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LM, 1?407015 Crue0 par Nrre .,aw„ 71" 541 an, aar,a„ 2. Solvents 'nay have been used by the CoM Shops to remove machining or cutting oils and tatting oils historically contained PCBs. The RWQCB expressed concern that, although SVOCs and PCBs have never been delocted in Easman GSA ground water, if Mess mnstimene were associated with Me craft shop thimis buried n the trenches, they might impact ground water in Me future. The Its. EPA and the RWQCB indicated that May would not considerclosum of the Eastern GSA site until these data gala were closed. Therefore, DOFJNNSA agreed to collect additional subsurface and samples fmm the Eastern GSA debris burial trenches for SVOCJPAH and PCB analysis to determine if these Ceftsfintrents are present, and if present, m determine wlmMer or not the concentrations of them constituents could impact ground Waterhouse Maximum Contaminant Leveis (MCLm, IIn12014, DOEJLI.NL submitted a Work Plan for these charumrimtion activities that was approved by EPA, DISC, and Me RWQCB (Ferry m al., N14). In September 2014, the I .LNL Environmental Instamdon Department (ERD) conducted this work for the DOWNNSA in onmntu to with the approved Woh Plan and other existing procedures developed for LLNI;s going Site 300 assessment and aim cleanup under CERCLA. In Woman m the subsudace .mil sampling refused by EPA not the RWQCB, DGE/LI NL aim collected gushed water samples from wells in the Eastern GSA debris burial (tench area and atelyeed Mem for SVOfS. Following Completion of tht additional characmriaation activities, DOEJLLNL submitted a 3'echniral Memommluan Men described the activities and results of the chamcmrimtion of SVOC/FAG, amd PCBs in subsurface soil in the Eastman GSA debris burial trenches area on January 15, 2016. On March 3,2016(RWQCB),April 5,2016 (DTSQad July 26,W16(EPA), Me regulatory agencies approved the 'I'malical Memorandum, and concuned that investigation of SVOCwTAHs and N'th in subokabov soil in the Easmrn GSA debris burial acrobat met was complete, and no further action for these constituents was needed. The Technical Memorandum is included in this 'upon as Appendix A. This Close O o Report cnnstitmes the documentation that conciliation of the Eastern GSA Subarea of the GSA OU has been completed. 2.2. Removal Actions Prior to the signing of Me GSA ROD in 1992, removal actions and related activities in the hasten GSA included: Ground water extraction and treatment which was initialed in the Eastern GSA in 1991 an begin rcmediation VOCs served Rome Me debris burial trenches to ground water. • Moaned no Ofonsite and oRsk ground water to evaluate the effectiveness of Me removal action in reducing VOC concentration; in Eastern GSA ground aster, and to track Va: Plume migration that could potentially impel offsite water-supply wells. • The non-time critical ground water extraction and treatment and monitoring removal action to remove TCE and Other VOCs in the Eamem GSA continued as a remedial action after the GSA ROD was signed in 1997, as discussed in Section 2.4. 2.3. Remedial Invesflgation/Feasibflity Study DOE began environmental investigations in the GSA in 19112. Review of historical records and photographs and inhrv'ews with present, former, and refired LLNI. employees wee