WORK PLANS - Laserfiche WebLink

Home Browse Search

� 1 UNL-AR-00188 core Wpwjs -Cascara„saran wsnnn,f,.xaffinMar ApH12016 1. Introduction I.I. Purpose This 'Technical Mennommdu n describes the activities and results of the characterization of scativolatile organic compounds (SVUCsypolycyclic a c hydrocarbons (PAlls) and polychlorinated hiphenyls (PCBs) in subsurface soil in the vicinity of the debris burial trenches In the Eastern General Services Area (GSA) portion or the GSA Operable Unit (Olt 1) at Lawrence Livermore National Laboratory U.LNL) Site 300. The locations of Site 300 and the GSA OU am shown in Figure 1 . In June 2013, the U.S. Department of EmergyMational Nuclear Security Administration (DOENNSA) submitted the "Daft Final Close Gut Report far the Eastern GSA Subarea of OU 1" (Dibley and Ferry, 2013) to document completion of romdiation. At the July 18, 2013 Remedial Project Managed s (RPM) Moring, the U.S. Environmental confection Agency (EPA) and the California Regional Water Quality Control Board U WQCB) indicated that they left that there were data gaps for SVOCSIPAHs and PCBs in subsurface soil in the vicinity of the debris burial trenches that needed to he addressed. The EPA indicated that the lack of sampling for SVOCVPAHs and PCBs in subsurface soil during fire mmnflati0n investigation of the debris burial mcmhes indicated a data gap because: 1. The EPA Guidance for conducting Remedial Investigations and Feasibility Studies for Landfills indicates that analyses should be taken from Re recent Compound List and Target Acolyte List, which include SVOCs and PAITS 2. Solvents may have been used by the ernes shops to remove machining or cutting oils and cutting oils historically contained PCBs. The RWQCB expressed concern that, although SVUCs and PCBs have never been detected in Eas1em GSA ground water, if these constituents were associated with the craft shop debris buried to the touches, they might impact ground water in the future. The U.S. EPA and tie RWQCB indicated that they would not consider closure of the Easter GSA site until these data gaps were closed. Therefore, DOE/NNSA agreed to collect additional subsurface soil samples from the Eastern GSA debris burial trenches for SVOC/PAII and PCB analysis to determine if these constituents am present, and it present, to deastr ine whether or not the concentrations of these cons imena could impact ground water above Maximum Contaminant Levels (MCIs). A Work Plan for these chamc[erimtion activities van submitted and approved by the U.S. EPA, California Department of Toxic Substances Control (DISC), and the RWQCB — Central Valley Region (Ferry et al., 2014). In September 2014, the LLNL Environmental Restoration Department (ERE) conducted this wade for the OOPJ SA in accordance with the approved Work Plan and other existing procedures developed for LLNL's ongoing Site 300 assessment and site cleanup under the Comprehensive Environmental Response, Compensation, and liability Act (CERCLA).