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Former Countryside Market,Stockton, California May 20,2013 Feasibility Study and Interim Remedial Action Plan As the above table indicates, field DO and ORP measurements in wells u gradient (MW-4 and MW-5) and downgradient(MWA MW-2, MW-3, MW-6 and MW-7) of the proposed AS wells will be collected on a quarterly basis. Such measurements will also be routinely collected from the proposed observation wells. These data will be used to evaluate sparge system performance/elle iveness. Results of the routine monitoring and sampling, treatment system O&M, anc system performance will be included in the quarterly reports. Groundwater monitoring analytical results rom the sampling events will be used throughout the remediation process to document decreasing VO concentrations. All purged wastewater will be properly recycled at a licensed facility. 7.6 Plume Stability Monitoring All of the feasibility testing and IRAP implementation data along with tl�e vertical plume delineation findings (Section 6.0) will be used in conjunction with ongoing groundw er monitoring and sampling results to create a more refined picture of the plume in terms of its lateral and vertical extent, as well as how it moves over time. Soil and groundwater contaminant distribution data will be plotted on isocontour maps, and geologic cross-sections will be generated utilizing all available boring and CPT data as part of the final RAP to both present these results and characterize the lithology in the areas where sparge system operations will be conducted. Because sparging increases the potential for the lateral movement of conta inants, monitoring for plume stability will be a key IRAP component, and the proposed additional observation well locations were specifically selected for this primary purpose. The paramount component of the monitoring program will be to ensure that sparging operations do not serve to increase the migration of contaminants towards on- Site or off-site domestic wells. Minimizing the potential for plume migration to occur during sparge testing and full-scale operations will be achieved through proper treatment system management, including implementing a pulsed airflow remediation strategy, as necessary, to all w water to flow through the sparging zone when the system is turned off. Such practices also serve maintain remedial efficiency and keep the plume from being diverted away from the sparging zone of influence. Fem,Nlq SWdy az Fws,ujiy sMy S TRAP Te Finaldx 7-7 The Source WOUR Inc.