AR 040406 MOU - Laserfiche WebLink

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The total cost for existing wellhead treatment systems is $28,760,000, the combination of the Unrecovered Capital Costs ($4,005,000), the Unrecoveered Annual Costs ($803,000) and the Estimated 5 Year Annual Costs ($23,952,000). 4.2 TASK 2 - PLUME CONTAINMENT The plume containment effort is conceptually focused on operation of two parallel remediation systems downgradient of the 'Bunker Area' and the "160 -Acre Parcel" in order to intercept higher concentrations of perchlorate and other contaminants before they spread further in groundwater. A plume containment strategy is currently being implemented by the County associated with contamination emanating from the 'Bunker Area." A portion of this is contained in the wellhead treatment aspect of this White Paper, as replacement of Rialto Well #3 is part of that effort. Other aspects of the County's approach are discussed herein, as are all aspects of the plume containment approach for elevated levels of contamination emanating from the I60 -Acre Parcel". This section discusses three sub -tasks: 1) engineering design; 2) data collection and characterization; and, 3) plume containment efforts. 4.2.1 TASK 2.1: ENGINEERING DESIGN SUB -TASK Engineering design is necessary to develop the details of the remedial strategy to intercept higher concentrations of perchlorate leaving the RABSP. The engineering design includes three primary components that are specifically directed at characterization and remedy selection for intercepting contamination: 1) project work scope documents; 2) conceptual model development; and 3) plume interception design. The components of engineering design will be performed concurrent with the data collection and characterization sub -task. Work Scope Documents A scoping document will be prepared by the RCBTC that broadly details the work to be performed for each of the project work scope elements. A sampling and analysis plan, health and safety plan, quality assurance plan and permitting agenda will be included as parts of the scoping document. A public participation plan will also be included in the scoping document to address the NCP/CERCLA public notification requirements together with a schedule that identifies how this will be accomplished. A preliminary draft, draft for circulation, and final version of the scoping document will be developed by the RCBTC. The circulation draft will be subject to public comment. All comments will be incorporated or addressed prior to finalization. Conceptual Model A conceptual model will be developed to guide data collection and selection of appropriate remedial actions. The conceptual model generally will attempt to incorporate both hydrogeologic and contaminant information and identify data gaps. Recommendations will be made regarding filling data gaps by characterization efforts outlined in Task 2.2. A report will be submitted that summarizes the results of the background data collection effort and presents Rialto -Colton Basin Technical Committee - White Paper Revised 2/22/2006 5