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LLN1,41?-m7015 °vrfwI& fsWo ,w, ,, eam 1. Introduction 'Ills Close Out Repom docmmanm that the United stales (U.S.) Department or Energy (DOE) has completed all remedial actions in the Fantem Cenend Services Also (GSA) .Subarea of Operable Unit (Olt) 1 of the Lawrence Livermore National Laboratory (I.I,NL) Site 300 (U.S. LnvimnmenWl Protection Agency [EPA] Superfand Site Identification No. CA 289009000), as agreed to in the GSA Reco d of recision (ROD) (U.S. DOE, 1997). This Close Out Report was prepared in accordance with Close Out Proredol for NalioncelPriorities Sues (U.S. EPA, 2011), Although this EPA guidance is milored to the completion ofremMial actions at an entire National Priorities List (NET) site (i.e., LLNL Site 300 [Otis 1 — 9]) DOE utilizes EPA's completion criteria and this Clove Out Report to document that the Pastern GSA Subarea U OFthe GSA O I has met these criteria, and that remwliation is complete for this subarea. The GSA Oil is divided into two subareas, We Central GSA and Eastern GSA, based an differences contaminant source aras e , hydmlmOlogy, and the distribution of envrmnmental ern or n. because cleanup completion has only heel achieved in the Eastern GSA portion Of the GSA OU, this Close Out Report discusses only the Eastern GSA Subarea of the OU. Ongoing remediatian efforts in the Cenral GSA and offer OUs or Sift 300 are presented in the semi-annual Compliance Monitoring Reports and Five-Year Reviews. 2. Summary of Site Conditions 2.1. Site Background LLNL SiW300 is a DOE experimental test facility operated by the Lawrence Livermore National Security, limited Liability Corporation. 'Ile facility is located in the eastern Allmon tills about 17 miles Bust of Livermore and 8.5 'Riles southwest of downtown 'I'rary (Figure I). The site covers I I squaw miles, most of which is in San Joaquin County. The western onexic h of the site is located in Alameda County. Site 300 is primarily a high<xpmsives test facility supporting the LLNL weapons pmgmm in rowarch, developm sq, and testing associated will weapon components. Operations at Site 300 began in 1955 and include four defrnse program activities: (I) hydrodynamic lesting, (2) charged particle beam mseurch, LO physical, envlmnmentah and dynamic tasting, and (4) High Explosive (HE) formulation and Fabrication. No actual fissionable material is used in these hydrodynamic tests. Fencing and full-time security guards reslfict access ill Site 300. During past LLNL Sift JOE operalions, a number of contaminants were released to the rat Ihmughout Site 300. Site 300 was placed on the NPL in Augosl 1990. Since Wn,o allvInvestigations have been conducted in accordance with Comprehensive Environmental Response Compensation, and Liability Act of 1980 (CHI CLA) under the oversight arrive three regulatory agencies: EPA, the State of California Department of Toxic Substances Control (DTSCL and the Regional Water Quality Commit load Central Valley Region (It WQCBL LLNL Site 300 has been divided into nine OUs based oil the nature and extent ofconscrindion to effectively manage site cleanup. "Ile GSA OU I is located in the southeast comer Of Site had (Figure ). As discussed in Section I, the GSA has been separated Into We Central GSA and the