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�L Aft�a,ar Tees Ao ,jnn i'..rvke:a, Lsmimo v'Soff„r, a 2016 1.2. Project Objectives and Work scope summary The objective of the additional characterization a o determine: (I) if SVOCvPAHs and PCBs were present in subsurfae soil ithe tEastern GSA debris burial trench and (2) if present, the "mile[ for these constituents to pose an unacceptable health risk or to impact ground water at concentrations above MCLs. The activities that were conducted to achieve this objective included: • Drilling 13 boreholes to a depth of 15 ket (it) below gmand surface (has) or to auger refual within the Eastern GSA debris burial Trench area. • Collecting subsurface mil samples from each borehole for SVOC/PAH and K'B analyses. • Evaluating any SVOCssPAI Is or PCBs detected in subsurface soil relative to regulatory seasoning levels, and if necessary, assess the risk and potential threat to ground water using site-specific data. Tho details of these activities and the methods that were used to conduct dam are discussed in Section 3. 'Me analytical results for subsurface soil and ground water samples collected as pert ofthis effort am discussed in Section 4, 1.3. Data Quality Objectives The EPA's Data Quality Objectives (DQOs) Prorzss is a series of seven logical steps than guides planners to line resource-effeenive acquisition m envirmunenml dam. The GOO process is used in establish performance and acceptance criteria, which serve as the basis for designing a plan for collecting data of sufficient quality and quantity to support the Soaps of the study. Use of the DQO process leads to efficient and c1 bcthw expenditure of resources: consensus on the type, quality, and quantity of data needed to meet the project goals; and appropriate documentation of actions taken during the development of the project LLNL ERD conducts its work pjects in accordance with the approved Quality Assurance Pject Plan (QAPP) (Dibley, 1999) requirements for plarming, performing, documenting, and verifying the quality of activities and data. The QAPP was prepared for CERCLA compliance and en crow that the Precision, accuracy, completeness, and represrnlatiomens of project dam are known and are of acceptable quality. 'I he QAPP is used in conjunction with the LLNL ORD Slandard Operating Roceshass (SOPs), Work Plans, Integration Work Sheets (IWSs), Site Safety Plans, and any other applicable Environmental Safety and Wells (Y.S&H) and/or quality assurance (QA) documentation. Additionally, for the in esligatioa described in the Work Pon, the EPA guidance "Systematic Planning Using the DUO Process" (EPA, 2kad was followed. 'Pine DQO slops identified in Table I of the Work Plan for the Eastern GSA Debris Burial Trench characterization activities were as follows: Step 1: Slam the Problem: q'o meet the requirements for Site Clomm, a data gap manacling SVOCVRAH& and Mon in soil and groundwater in the Eastern GSA debris burial [reach needs in be filled. Step 2: Identify Study Goal: Fi11 the date gap. Ir SVOCMAn and/or PCBs are not present, then no further work Is required. Wiley are Present, then number assessment will Ist necessary.