SITE INFORMATION AND CORRESPONDENCE_2004-2014

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National Contingency Plan continued from page 3 Criteria for , Remedial Alternatives ROD-Required Response Actions at Soil Sites OOverall Protection of Human Health and the Environment Addresses whether a remedy provides adequate The contaminants of concern ON at soil sites include TCE(a protection of human health and the environment, volatile organic compound [VOC)) and metals specifically lead and describes how risks posed through each and chromium. exposure pathway are eliminated,reduced, or controlled through treatment,engineering controlyor institutional controls. The 1996 ROD requires cleaning up TCE contamination using SVE when concentrations of TCE in soil vapor exceed the cleanup level *-compliance with applicable or Relevant % - of 0.35 parts per million by volume(ppmv)and when vadose and Appropriate Requirements(ARARs) zone modeling predicts that residual contamination represents Addresses whether a remedy will meet all of the ARARs and federal and state environmental guidelines and/or a significant threat to groundwater quality. For soils with metals justifies an ARAR waiver. contamination,the ROD response action includes excavation and off-site disposal of soil with concentrations of dead above the © Long-Tenn Effectiveness and Permanence cleanup level of 1,000 milligrams per kilogram (mg/kg)or with Refers to the ability of a remedy to maintain concentrations of chromium above the cleanup level of reliable protection of human health and the C ENDAN environment overtime,once cleanup goals 300 mg/,kg.These cleanup levels were identified in the ROD as have been met. protective of human health and the environment if land use does this mean effectiveness of remains industrial. 10 Reduction o controls to protect H&E during the ThroughTre period between discovery and Summary of Site Risks Refers to completion of remediation treatmen tec. As part of the 1994 Remedial Investigation/Feasibility ation/Feasibili Stud mobility, nd installations? g tY Y compoun s present at the site. (RI/FS), DDJC-Sharpe conducted a risk assessment to determine the potential risks to human health and the environment by the cost-- _— COCs.A risk assessment is a scientific process that uses both Evaluat the estimated capital and operation _E� facts and assumptions to evaluate the potential adverse effects on and mai tenance costs for each alternative. ' human health and the environment from exposure to chemicals. 8 short-Term Effectiveness The risk assessment for DDJC-Sharpe indicated that lead-and Addresses the period of time needed to achieve chromium-contaminated soil sites require cleanup to reduce the protection and any adverse impacts on human a potential threat to human health.TCE in soil was determined not during the construction and implementation health and the environment that may be posed ,,, to represent a potential threat to human health; however,TCE- period,until cleanup goals are achieved. contaminated soils represented a threat to groundwater quality and therefore required cleanup. Q Implementahility � Refers to the technical and administrative feasibility DESJC began implementing the ROD-required cleanup actions of the remedy,including the availability of materials immediately.The cleanup activities have minimized potential and services needed to implement a particular option. impacts to human health and the environment and have also Sw Acceptwnce ---"-"-- - prevented further movement of contaminants from soil into Indicates whether the state favors or objects to any groundwater. In the cases where soil contamination exceeded the of the alternatives based on the available information, cleanup levels outlined in the ROD,cleanup measures were taken until the sites were deemed protective of human health and the 0 Community Acceptance r environment and,therefore, required NFA in accordance with the Indicates whether community concerns are addressed by ROD.These measures, in addition to the implementation of the the remedy and whether the community has a preference for proposed LUCs, help ensure that contaminated soil will not harm a remedy. human health or the environment. this comment should be deleted here. Such - statements would be more appropriate in a response 4 to comments document.