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Former Countryside Market,Stockton,California Feasibility Study and Interim Remedial Action Plan May 20,2013 Section 5.0- Proposed Feasibility Testing and Data Collection Plan This section presents the testing details for confirming the viability of the selected groundwater remedial technology, including data collection activities that will also serve to determiihe if one or more of the other final alternative technologies requires closer consideration for potential incorporation into the proposed interim and/or final cleanup strategy. This section also includes details for collecting soil physical property and background geochemical/bioremediation indicator data, as well as potential vapor extraction testing activities in the event the soil/soil gas data warrants this additional phase of work. Section 6.0: Vertical Plume Delineation Assessment This section presents the plan for assessing the migration of plume constituents that have been detected in downgradient domestic wells, including video logging and cone penetration testing (CPT) activities, which will be conducted first so that the results�ndings can be utilized to modify the proposed feasibility testing/data collection plans (Section 5.0), if necessary. Section 7.0: Interim Remedial Action Plan This section provides details of the recommended interim remedial action for the Site, and the strategy that will be employed to make adjustments to the plan based on the vertical plume delineation assessment(Section 6.0), and feasibility testing data/results (Section 5.0). Niso included in this section is a proposed long-term groundwater monitoring and sampling program. Section 8.0: Soil and Groundwater Cleanup Criteria This section specifies the soil and groundwater cleanup criteria for the Ste and surrounding area, and presents the basis for potentially establishing interim cleanup levels within the plume as part of a final RAP. Soil data proposed for collection during the feasibility testing phase (Section 5.0) will be compared against the appropriate criteria to determine if vadose zone remedial acti fities are required to cleanup residual impacts in the former UST area. Section 9.0: Reporting This section provides details associated with planned interim and ongoing progress reporting for the Site, including the future utilization of soil data (proposed to be collected during feasibility testing and IRAP implementation activities) to estimate the mass of petroleum hydrocarbons at the Site and surrounding area. Section 10.0: Estimated Proiect Schedule This section provides an estimated project schedule from proposed fgasibility testing through Site closure/post-remediation monitoring. Section 11.0: References This section provides citations to the documents referenced in this report. Feasibility SWdy&IRAP—TW Fnel.dw 1-2 The Source Group,Inc.