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Area' of the RABSP. Data for the County's design effort has already been collected and costs for that process are included in Table 1. A relatively larger mass of contamination appears to be associated with the "160 -Acre Parcel" area and, similar to the County's program, interception of the perchlorate contamination emanating from this area will be achieved using a network of groundwater extraction wells. Data must be collected to design this approach. Regional Characterization and Analysis to Support Further Remedy Selection and Optimization Beyond the need for specific characterization efforts associated with containment of contamination emanating from the RABSP, data must be integrated in a numerical groundwater model that will be prepared for the project. This conceptual model will support management of the plume containment systems, optimization of wellhead treatment systems and potential design of supplemental mitigation strategies down -gradient of the plume cutoff systems. Estimated costs for the Data Collection and Characterization Subtasks in Table 1 include costs associated with source -control oversight; expenditures for County remedial characterization and data collection for the "160 -Acre" design and investigation downgradient of the plume containment strategy. 4.2.3 TASK 2.3: PLUME CONTAINMENT SUBTASK A second plume interception and treatment system is envisioned in the area east of the County's system. Inasmuch as the mass of contamination from the "160 -Acre Parcel" appears to be significantly larger than the plume that originates from the "Bunker Area", funding estimates for this work anticipate a system that is 50% larger than the system being installed by the County. Like the County's system, it is anticipated that the 160 -Acre Parcel treatment system will remove perchlorate from groundwater and deliver the treated product to the community's potable water supply systems. Plume containment involves the ongoing operation of the two systems. The components of each system are discussed below. "BUNKER AREA" TREATMENT SYSTEM As discussed earlier in the wellhead treatment system, the system being installed by the County has a wellhead treatment component, but also involves the installation of a number of specific groundwater extraction wells. The efforts involved in installing those wells and associated infrastructure to extract and transport water to the treatment system is included in this sub -task while the treatment system is included in the wellhead treatment section. These costs are contained in Table 1. "160 -ACRE PARCEL" TREATMENT SYSTEM Using the engineering design developed in Task 2.1 and building on data from Task 2.2, installation of the "160 -Acre Parcel" treatment system is expected to involve the following: Acquisition of all necessary regulatory permits and compliance activities in accordance with California DHS 97-005; Rialto -Colton Basin Technical Committee — White Paper Revised 2/22/2006 7