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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 2.0 TECHNICAL MANAGEMENT PLAN This Technical Management Plan describes the approach and procedures to be used to perform the supplemental removal action at CA ARNG Stockton. This Technical Management Plan provides additional information intended to supplement the Type II Work Plan dated August 2005. 2.1 GENERAL As stated in the WP (Versar, Inc., 2005), unexploded ordinance (UXO) support activities shall be conducted in full compliance with the CESPK, Department of the Army, and Department of Defense requirements regarding personnel, equipment, and procedures. All Munitions and Explosives of Concern (MEC) operations shall emphasize anomaly avoidance, whenever possible, and be performed in a manner consistent with the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and the National Contingency Plan. Therefore, the administrative requirements of Federal State or local permits are not required for implementation of any UXO procedures, including on-site destruction of UXO, if required, but the substantive permit requirements must be fulfilled. For the purposes of this buried debris removal action, the MEC operation is considered complete and an UXO technician is not required. Field crews shall be made aware that the excavation is to be performed in a site formerly thought to contain MEC. If any indications of MEC are identified, field operations shall be discontinued, the Site secured and an UXO technician brought in to assess the potential threat. Further field operations will be performed following the protocol established in the Type II Work Plan. Underground utility clearance and/or excavation permits, if required, must be obtained prior to commencement of any excavation activities. The prime contractor is responsible for contacting the appropriate agencies or companies to mark the location of all subsurface utilities in the construction area. All located utilities should be marked by paint, pin flags, or other appropriate means to visually delineate their approximate subsurface routing. Supplemental investigation activities will comprise collecting soil samples for the purpose of characterizing the identified contaminated soil for disposal, excavation and removal of the contaminated soil, and backfilling the excavation with clean soil. Pre-characterization soil samples will be collected using GeoProbe technology to obtain discreet soil samples from the identified anomaly for laboratory analysis. The laboratory analytical results will be submitted to the contract landfill for pre-characterization of the contaminated soil for disposal. Upon acceptance of the soil by the disposal facility, excavation activities will proceed. Sections 2.2 and 2.3 describe the procedure for pre-characterizing the soil for disposal, and for excavation of the contaminated soil, respectively. 104700.4965.300 Page 2-1 April 2007