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Type II Work Plan - Addendum UXO Construction Activities and Soil Removal Action Preliminary Assessment/Site Investigation Update California Army National Guard Facility Stockton, California Contract No. GS-00E-007UTask Order W91238-05-F-0084 Version 2.0 SW8015M, C6 — C40), VOCs (SW8260B), semi-volatile organic compounds (SVOCs, SW8270), PCBs (SW8082) and CAM 17 metals. 2.3 BURIED WASTE EXCAVATION The buried waste removal action comprises the following tasks: Excavation of the identified geophysical anomaly and removal of up to 500 tons of buried waste and/or contaminated soil. Collection and laboratory analysis of confirmation samples. Disposal of the excavated soil at a landfill licensed to accept the waste. Backfilling the excavation with clean, imported fill. Compaction of the backfill. The following subsections detail the methods and procedures to be used to complete the above tasks. Figure 5 shows the expected extent of the excavation. The FSP addendum, included in Appendix C, describes the protocol to be used to collect, analyze, and document the confirmation sampling. 2.3.1 Site Preparation Site preparation activities will include; marking the site appropriately and notifying Underground Service Alert as required by law; notifying CA ARNG and CESPK personnel of the field activities and schedule, installing temporary fencing as necessary and mobilizing personnel and equipment to the Site. During the preconstruction meeting, Versar personnel will discuss access routes and storage areas with CA ARNG and CESPK personnel. Prior to excavation, exclusion and decontamination zones will be established and plastic sheeting will be placed in soil stockpile areas (as necessary). Section 11 of the WP includes the Soil Management Plan, Dust Control Plan, Spill Prevention Plan, and Stonnwater Management Plan to be followed during the response action. 2.3.2 Use of Equipment and Personnel The field tasks will be performed following the safety procedures described in the Accident Prevention Plan/Injury and Illness Prevention Plan and Site Safety and Health Plan included as Appendix B and C of the WP, respectively. Only trained, qualified, experienced personnel will be allowed to operate machinery or heavy equipment. The field crew will comprise a minimum of two personnel at all times. A Field Team Leader will also be present to supervise the field crew. 2.3.3 Excavation Strategy The excavation objective is to remove an estimated 500 tons of buried waste and/or contaminated soil from the area shown in Figure 5. The excavation strategy is to excavate and stockpile all soils with visible waste and/or detectable contamination, and collect confirmation samples. 104700.4965.300 Page 2-3 April 2007