SITE INFORMATION AND CORRESPONDENCE

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continued from page Figure National Contingency After DDJC-Tracy and the regulatory agencies reviewed and incorporated public comments on Criteria for t the Proposed Plan,DDJC-Tracy prepared the Remedial vesSitewide Comprehensive ROD. This ROD described the selected remedial activities that O Overall Protection of Human Health and the Environment DDJC-Tracy would undertake at each of the 20 sites. The regulatory agencies(EPA, Addresses whether a remedy provides adequate DTSC and RWQCB)reviewed and approved protection of human health and the environment, and describes how risks posed through each the ROD,and It was signed in April 1998. exposure pathway are eliminated,reduced, Since that time,DDJC-Tracy has been using or controlled through treatment,engineering the ROD to guide its environmental program. controls,or institutional controls. The Sitewide Comprehensive ROD required © Compliance with Applicable or Relevant DDJC-Tracy to conduct certain additional and Appropriate Requirements A. investigations. As a result of these additional Addresses whether a remedy will meet all of the ARARs and federal studies,DDJC-Tracy now has more information sand state environmental guidelines and/orjustifies an ARAB waiver. than was available when the ROD was signed © Long-Term Effectiveness and Permanence in 1998. This new information has led to a better understanding of site conditions,and DDJC-Tracy Refers to the ability of a remedy to maintain is recommending some new remedial actions that reliable protection of human health and the "MOMMOM differ from the actions listed in the ROD. For this environment over time,once cleanup goals have been met. reason,a ROD amendment is required. OReduction of ToAclty,Mobility,and Volume The Draft Final Amendment to the Sitewide Through Treatment Comprehensive Record of Decision(referred to hereafter as the ROD Amendment)was published Refers tothe anticipated ability of the treatment technologies to reduce the toxicity,mobility,and _ in November 2001.(The ROD Amendment will be volume(TMV)of the hazardous compounds �j._ published as a final document after comments have present at the site. been received from the public.)This new document explains what has been learned since the Sitewide Comprehensive ROD(referred to hereafter as the © Cost Evaluates the estimated capital and operation and _ original ROD)was published,and it recommends maintenance(O&M)costs for each alternative. new remedial actions to be taken as a result of the new information. 0 Short-Term Effectiveness The following sections provide details about three Addresses the period of time needed to achieve protection and any adverse impacts on human health �,,,a-�., sites that were affected by the new information, and the environment that may be posed during and about the criteria that were used to develop the constmction and implementation period, '�''' p p M•,..� recommendations for new remedial action until cleanup goals are achieved. —' alternatives at these three sites. O Implementability Figure 4 shows the location of all of the remedial action sites at DDJC-Tracy. The figure highlights Refers to the technical and administrative feasibility two of the sites addressed in the ROD Amendment of the remedy,including the availability of materials and services needed to implement a particular option. (shown in the figure as SWMU 4 and DSERTS 72). The groundwater treatment system shown in Figure 4 is part of the cleanup remedy for the third site addressed in the ROD Amendment. This third site,known as Operable Unit 1,consists of the 0 State Acceptance contaminated groundwater beneath DDJC-Tracy. Indicates whether the state favors or objects to any - of the alternatives based on the available information. i'uxsu 0 Community Acceptance Indicates whether community concerns are addressed by the remedy and whether the community has a preference for a remedy.Although public comment is an important part of the final decision,DLA must balance community concerns with all the previously mentioned criteria. 4