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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 Confirmation samples will be collected from the sidewalls and bottom of the soil excavation. Sample collection will be performed at a rate of one sample per 20 linear feet of sidewall with a minimum of one sample per sidewall, and one sample per 100 square feet of excavation bottom. Confirmation sample results will be compared to California Regional Water Quality Control Board — San Francisco Region Environmental Screening Levels (ESLs), which comprise the excavation objectives for the Site. The excavation will remain open, with temporary fencing, until laboratory analysis confirms the objectives have been met. A mobile laboratory may be utilized to provide rapid turnaround laboratory analysis. If one or more samples are found to exceed an objective, additional excavation Will be performed and additional samples collected. Following completion of the removal action, the excavation will be backfilled with suitable clean material from a local source. Only backfill that has been tested and certified as clean will be used. CVRWQCB staff will be provided with sources and certifications prior to initiating excavation operations. The backfill will be compacted during installation and the near-surface material tested to verify 95 percent of maximum dry density compaction has been achieved. 2.3.4 Stockpile Management The soil will be pre-characterized and accepted at a landfill licensed to accept the waste prior to excavation (following the protocol described in Section 2.2 and Appendix C), and stockpiling may not be required. Soils will then be excavated and placed directly on trucks for transport to the landfill. Trucks will be stationed adjacent to the excavation to facilitate easy loading, and minimize potential spills. However, some temporary stockpiling of soil may be necessary. Soils requiring stockpiling will be placed on heavy plastic sheeting near the excavation. Stockpiles will be covered with construction grade plastic sheeting each night, and following completion of soil removal activities. Stockpiles will be regularly monitored to maintain the integrity of the enclosure. The Soil Management Plan (Section 11.1 of the WP) describes stockpile management, safe-work, and erosion/stonnwater protection practices to be followed. 2.3.5 Soil Disposal and Site Restoration Soil disposal is scheduled to be performed concurrently with excavation. During excavation activities, trucks will stage adjacent to the excavation for loading. Each truck will require a manifest, signed by CA ARNG. All loads will be covered and manifested prior to leaving the CA ARNG facility. The soil will be delivered directly to a licensed landfill. If soils are stockpiled at the site, a rubber-tired front-end loader or backhoe will be used to move soil from the stockpiles to the trucks for transport to the disposal facility. All loads will be covered and manifested and will be delivered directly to the landfill. Site restoration activities will include removal of all materials and equipment from the Site, final cleaning of the work area, and inspection by CA ARNG and CESPK personnel. Any deficiencies 104700.4965.300 Page 2-4 April 2007