by a permanent remediation system. <br /> Maximum Contaminant Level (MCL)--The maximum level at which a particular chemical <br /> is allowed to exist in public water supplies. MCLS are set in state and federal water laws and <br /> are derived from health, cost, and technological information. <br /> Monitoring Wells--Wells used for gaining access to groundwater at various locations so that <br /> the vertical and horizontal extent of groundwater contamination can be. .a55e55eJ <br /> QNWJ043.1(90380C)M9 19 M10o8920728 <br />