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A S S O C I A T E S I N C <br /> me <br /> Vapor Extraction/Air Sparge System Monitoring Frequency and Operating Ranges <br /> Monitored Item Frequency mummum eratin Ran e <br /> Injection airflow rates at each Daily at startup, monthly 3-5 cfm <br />' well head thereafter <br /> Injection airflow rates Daily at startup, monthly 30-50 cfm <br /> total output thereafter <br />' Injection air pressure Daily at startup, monthly 6-10 psi <br /> thereafter <br /> 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 scfim <br /> thereafter <br />' VE vacuum Daily at startup, monthly 30-60 niches water <br /> thereafter <br /> Service blowers Manufacturers' NA <br />' recommendations <br /> Well s4nig or fouling Quarterly NA <br /> Fail-safelcontrol check Startup, every six months NA <br /> Inspect stem fm site visit NA <br /> Site inspections will typically include monitoring and adjustment of system parameters to optimize VES <br /> and groundwater AS system efficiency, penodnc sampling and field monitoring of influent and effluent <br /> as required by the SJVUAPCD, and other periodic maintenance to promote continued operation of the <br />' remediation equipment Parameters to be monitored and adjusted in the field will include vapor <br /> extraction flow rates, air injection flowrates, induced vacuum responses at on-site wells if applicable, <br /> and hydrocarbon vapor concentrations with an organic vapor monitor approved by the SJVUAPCD <br />' Monitoring and sampling of existing groundwater wells and selected vapor extraction wells will <br /> continue on a quarterly basis <br /> 6.3.2 Systems Sampling r <br /> l e <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 unit <br />' To demonstrate compliance with SJVUAPCD regulations, the VES will likely be sampled at least once <br /> during the first week of operation, and once per month for the life of the remediation system With the <br /> exception of influent and effluent air samples collected and analyzed as detailed above, during the first <br /> 2 days of operation and later on a biweekly and monthly basis, all other sampling of the VES will be <br /> conducted using a field organic vapor monitoring instrument approved by the SJVUAPCD if at any <br /> time the results of laboratory analyses or field monitoring readings show emission limits to be <br /> exceeded, a confirmation air sample will be taken immediately and analyzed on a 24-how turnaround <br /> basis If emission hrruts are shown to be exceeded, the system will be shut down and any necessary <br /> 1 W 162574 OITAP report doc 11 <br />