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Revised Remedial Action Plan McBiilin Real Estate Investment Property 2154 South Ed Dorado Street,Stockton,California Page 10 Monitoring Well Network Surveying Upon completion of the proposed monitoring well network, a land surveyor licensed by the California Department of Consumer Affairs, Board of Professional Engineers, Land Surveyors, and Geologists will be retained to survey the top-of-casing elevation for each newly installed monitoring well. The survey data set will be uploaded into the GeoTracker database as required by law. Waste Disposal All investigation derived waste(IDW) will be stored on Site as described throughout this RAP in metal 55-gallon drums. It is anticipated that the solids component of IDW will be limited to soil cuttings and excess grout from MPE well installation. The liquid component of IDW is anticipated to be limited to well development water, semi-annual monitoring, and MPE system startup. All IDW will be transported and disposed of at an appropriate off-site facility under manifest. Documentation of the disposal will be included in the MPE system installation report. Proposed MPE System The proposed MPE system will consist of extracting soil vapor and groundwater using two (2) separate conduits from existing wells VW-1 through VW-3 and proposed wells, MPE-1 through MPE-6(Figure 3). Soil vapor will be extracted from the wells using a Mako Industries brand 500 TCAT-LR Thermal/Catalytic Oxidizer(Oxidizer). Groundwater will be pumped using A4 top inlet pneumatic pumps (or similar) capable of flowrates of up to 9 gpm. The oxidizer has a 20- horsepower (hp) positive displacement (PD) blower that can supply up to 12 inches of mercury (1-Ig) vacuum to the manifold with a corresponding maximum flow rate of 500 cubic feet per minute (CFM). Equipment specification cut sheets are provided in Attachment C. Individual 2- inch underground schedule 40 PVC piping will be connected from the each well to a manifold within the MPE compound prior to being connected to the oxidizer. The compound and trenching layout are shown on Figure 4. Each vapor line stub-up on the manifold will include a vacuum gauge,a sample port for collection of flow rates(using an anemometer)and vapor samples for PID measurements and laboratory analysis. Each well will be equipped with ball valves to assist in the operation and optimization of the system. Well construction detail and connections are provided on Figures 5a and 5b. Additionally, as stated above, two (2) sets of underground piping will be installed from the compound (vapor lines, pressure rated hose for supply compressed air to the pumps and groundwater water return line hose) to a junction box installed in the common system trench (Figure 4). hnitially, the oxidizer will be operated in thermal mode for soil vapor concentrations above 3,500 parts per million by volume (ppnrv) in the vapor stream. Catalytic mode will be used later,when soil vapor concentrations have been reduced in the vapor stream to less than 3,500 ppnrv. The process air will be combusted in the oxidizer at temperatures between 1,400- and 1,500-degrees Fahrenheit(°B)for thermal oxidation and 600 to 900 eF for catalytic operation. Supplemental fuel for the MPE system will either be propane or natural gas service. All construction will be completed in accordance with the rules and regulations set forth by the San Joaquin County