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Background of the 1)Protect people,plants,and animals from were developed in accordance with the Environmental Documents coming into contact with contamination; National Contingency Plan's(NCP)criteria Under Consideration 2)Protect groundwater for beneficial uses; for evaluating remedial alternatives.Figure 3 and (page 4)shows the NCP criteria used to help In 1998,DDJC-Tracy published 3)Comply with applicable or relevant and select the cleanup remedies for the sites. a document called the Sitewide appropriate requirements(ARARs), Comprehensive Record of Decision such as state and federal environmental The alternatives recommended in the FS (ROD). This ROD was published compliance statutes and requirements. were summarized in a Proposed Plan,which following the completion of a number was called the Proposed Plan for 7Wenty Sites. of environmental studies,including These objectives assure that any remedial This Proposed Plan was released to the public a Remedial Investigation/Feasibility actions undertaken at DDJC-Tracy meet the for comment in January 1997,and a public Study(RDFS). overall objective of protecting human health meeting to discuss the Proposed Plan was and the environment. held on March 6, 1997. The plan described The RDFS established three primary recommended remedies,provided information objectives for the environmental study The RI identified 20 sites at DDJC-Tracy to the public about the actions planned at the and cleanup program at DDJC-Tracy: where remedial actions needed to take place, sites,and encouraged public input. Public and the FS evaluated the different remedial input is required before final decisions can alternatives that could be used at these sites. be made on cleanup alternatives. The FS also recommended preferred remedial alternatives for each site.These alternatives continued on page 4 Figure r II RPL Ranking IRM OU 1 I Final OU t Proposed Plan and Listing Implemented Identification IRecord of for Twenty In August 1990, Due to movement Operable Unit 1 Decision Sites EPA listed DDJC- of the VOCs in (OUI)was (ROD) Cleanup ROD Amendment Tracy on the groundwater,an identified in 1992 alternatives National Priorities Interim Remedial and consists of A ROD signed recommended Draft amendments List of hazardous Measure IRM contaminated in August 1993 to the Sitewide (IRM) in the FS were Comprehensivesummarized edROD waste sites. was implemented groundwater defined the to contain the emanatingfrom cleanup remedy summarized in are summarized in for the OU 1 the Proposed this Proposed Plan. spread of VOC- DDJC-Tracy. Plan for Twenty The ROD Amend- contaminated groundwater Sites,which was groundwater. plume. ment will be presented to finalized after This system was the public for receipt of public constructed in comment in 1991 to extract January 1997. comments. and treat VOC- contaminated Remedial EE/CA groundwater. Investigation/ Sitewide Long-Term An Engineering Comprehensive g Feasibiliiy Evaluation/Cost ROD ehensive Cleanup Study (RI/FS) Analysis The selected Well FFA Signed hroaseon RI activities (EE/CA) Based remedies will be designed, Monitoring for Solid Waste - comments A Federal began in hro Management Program facilities continued through gement received on the implemented,and rn May 1991, Agreement(FFA) June 1995.These Units(SWMU) F Proposed Plan for monitored to ensure a well monitoring was negotiated activities served to 2,3,and re Twenty Sites,a effectiveness. program was in June 1991 characterize the was prepared Sitewide established and included a nature and extent in early 1996. Comprehensive This EE/CA ROD was signed to monitor schedule for of contamination movement of cleanup activities. at the various sites. evaluated by ,DTSCDDJC-Tracy,and cleanup EPA,DISC volatile organic Parties to the FFA An FS followed the compounds included DDJC- investigations and alternatives in April 1998. This (VOCs)in Tracy, EPA, identified possible for the sites. 1998. s groundwater. DTSC,and the cleanup alternatives document selected J Central Valley and remedies. cleanup remedies RWOCB. for each site. 3