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0 • Michael Work law that, while not "applicable" to a hazardous Remedial Project Manager (H-9-1) substance, pollutant, contaminant, remedial ac- U.S. Environmental Protection Agency tion,location,or other circumstance at aCERCLA 75 Hawthorne Street site, address problems or situations sufficiently San Francisco, CA 94105-3901 similar to those encountered at the CERCLA site Phone: (415) 744-2392 that their use is well suited to the particular site. Camilla Williams Aquifer--Bedrock or sediments below the Engineering Geologist ground surface that are saturated with groundwa- California Environmental Protection ter. Agency - Regional Water Quality Control Board Aquifer Cleanup Levels--Compliance stan- 3443 Routier Road, Suite A dards for cleanup of groundwater including risk- Sacramento, CA 95827-3098 based action levels and applicable or relevant and Phone: (916) 255-3069 appropriate requirements. These concentrations are the levels to which the aquifer must be restored Jim Pinasco through remediation. Waste Management Engineer California Environmental Protection Agency Comprehensive Environmental Response, Department of Toxic Substance Control Compensation,and Liability Act(CERCLA)-- 10151 Croydon Way A federal law passed in 1980 and modified in 1986 Sacramento, CA 95827-3098 by the Superfund Amendments and Reauthorization Phone: (916) 255-3719 Act(SARA). The act created a trust fund,known as Superfund, to investigate and clean up aban- GLOSSARY OF TERMS doned or uncontrolled hazardous waste sites. Fig- ure 1 is a graphic that answers the question, "What Administrative Record--This is the body of is Superfund?". The act requires the Defense documents that forms the basis for the selection of Logistics Agency to reach agreement with the EPA a particular response at a site. Documents which for remedial action at DDRW-Tracy and to per- are included are relevant documents that were form the remedial action. relied upon in selecting the response action,as well as relevant documents that were considered but DTSC--Department of Toxic Substances ultimately not used. Control, California Environmental Protection Agency. Applicable or Relevant and Appropriate Requirements (ARARs)--Applicable require- Groundwater--Water found beneath the merits are those cleanup standards, standards of earth's surface that fills pores between soil and control, and other substantive environmental pro- gravel particles to the point of saturation. Ground- tection requirements, criteria, or limitations pro- water often flows more slowly than surface water. mulgated under federal or state law that specifi- Groundwater is the source of 80 percent of the cally address a hazardous substance, pollutant, United States' water supply. contaminant, remedial action, location, or other circumstance at a CERCLA site. Relevant and Interim Remedial Measure(IRM)--An ac- appropriate requirements are those cleanup stan- tion which is designed to prevent immediate health dards, standards of control, and other substantive orenvironmental risk by exposure to contaminated environmental protection requirements, criteria, media. The IRM is usually followed by a perma- or limitations promulgated under federal or state nent remediation system. 9