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I Revised Remedial Action Plan McBillin Real Estate Investment Property 2154 South El Domdo Stmet,Stockton,California Page 11 building codes. The source for electricity and natural gas is anticipated to be Pacific Gas&Electric (PG&E) and permitting for access is discussed earlier in this Revised RAP. Extracted groundwater will be directed to a 500-gallon holding tank prior to being heated by aeration using a low-profile air shipper and liquid phase granular activated carbon before discharge to the sanitary sewer. Vapors from the air stripper will be directed to vapor phase carbon vessels for treatment prim to being discharged to the atmosphere. Apex anticipates 1.5 to 3.5 gpm will need to be pumped from each well to dewater the wells and surrounding soil. With that said,Apex has designed the system to process and treat 20 gpm from the subsurface. During startup, Apex will take a systematic approach to how many wells are operated at any given time. Apex will use water samples collected during the development of the MPE wells to choose two (2) to three (3) wells with the highest hydrocarbon concentrations to initially extract from to gauge groundwater intake of the system. Additional wells will be added one (1) at a time until the system is at approximately 90 percent(%) of the permitted discharge limit. Once the number of wells is established, Apex plans to rotate wells on a bi-monthly to quarterly schedule to start. This schedule will be refined after a full cycle of wells has been completed. The MPE system includes a groundwater flow totalizer prior to discharge. Flow and concentration data will be used to calculate the amount of total mass of hydrocarbons removed. System influent vapor concentration sample data will be used with flow rates to determine the total mass of hydrocarbons removed in the vapor stream. Influent and effluent vapor concentrations will be used to prove compliance with the SJVAPCD permit. The proposed MPE equipment will be equipped with an hour meter, so that cumulative operating times can be recorded and used to determine cumulative mass removed. The oxidizer is equipped with various safety controls including interlocks from the oxidizer to the blower including, high and low temperature alarms, automatic supplemental fuel controls, and process air and gas flow sensors. Since the majority of the MPE wells will be screened below the current DTW,the oxidizer will be interlocked with the groundwater extraction system to ensure it shuts down if the wells are not pumping. A review of the Mako Industries, Technical Specifications binder, destruction efficiencies can be expected to be approximately 99%. Process and flow diagrams for the MPE system are depicted in the attached Figures 6a and 6b. Construction and Installation Pending approval of this workplan, Apex will obtain the Authority to Construct from the SJVAPCD and the Industrial Discharge Permit from the City of Stockton prior to construction of the system. SVE wellhead connections will be completed within the well box by adding a PVC tee connection to the existing well casings (Figure 4 and Figures 5a and 5b). 2-inch PVC pipe will be connected to each well casing at the tee location and routed in an underground trench to the renrediation compound, for each VW/MPE well. Pneumatic pumps hung from well seals installed on the top