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1.0 INTRODUCTION PRC Environmental Management, Inc. (PRC) received Contract Task Order (CTO) 0066 from the Department of Navy, Western Division, Naval Facilities Engineering Command (WESTDIV) to develop documents required for removal actions at the Naval Communication Station (NAVCOMMSTA), Stockton, California. PRC's Comprehensive Long-Term Environmental Action Navy (CLEAN) contract team member, James M. Montgomery, Consulting Engineers, Inc. (JMM), will have primary responsibility for developing the Plans of Action and Milestone(POAM), the Engineering Evaluation/Cost Analysis (EE/CA), and plans and specifications to effectively direct the technical work throughout the removal activities. PRC will provide project management support and technical oversight. This report presents the final EE/CA for removal actions to be carried out at Site 5 of the NAVCOMMSTA at Stockton, California. The Naval Communication Station is located on Rough and Ready Island along the western boundary of the city of Stockton, California. Rough and Ready Island was originally a marshy grassland and swamp along the San Joaquin River. The island was first settled around 1850 and was reclaimed through construction of dikes and interior drainages to prevent flooding. After reclamation, the island was planted with fruit orchards. The first military installation on the island was an Army camp built after World War I to rehabilitate wounded war veterans. During World War II, the island was developed as a major supply depot for Pacific offensives. On June 30, 1945, it was commissioned to the U.S. Naval Supply Annex, Stockton. The end of the Korean Conflict brought a gradual decline in the activities of the Supply Annex. The NAVCOMMSTA moved its headquarters to the island in 1960. In 1965, the Supply Annex was deactivated and control of the island was assigned to the NAVCOMMSTA. A site investigation(SI) for Installation Restoration (IR) Site 5 (PCB and pesticides Areas A through J) was conducted by ERM-West in 1989 to determine if past waste handling and disposal practices had contaminated the soil and ground water in the vicinity of these sites. The SI report (ERM-West, 1989) determined that Areas A (sump only), C, and J could be remediated immediately without further study and with limited work effort in order to prevent any potential contamination to the surrounding environment. Task order 0066 established the nature of removal actions in Areas A (sump only), C, and J, as an interim measure before a larger removal action is conducted involving all Areas (A through J) at Site 5. CTO 66 therefore incorporates removal of sumps and pit contents in Areas A, C, and J, followed by the demolition/abandonment/reuse of these sumps and pit. The work plan presented in this EE/CA, therefore, does not address remediation and excavation of any contaminated soils surrounding the sumps and pit in the three areas. Removal actions for other IR Site 5 1