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Revised Remedial Action Plan <br /> McBillin Real Estate Investment Properly <br /> 2154 South Et Dorado Street,Stockton,California <br /> Page 12 <br /> of each of the wells and set to approximately 6 inches from the bottom of each well. Tubing for <br /> the pump's groundwater return and air pressure will be secondarily contained and routed in <br /> underground trenching back to the compound. Surface completion for each wellhead will be made <br /> with new 24-inch traffic rated well boxes, set in a 9-inch concrete collar. <br /> After construction and installation is complete, startup of the system will be completed in <br /> accordance with the SJVAPCD and the City of Stockton. <br /> Operation & Maintenance <br /> As indicated above, Apex will take a systematic approach to how many wells are operated at one <br /> time. Apex will use water samples collected during the development of the MPE wells to choose <br /> two to three wells with the highest hydrocarbon concentrations to initially extract from to gauge <br /> groundwater intake of the system. Additional wells will be added one at a time until the system is <br /> at approximately 90% of the permitted discharge limit. Once the number of wells is established, <br /> Apex plans to rotate wells on a bi-monthly to quarterly schedule. This schedule will be refined <br /> after a Rill cycle of wells has been completed. Weekly operations and maintenance(O&M) visits <br /> will be made during the first month of operation to ensure system operation and run time. O&M <br /> visits will be made biweekly thereafter. <br /> Monthly water samples will be collected fiom the influent, midpoint and effluent locations <br /> analyzed for TPHg,TPHd,BTEX, and the five(5) fuel oxygenates by EPA Method 8260. Vapor <br /> samples will be collected from the Influent (pre and post dilution) and effluent sample ports <br /> monthly and analyzed for TPHg, BTEX and the five fuel oxygenates by EPA Method 8260. <br /> Samples will be submitted under a COC documentation to a California State certified analytical <br /> laboratory. Additional constituents may be added to the analysis of the influentand effluent water <br /> and vapor samples if required by the permits issued by the City of Stockton and the SJVAPCD. <br /> Copies of the permits and sampling requirements will be attached to the O&M manual for the Site. <br /> To assist with the MPE system operation and optimization the following readings and samples will <br /> be collected: <br /> • The MPE wells (VW-1 through VW-3 and MPE-1 through MPE-6) will be added to the <br /> semiannual groundwater monitoring and sampling schedule for the site. The analytical <br /> data will be used to optimize system to ensure wells with the highest concentrations are <br /> being extracted from. <br /> • Depth to water(DTW) and induced vacuum measurements will be collected from adjacent <br /> groundwater monitoring wells and non-operating MPE wells during the first two months <br /> of operation to verify groundwater capture and vacuum radius of influence. <br /> • Compressor pressure, operating hours, well pressure,flowrates and total gallons pumped <br /> will be recorded during each visit. <br /> • PID measurements will be collected from operating wells once per month. Flow rates, <br /> temperature and vapor samples will be collected from all system wells during the initial <br /> operating cycle of the wells, then quarterly thereafter. The data will be used to calculate <br />