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Air Sparging Pilot Test Related Activities Report and Remedial Action Work Plan Former Countryside Market, Stockton, California April 30, 2015 6.6.1 AS/SVE System Startup Activities The AS/SVE system will be monitored in accordance with permit requirements, including regular collection of system operating parameters during the first few days of system startup and less frequent monitoring during subsequent system operation, again in accordance with SJV-APCD permit requirements. During this time, the field personnel will make any necessary adjustments and confirm that all mechanical and control equipment components are functioning properly. During the initial operation, influent and effluent samples will be collected for analysis of VOCs to estimate Site-specific mass removal and to confirm system operation in accordance with permit (and discharge) requirements. In addition, one day of SVE well monitoring activities will be conducted to evaluate the radius of vacuum influence and chemical distribution, and establish baseline concentrations at individual vapor extraction wells. 6.7 Routine AS/SVE System Operation & Maintenance Activities Once the AS/SVE system start up and optimization activities are completed, SGI will perform routine system operation and maintenance (O&M), including monitoring and sampling in accordance with the requirements specified in the SJV-APCD permit. Routine activities will consist of system component assessments, required record keeping, and routine sample collection and system maintenance. At a minimum, routine monitoring will be conducted by a field technician once per month, or as needed, in accordance with an AS/SVE system O&M manual. A copy of the O&M manual and HASP will be kept on-Site at all times during the AS/SVE system installation, startup and operation phases of work. In general, the following tasks will be completed during routine monitoring of the AS/SVE treatment system: A check of all electrical motors, the vacuum blower, air compressor, VOC emission control equipment, and associated manifold and piping. All mechanical equipment will be routinely maintained according to the manufacturer's specifications; Field measurements of extraction and injection system flow rates, applied vacuum and pressure, and total VOC concentrations; Field measurements of the amount of free water in the moisture knockout, elapsed operation time for blower/compressor, and electrical usage; Field measurements of VOC concentrations entering the first GAG vessel, between each subsequent GAO vessel, and exiting the last GAO vessel, and/or other air emission measurements as required by the SJV-APCD permit; and Field measurements of wellhead flow-rates, applied vacuum/pressure, and total volatile organic concentrations. 6-5 The Source Group, Inc.