SITE INFORMATION AND CORRESPONDENCE_2005-2014

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National I r Plan continued from ,.,e Criteria for r Remedial Alternatives ROU-Required Response Actions at Soil Sites OOverall Protection of Human Health and the Environment Addresses whether a remedy provides adequate The contaminants of concern(CM)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 controls,or institutional controls. — The 1996 ROD requires cleaning up TCE contamination using SVE when concentrations of TCE in soil vapor exceed the cleanup level 0 compliance with applicable is Relevant r-�� of 0.35 parts per million by volume(ppmv)and when vadose and Appropriate Requirements meet all `"� zone modeling predicts that residual contamination represents Addresses whether a remedy will meet all of the and/oARARr a significant threat to groundwater quality. For soils with metals and federal and state environmental guidelines and/or justifies an ARAB waiver contamination,the ROD response action includes excavation - and off-site disposal of soil with concentrations of lead above the © Long-Term 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 CALENCM 300 mg/kg.These cleanup levels were identified in the ROD as environment over time,once cleanup goals have been met. Protective of human health and the environment if land use does this mean effectiveness of remains industrial. Q Reduction o controls to protect H&E during the Through Tre:period between discovery and Summary of Site Risks Refers to completion of remediation treatmen tec installations? As part of the 1994 Remedial Investigation/Feasibility Study mobility, nd (RI/FS), DDJC-Share conducted a risk assessment to determine compoun s present at the site. P the potential risks to human health and the environment by the 40 cos __ r— COCs.A risk assessment is a scientific process that uses both Evaluat the estimated capital and operation z 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. 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 potential threat to human health.TCE in soil was determined not health and the environment That may be posed e,. during the construction and implementation 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 Q Implementabiltherefore required cleanup. ity Refers to the technical and administrative feasibility DESK 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 8 State acceptance - 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 unfit the sites were deemed protective of human health and the Q Community acceptanceenvironment 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,WWal human health or the environment. W4 all of t1:8 PP@VIQWSIY P4@AIiQ;;Gd'40i:ia this comment should be deleted here. Such ^^^ statements would be more appropriate in a response 4 to comments document.