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0 Permitting As required, licensed contractors will be utilized during the installation of the <br />remediation system The remediation system's thermal/catalytic oxidizer will require an air <br />quality control permit from the appropriate Air Pollution Control District (APCD) An APCD <br />permit application will be prepared and submitted by ATC <br />10.3 Remediation System O&M <br />The remediation system will be operated twenty-four hours per day, seven day per week to effectively <br />remediate the hydrocarbon -impacted soil and groundwater at the site Operation and maintenance <br />activities will be conducted weekly When the remediation system is started soil gas samples from the <br />total source, process, effluent, and all individual vapor extraction wells will be field screened with a flame <br />ionization detector (FID) or a photo ionization detector (PID) This data will serve as baseline data for <br />vadose zone soil remediation In addition, source, process, and effluent vapor and groundwater samples <br />will be collected and analyzed by a State of California certified laboratory for the purpose of verifying the <br />field screening data and maintaining operational parameters of the groundwater treatment unit <br />Thereafter, soil gas samples will be field screened weekly from the well, or wells, utilized during that <br />operating period for remediation, and the source, process, and effluent analytical vapor samples will be <br />collected and analyzed monthly The source, process, anti effluent' analytical groundwater samples will be <br />collected and analyzed bi-monthly or at the direction of the sanitary sewer utility Additionally, during <br />remediation the oxygen concentration in the extracted soil gas will be field screened with a GasTechTm <br />oxygen sensor The data collected will be utilized to maximize extraction of hydrocarbon vapors from the <br />vadose zone The use and operating configuration of the extraction and sparing wells may be alternated to <br />effectively maximize soil and groundwater remediation <br />The remediation equipment, which will initially consist of a groundwater extraction system, a vapor <br />extraction thermal/catalytic oxidizer system, an air stripper and carbon groundwater treatment system, and <br />an air sparge unit will be operated as designed per the manufacturer specifications Initially, the vapor <br />extraction only portion of the remediation system will operate until influent vapor concentration drop <br />below approximately 7,000 ppm, the concentration at which a typical thermal oxidizer no longer needs to <br />dilute the influent stream At that point, the groundwater extraction wells will go online and operate in <br />conjunction with the vapor extraction wells again until influent vapor samples drop below the dilution <br />concentration Once influent dilution is no longer needed, the air sparge equipment will begin to operate <br />The remediation system will continue to operate with the groundwater extraction, vapor extraction, and <br />air sparge with the vapor extraction treatment unit in the thermal oxidizer mode until vapor concentrations <br />reach a level at which catalytic mode can efficiently be used The remediation system will continue to <br />operate with all phases until vapor concentrations drop below 500 ppm At that point, the operation dual <br />phase extraction system will be discontinued The vapor extraction only and air spargmg portions of the <br />remediation system will operate and the vapors will be treated via carbon or direct vent as specified by the <br />EZ 100966 CAP <br />s 1EZ Serve\EZ 1009661Reports1100966CAP <br />22 <br />ATC Associates Inc <br />ATC Project No 43 25827 0026 <br />