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Remedial Action Plan June 14, 2017 Project#Z054000052 Page 8 clear (up to a maximum of 10 casing volumes of water from the well). Soil cuttings and purge/rinseate water generated during well installation activities will temporarily be stored on-site in California DOT approved 55-gallon steel drums pending characterization and disposal. The drums will then be removed by a licensed contractor to an approved disposal facility. Trenching and Piping Installation. Conveyance piping will consist of two inch diameter schedule 40 PVC Vapor Extraction piping and one inch diameter schedule 80 Air Sparge piping. Piping will be installed in short trenching runs from each well to the existing remediation compound. The pipe will be bedded in clean sand, with a minimum of 2 inches of sand all around the installed pipe. The trench will be backfilled with a minimum depth of 18 inches using one sack AB slurry. Trenches will be finished in kind, either concrete or asphalt paving, as encountered. SVE Installation. Three existing soil vapor wells (SVE-1 SVE-2 and SVE-3) will be connected to a new vapor extraction manifold using schedule 40 PVC pipe and fittings. A new vapor extraction manifold will be constructed and connected to a used 250 THERMCAT catalytic/thermal oxidizer manufactured by Mako Industries. The remediation system is optimized to run at a temperature of 14001 Fahrenheit (F) and a total flow up to 250 cubic feet per minute (cfm). The system is safeguarded to shut down if it reaches a temperature below 1200' F in accordance with San Joaquin Valley Air Pollution Control District (SJVAPCD) requirements. The remediation system also has a safeguard from overheating, exceeding a temperature of 18000 F. The system can automatically open a dilution valve and reduce the intake of petroleum hydrocarbon vapors, decreasing the amount of combustion in the oxidizer. SVE Operation. Process and Instrumentation Diagram shown on Figure 10.The Soil Vapor remediation system operates by extracting petroleum hydrocarbons from the soil vapor extraction wells (SVE-1, SVE-2 and SVE-3). The vapors are forced through a combustion chamber operating in either thermal or catalytic mode. The heated vapors are oxidized, forming carbon dioxide and water vapor, which is discharged through the exhaust stack to the atmosphere under a proposed SJVAPCD Permit to Operate. Hydrocarbon influent and effluent concentrations and equipment operating conditions (process temperatures, vapor flow rate, inlet vacuum, run time) will be measured, initially once per week. The frequency of these measurements may be reduced after the system stabilizes. Influent and effluent vapor samples for laboratory analysis will be collected initially at startup and monthly thereafter. AS Installation. Seven AS wells (AS-1 through AS-7) will be connected through a new air sparge manifold to a new Ingersoll Rand UP6-10TAS-125 Rotary Screw air compressor with 1-inch diameter galvanized steel pipe. AS Operation. Process and Instrumentation Diagram shown on Figure 10. When operational the air sparge system will inject compressed air into sparge wells AS-1 through AS-7 at pressures, flow rates and schedule that improve the performance of the vapor extraction system and promote biodegradation (typically 5 to 10 psi and 10 to 20 cfm at other similar sites). Remediation system design details are depicted on Figures 4 through 9. Soil and Water Disposal. Soil cuttings and waste water generated during the installation activities will be temporarily stored in DOT-approved 55-gallon drums pending transport and disposal. A licensed disposal contractor will transport the drums to an appropriate disposal or treatment facility. Reporting. Following the installation of the proposed air sparge wells, the SVE, and AS systems ATC will submit a report documenting the completion of this scope. Reports summarizing the remediation system