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LIN,,AR-580188 7ech MV.mft"' eaa.ere ea on fs„bcnl� soil in de AlorU2016 322. Ground Water Sampling following the detmdion of low concentrations of PCBs in some soil samples collected film the bomholes, DOE/LLNL collected gmund water samples fir laboratory analysis for PCBs (EPA Method 80g2A) him nine nearby monitor wells. These wogs included: • W-26R-01, -04, and -06 and W-25N-24, Sampled on December 3, 2014, W-26N-0'/ and -Hand W-TP, sampled on Dewmber 4, 2014, and • W-25N-01 and W-26R-03 sampled on December 8, 2014. An attempt to sample well W-26R-05 on December 3, M14 was unsuccessful due to msuficienl water. All the wells am located in the vicinity of the fallen OSA debris burial trenches, with the exception Orwell W-]P. This well is located in the vicinity of debris burial trench g3, located in the Central GSA. The sampling of wall W-yP was sampled to determine if PCBs may have been released to ground water from this Central OSA debris burial humcM1. Ground water samples were collected in accordance with LLNL ERD SOP 2.3 and 2.4 (Sampling Monitor Wells with Bladder Pumps, Electrical Submersible Pumps and Specific- Depth Gmb Sampling Devices and Sampling Monitor Wells with a Bailer). All samples were collected in I-liter amber glass bottles that were marked and labeled (location, date/time, emJ and capped for laboratory analysis. I Ipon collection, the samples were placed in an ice chest to maintain the required V C temperature. At the end of curb day, the he chests containing samples collected that day and accompanying ch tin. f-custody documentation were transferred ill a of for transport to the BE Lubomtones (Bakersfield CA). Sample control and documentation were conducted in accordance with the prossal described in Appendix A of me Work Plan (Pmry d aL, 2014). Analytical sample chains.,fcomedy and the analytical mnple illegally logbooks were handled recording to I.I.NL SOP 4.2 (Goodrich and Lorena, 2012). Samples firm these, nine wells along with a QA/QC duplicate sample were arely7sx] for PCBS using EPA Method gOb2A. The PCB analytic results tot the routine and duplicate QC ground water samples are discussed in Section 4. 3.3. Contamination Control and Sampling Equipment Decontamination Procedures Contamination control procedures, outlined in laboratory specific IWSs, were followed to prevent contamination of facilities and persmmeL To control potential contamination, auger Wings were placed on plastic sheeting adjacent to the borehole during drilling and sampling activities. These soil cuttings were placed back in the borehole at tlhe conclusion ofall borehole ,sampling. Drilling equipmengLe., auger Bights) and sampling equipment was decontaminated prior to each borehole following guidance provided in ERD SOP 4.5: formal Equipment Decontammafion: Sampling equipment decontamination (Goodrich and Lorega, 2012). As specified in SOP 4.5, this was done by mechanically removing all soil on the enact Bights or sloughing equipment to me same plastic shecting that contained the drill cuttings. After the aril removed,was the auger }lights and Bider equipment sees rinsed using potable Water from onsite water-supply Well 20. Routine monthly sampling or Well 20 water c0nftrmea that water firm