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' � 1 GAL Aft 601 : «tole,G�:e ommosAma tt'evis Xmial Tmacm,am w zeta Step 3: Identify Information Inputs: Subsurface and samples wllected from boreholes and analned par SVOC/PAHs and PCBs. Step 4: refine Study Boundaries: Historical information, including an air photo while the burial trenches wave active, and tea pit chamderiaation and excavation in 1990 provided adegwte spatial definition of the bench locations. Step 5: Develop Analytical Approach and Decision Analysis: If and sample SVOC/PAH and/or PCB results me below analytical method reporting limits then no Ibrher name is ssary. If any SVOCWAHs wd/or PCBs are detected, then further assessments W evaluate risk to human health and threat to ground water will be conducted. Step 6: Specify Performance or Acceptance Criteria: "I'he analytical performance crimson arc based on the analytical method reporting limits (RLs) compared to individual compound FTA Regional Screening Levelsl5oil Screening Levels (RSLaSSI.sL Step y: Develop plan for Obtaining Data: "I'he plan for obtaining data was spcedied in the Paaern GSA Debris Burial Touch WOh Plan (Aug, 2014). Additional information regarding QA/qudity Central (QC) procedures and QC samples is included in Section 3.5. 2, Site Background The following sections provide descriptions of the sayring and the geology and hydrescology, and summarize investigations and reme actions ac ssconducted in the Eastern GSA prior 10 implementation of the sampling effort for SVOC&PAHs and PCHs in the debris burial bench area. Additional information can be fund in the Site-Wide Remdial Investigation (Webster Schubert, 1994), GSA Feasibility Study Butech and Berry, 1995), GSA Record of Decision (ROD) (U.S. DOH, 1997), GSA Remedial Design (Rudh et a1., 1998), GSA Five-You Reviews (Ferry d al., 2001, Dibley et alp 2006, and Valett d al., 2011), file Draft Final Close Out Repeat for the B tern GSA Subarea (Dibley and Ferry, 2013), and the Chamderi ation Work plan for Subsurface Soil in the Eastern GSA Debris Burial Trenches (Ferry or al., 2014). 2.f. SitencompHrn LLNL Site 300 is a U.S. DOE caperimen al test facility operated by the Lawrence Livermore National Security B.LNSL Limited Liability Conformation. Site 300 is approximately I I square miles and located in the Eastern Almmont Hills, I'Imiles cast of Livermore, California (Figure 1). At Site 300, DOE conducts research, development, and testing associated with high<zplosive materials. During previous Site 300 operations, a number of contaminants were released to the eavironment. The GSA OU is Insured m the southeast corner of Sitc 3d0 (Figure IL "the GSA has been separated into the Central GSA and the Bashers GSA based On differences in hydmgwlogy add the distribution of environmental contaminants (Figure 2). Only the EaAa m GSA portion of the OU is relevant to and is discussed in this Technical Memorandum. '16e Pasteur GSA area is largely undeveloped. Steel within tile Central GSA, m GSA include 'a pond that is used to treat sewage generated by shops and offices n the 3