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Material necessary for System Decommissioning includes, but is not limited to: Backfill- <br /> pea gravel and Surface Replacement - asphalt concrete, Class B, 112" maximum <br /> aggregate with 5.8% asphalt content. <br /> Section 90.7 Vapor Extraction and Air Sparge S stems Monitoring <br /> After completion of installation, operation of the proposed VES and AS system shall be <br /> initiated in compliance with applicable regulatory agencies. Startup procedures shall <br /> include monitoring, maintenance and sampling within the first 5 days of operation. <br /> Operation and maintenance of the systems typically includes three site inspections for the <br /> first week of operation, and site visits once every week for the first month. After the first <br /> month of operation, site visits shall be typically performed once every two to four weeks, or <br /> as needed over the operating life of the remediation systems. Modifications to this typical <br /> schedule shall be made if additional requirements are specified by the SJVUAPCD in the <br /> Authority to Construct/Permit to Operate for this site. Routine maintenance of the VES <br /> and AS system shall 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 Daily at startup, monthly 3-5 cfm <br /> each well head thereafter <br /> Injection airflow rates Daily at startup, monthly 15-30 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 scfm <br /> thereafter <br /> VE vacuum Daily at startup, monthly 20-60 inches water <br /> thereafter <br /> Service blowers Manufacturers' NA <br /> recommendations <br /> Well scaling or fouling Quarterly NA <br /> Fail-safe/control check Startup, every six months NA <br /> Inspect piping system Every site visit NA <br /> Site inspections shall typically include monitoring and adjustment of system parameters to <br /> optimize VES and groundwater AS system efficiency, periodic sampling and field <br /> monitoring of influent and effluent as required by the SJVUAPCD, and other periodic <br /> maintenance to promote continued operation of the remediation equipment. Sampling <br /> consists of collecting one influent and one effluent air sample in tedlar bags for laboratory <br /> SP9 <br />