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vTt <br /> A S S O C I A T E S I N C . <br /> Vapor Extraction/Air Sparge System Monitoring Frequency and Operating Ranges <br /> Monitored Item Frequency (minimum) Operating Range <br /> Injection airflow rates at each Daily at startup, monthly 5-8 efin <br /> well head thereafter <br /> Injection airflow rates Daily at startup, monthly 30-50 efm <br /> total output thereafter <br /> Injection air pressure Daily at startup, monthly 5- 10 psi <br /> thereafter <br /> LI Monitor air sparge well head Daily at startup, monthly NA <br /> emissions (field) thereafter <br /> VE Emission airflow rates Daily at startup, monthly 100-200 scfm <br /> thereafter <br /> VE vacuum Daily at startup, monthly 15-25 inches mercury <br /> thereafter <br /> ( ] Service blowers Manufacturers ' NA <br /> recommendations <br /> ( I Well scaling or fouling Quarterly NA <br /> l .J Fail-safe/control check Startup, every six months NA <br /> Inspect piping system Every site visit NA <br /> IJ 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 SJVUAPCD, 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 /> Iwells if applicable, and hydrocarbon vapor concentrations with an organic vapor monitor approved <br /> J by the SJVUAPCD. <br /> -I Monitoring and sampling of existing groundwater wells will continue on a quarterly basis, <br /> I 6.3.2 Systems Sampling <br /> L <br /> Typical SJVUAPCD 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 /> LJ unit. To demonstrate compliance with SJVUAPCD 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 2 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 SJVUAPCD. If at any time the results of laboratory analyses or field monitoring readings <br /> l J w:\wordpro\62596\repons\irp.doe 10 <br /> ' l <br />