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yrv,..KA8018a m r�a�.« "n �e.<ne,., .s�,�in go .,, Y2016 In 1995, a Feasibility Study forte GSA OU that evaluated remedial alternatives f cleanup s souse. A Proposed Plan for E:nvimnmental Cleanup ofthe GSA Oil was issued in 1996 f she public as review and commend on the remedial alternatives and proposed cleanup remedy and standards (DOE, 1996). 2.4. Remedial Actions To Date forced water extraction and usua ern in the Eastern GSA to remove TCE and other VOCs began as a non-time-critical removal action in 1991 and cantitrust As a remedial action alter the G.SA ROD was signed in 199y. In addilinn W ground waterextmgion and treatment, monitoring of ground endorsers conducted to evaluate the of nctiesses nfine remedy in achieving cleanup .standards, and to ensure there is no impact to downgradieat wamosupply wells. The treatment facility influent and effluent were monitored to ensure compliance with the treatment facility efaaent discharge limits. The effluent receiving surface water in Coma Hollow Crock was also monitored to evaluate potential surface water quality impacts. figure ] presents a site map of the Pearson GSA portion of the GSA OU 1 showing become, extraction, and water supply wells, act the former ground water extraction and treatment facility. A Risk and flaca d Management Program, including ins6mtionaVland use argueds, was also implemented to prevent human exposure to contamination and to protect the integrity of the reedy. As discussed in Section 23, the only unacceptable risk identified in the baseline human health risk assessment for the Eastern GSA was assembled with The potential ingestion of Wound water condensing VGCs at concentrations exceeding MCLs (cleanup standards). Because the NICL cleanup Mangers am protective under a residential and unrestricted land use, the only institutional/land use control that was applicable m the Eastern GSA was represent water-supply use/Ommumption ofconmminated Wound water until ground water cleanup smndamis were red. By July of 2005, the concentrations of all individual VOC COCs had been reduced to below their ground water cleanup smndaras in all Eastern GSA wells. In February 20l the Eastern GSA ground tatter eMmction and treatment system was shut down and placed on standby with regulatory concurrence. VOC w n Wound w monitored from February. I T m1 91February20 2012 over verify imf gallosoconcentrations dice not SA Soared above r.cleanup were standards prom 1991 m 20oJ, over Jql million gallons of Eastern GSA ground water were extracted and lreared. 3. Characterization Activities and Methods As discussed in Section 1.2, the objective of the activities described in this section was to determine if SVOCmPARs and PCBs are present in subsurface soil in the Eastern GSA debris bmial trenches, and if an, whether co of these c could pose an unacceptable risk or impact Wound water above MCIs This section describes Borehole drilling conducted to collect the required soil samples, including any deviations from the Work Plan made during drilling (Section 3.1), • Soil and ground water sampling methods including any deviations from the Work Plan made during field sampling (Section 3.2), • Contaminant con[ml and sampling equipment decontamination procedures (Section 3.3), 8