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Revised Remedial Action Plan <br /> Menillin Real Estate Investment Property <br /> 2154 South El Dorado Street,Stockton,California <br /> Page 6 <br /> 6. Apex does not propose any system monitoring except influent and effluent monitoring and <br /> sampling.During routine operation and maintenance,wellhead vacuum pressure should be <br /> monitored at each DPE well. Assuming Apex proposes new dedicated DPE wells,vacuum <br /> pressure in the surrounding monitoring wells should also be monitored to evaluate radius <br /> Of influence. <br /> 7. By 25 March 2022, please submit a revised RAP that includes the following: <br /> a. A proposal for additional dedicated DPE wells (Comment 1). <br /> b. Clarification as to which wells will be utilized as DPE wells (Comment 2). <br /> c. A revised proposal of DPE well screen intervals (comment 3) <br /> d. Clarification of proposed the dewatering capability of the system, as well as the <br /> capability of the system to remove vapor in the presence of large volumes of water <br /> (comment 4). <br /> e. A system well/manifold piping construction design plan with the possible <br /> expansion capacity (Comment 5). <br /> f. A plan for operating and monitoring the system for efficiency and efficacy <br /> (Comment 6) <br /> PURPOSE OF MULTI-PHASE EXTRACTION REMEDIAL ACTION PLAN <br /> The purpose of this Revised RAP is to address the CVRWQCB comments and concerns above <br /> along with detailing the proposed installation of a MPE system at the Site. The primary goals of <br /> the system are to reduce and/or cease hydrocarbon migration in groundwater as well as effectively <br /> reducing concentrations of hydrocarbons in the soil beneath the Site. <br /> To accomplish these goals, Apex proposes to use existing wells VW-1 through VW-3 and 6 <br /> additional MPE wells (MPE-1 through MPE-6) as depicted on Figure 3. Apex will use <br /> submersible pneumatic pumps installed in each well to effectively draw down groundwater while <br /> applying vacuum to extract soil vapor from each wellhead. To ensure flexibility for system <br /> expansion, two (2) sets of underground piping will be installed from the compound (vapor lines, <br /> pressure rated hose for supply compressed air to the pumps and groundwater water return line <br /> hose) to junction boxes installed in the common system trench. A proposed trench layout is <br /> included in the attached Figure 4, <br />