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1 v • <br /> v <br /> ASSOCIATES INC . <br /> performed once every two to four weeks, or as needed over the operating life of the remediation <br /> systems. Modifications to this typical schedule will be made if additional requirements are <br /> specified by the SJVAPCD in the Authority to Construct/Permit to Operate for this site. Routine <br /> maintenance of the VES and AS system will be performed during these site visits and as follows: <br /> ' Vapor Extraction/Air Sparge System Monitoring Frequency and Operating Ranges <br /> Monitored Item Frequency(minimum) Operating Range <br /> ' Injection airflow rates at each well head Dail at startup,monthlythereafter 5-8 cfm <br /> Injection airflow rates total output Dail at startu , monthlythereafter 30-50 cfm <br /> Injection air pressure Dail at startup,monthlythereafter 5-10 psi <br /> ' Monitor air sparge well head emissions(field Dail at startu ,monthlythereafter NA <br /> %T 1: <br /> VE Emission airflow rates Dail at startup,monthlythereafter 100-200 scfm <br /> VE vacuum Daily at startup,monthly thereafter 15-25 inches mercu <br /> ' Service blowers Manufacturers' recommendations NA <br /> Well scaling or fouling Quarterly NA <br /> Fail-safe/control check Startup,evea six months NA <br /> ' Ins ect piping system Eve site visit NA <br /> Site inspections will typically include monitoring and adjustment of system parameters to optimize <br /> VES and groundwater AS system efficiency,periodic sampling and field monitoring of influent and <br /> effluent as required by the SJVAPCD, and other periodic maintenance to promote continued <br /> operation of the remediation equipment. Parameters to be monitored and adjusted in the field will <br /> include vapor extraction flow rates, air injection flowrates, induced vacuum responses at on-site <br /> wells if applicable, and hydrocarbon vapor concentrations with an organic vapor monitor approved <br /> ' by the SJVAPCD. Monitoring and sampling of existing groundwater wells will continue on a <br /> quarterly basis. <br /> 6.3.2 Systems Sampling <br /> Typical SJVAPCD guidelines require that during the startup phase of the off-gas abatement unit, <br /> ' influent and effluent air samples to the VES be collected to evaluate destruction efficiency of the <br /> unit. To demonstrate compliance with SJVAPCD regulations, the VES will likely be sampled at <br /> least once during the first week of operation, and once per month for the life of the remediation <br /> ' system. With the exception of influent and effluent air samples collected and analyzed as detailed <br /> above, during the first two days of operation and later on a biweekly and monthly basis, all other <br /> sampling of the VES will be conducted using a field organic vapor monitoring instrument approved <br /> ' by the SJVAPCD. If at any time the results of laboratory analyses or field monitoring readings <br /> show emission limits to be exceeded, a confirmation air sample will be taken immediately and <br /> analyzed on a 24-hour turnaround basis. If emission limits are shown to be exceeded, the system <br /> t will be shut down and any necessary corrective action will be performed before repeating the <br /> startup sequence. SJVAPCD will be notified that emission limits were exceeded within 24 hours of <br /> such indication. <br /> s:\environmental\25291\reports\irp.doc 9 <br />