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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-007L/Task Order W91238-05-F-0084 Version 2.0 2.2 PRE-CIIARACTERIZATION The soil characterization sampling comprises the following tasks: Collection of soil samples from the area identified in the geophysical report, using direct- push sampling techniques, prior to excavation. Laboratory analysis of characterization samples. Submitting the analytical data to the disposal facility for acceptance. At the request of the CVRWQCB, Versar will perform background sampling for arsenic during the pre-characterization field effort. A total of six samples will be collected at depths of two and five feet bgs, from three borings within the boundaries of the CA ARNG Stockton facility. Figures 6 and 7 depict the previous arsenic sample locations, and the proposed background sampling locations at the FMS and AASF, respectively. An addendum to the Field Sampling Plan (FSP), included in Appendix C, describes the protocol to be used to collect, analyze, and document the pre-characterization sampling. 2.2.1 Site Preparation Site preparation activities will include; marking the site appropriately and notifying Underground Service Alert as required by law; and notifying CA ARNG and CESPK personnel of the field activities and schedule. During the preconstruction meeting, Versar personnel will discuss access routes and site activities with CA ARNG and CESPK personnel. 2.2.2 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, respectively of the WP. 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. 2.2.3 Sample Collection and Analysis All drilling or direct-push sampling activities shall conform to state and local regulations and shall be supervised by a state licensed geologist or state licensed engineer. For the purposes of characterization, two, four-point composite samples are required. A total of eight soil samples will be collected from the locations shown in Figure 5, at two-foot intervals between 8 and 15 feet bgs, or any depth with indications of staining or debris. The depths were selected based on data from Electrical Resistivity Profile RL1 (Appendix B, Figure 2) and seismic refraction line SL2 (Appendix B, Figure 5) which identify potential anomalies between 8 and 15 feet bgs. Following collection, the samples will be submitted to the contract laboratory for compositing and analysis. Each sample will be analyzed for full range total petroleum hydrocarbons (TPH, 104700.4965.300 Page 2-2 April 2007