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ATC Associates hic. 1 1 1 117 Lone Pahn Avenue, Suite 201 Modesto, California 95351 CVYJI/ 209-579-2221 A s s n c i n T e s i N c . Fax : 209-579.2225 this typical schedule will be made if additional requirements are specified by the SJVAPCD in the Authority to Construct/Permit to Operate for this site. Routine maintenance of the system will be performed during these site visits and as follows: 9.2.6 Vapor Extraction System Monitoring Frequency and Operating Ranges Monitored Item Frequency (miniruum) O ceratin Rau e VE Emission airflow rates Daily at startup, monthly thereafter 100 - 250 sefm VE Emission (PID) Daily at startup, monthly thereafter using NA a miniRae 2000 PID VE vacurmr Dailly at startup, monthly thereafter 1-14 itches H Service blowers MannfaC6m'Crs' reCOnnrlCllda[ IO115 NA Influent & Effluent Vapor Once During Startup and Mouth) TO-3 & TO-15 Fail-safe/control check Startup and monthl NA Temperature Every site visit 4400 — 1 ,800 ° F Inspect piping/manifold/well heads Evety site visit NA Site inspections will typically include monitoring and adjustment of system parameters to optunize vapor extraction system efficiency, periodic sampling and field monitoring of influent and effluent as required by the SJVAPCD, and other periodic maintenance to promote continued operation of the remediation equipment. Parameters to be monitored and adjusted in the field will include vapor extraction flow rates, induced vacuum response at monitoring wells if applicable, and hydrocarbon vapor concentrations with an organic vapor monitor approved by the SJVAPCD. Monitoring and sampling of existing groundwater wells will continue in accordance with the current schedule. 9.2.7 System Sampling Parameters Typical SJVAPCD guidelines require that during the startup phase of the off-gas abatement unit, influent and effluent air samples be collected to evaluate the unit' s destruction efficiency. To demonstrate compliance with SJVAPCD regulations, the VES will likely be sampled at least once during the first week of operation, and once per month for the life of the remediation system. With the exception of influent and effluent air samples collected and analyzed as detailed above, during the first two days of operation and later on a biweekly and monthly basis, all other vapor sampling will be conducted using a PID approved by the SJVAPCD. If the results of laboratory analyses or field monitoring readings show emission limits to be exceeded, a confirmation aur sample will be taken immediately and analyzed on a 24-hour turnaround basis. If emission limits are exceeded, the system will be shut down and necessary corrective action will be performed before repeating the startup sequence. SJVAPCD will be notified that emission limits were exceeded within 24 hours of such indication. SVE System Design Pian ATC Associates Inc. Stockton City Tax! Page 11