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L.,.NL.Aa607015 lrro, erm� Eavern:NJs,� „as ny,a In Febromy2012, EPA,DTSC, and Me R WQCB concurred that the Easlem GSA ground water dam indicated that: (1) cleanup standards had been met for Eastern GSA ground water, and (2) VOC cnncentrasions bad remained below the cleanup standards for five years. 8.3. Instilutional/l.and Use Controls As part of the mumdUn on completion evaluation, DOE reviewed the GSA Inxtitutional/land Use Confkc with respect W the Eastern GSA (Table 2). V W concentrations in Eastern GSA max and olTsim) ground water have been reduced he set drinking water MCU (cleanup standards). WE has monitored otfsim private water supply wells CDFI and CONI, favored downgmdiem of the Eastern GSA, since the I980s. VOCs have ever been rehearsed above analytical repotting limits in well CONE. While WIF was detected in two samples collected from well CD111 in 1992 (0.3 Run ) and 1995 (0.6 pg/L [duplicate sample containce1 <15lig/1 ICE]), WE concentrations were well below the 5 pg/L drinking water MCL and have been below the analytical reporting limit since 1995. "1 herefsm, instisutionaVland use controls are no longer needed far the Eastern GSA to prevent wamr-supply use or consumption of contaminated ground water. The GSA baseline risk assessment determined that there was no unacceptable risk or banned associated with surface orsnbsurfnce soil in the Eastern GSA. In addition, roe maximum historical WE concentration detected in soil/rock in the Fastere GSA (0.024 mg/kg) is also below both the residential and industrial Regional Screening Levels (May 2016)that ave incorporated she revised (2011) ME toxicity value. Therefore, imlitutiocoEmnd use combos are not necessary he prevent exposure to VOCs in surface and subsurface sail in the Eastern GSA. The institutional control 10 maintain engimeving contends W prevent site worker inhalation exposure he VOCs inside Building 875 does net apply to the Eastern GSA because Building 875 is located in tine Central GSA. As discussed in Section 2.3, WE mevaluated TCE in subsurface soil in the Eastern GSA using me revised ME toxicity value that EPA adopted in September 2011. The ME concentration volatilizing from subsurface soil thal was calculated for Outdoor air in the Eastern GSA was 0.02 pg/ml. This concentration is below both Me residential and industrial exposure air concentrations considered to be protective at a I Or cancer risk level and for non- cancer effect; calculated using Me revised September 2011 WE toxicity value. Site dam indicate that ground water remediation at she Eastern GSA has been completed and that residual chemical contaminants of concern that are present in ground water do not pose can nepm th blc risk to human health or e environment Data derived from soil investigations conducted at the Easem GSA also indicate that residual chemical contaminants urcoacern present in suit do not pose an unacceptable risk to human health and Elie environment, or pose a Meant in ground water quality. Therefore, no hither action is required at the Eastern GSA. In accordance with applicable requirements of Me California Cade of Regulations Title 27, Section 21170, DOE will record a notation on the deed to the Site 300 property with the County Recorder, or some other legal inslmmenl, to provide notification to potential puncturers, lessee, or sublessee that land at the Eastern GSA was used as a disposal area, contains buried waste (scrap metal, lathe turnings, porcelain shards, electrical wine, assorted metal pipes, and glass), and was the source of VW contamination in ground water.