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4. OPERATION OF THE UVB SYSTEM ' 4.1 SAMPLING INTERVALS AND REPORTS 41.1 Baseline ' Prior to startup, selected groundwater wells will be monitored for the applicable parameters described in Section 4 2 4.1.2 General Operation All wells selected as system monitoring wells, and also the UVB pressure-side offgas port, will be sampled, analyzed, and measured (as appropriate) for the parameters listed in Section 4 2 on a quarterly basis, and the data will be reviewed to maintain optimum operating efficiency During and after initial startup, through the first two weeks, only designated nearby wells and ' influent and effluent vapor ports will be measured for the parameters stated in Section 4 2, • prior to startup (to establish a baseline for evaluation of the system) ' • within 24 hours after startup • 7 and 14 days from startup The startup period consists of the first 2 weeks from initial turn-on All analyses during the startup period will be performed within 7 days of sampling, and the information will be reviewed for any necessary adjustment in order to have an effective and efficient start of the system All analytical data will be entered ons spreadsheets and graphed These data will be evaluated P � p quarterly to maintain the system at its optimum efficiency and to determine when acceptable ' contaminant levels are reached ' 4.2 MONITORING PARAMETERS AND PROCEDURES Monitoring wells will be purged prior to sampling, in accordance with the existing quarterly groundwater monitoring plan 4.2.1 Vapor Parameters Measured ' 4.2.1.1 Effluent Vapor ' All parameters listed below will be measured from the pressure side of the UVB blower before offgas treatment begins The sampling port will be approximately 18 inches out from the effluent port on the blower and approximately 12 inches before any union 1 Relative humidity (optional) 2 Air temperature (optional) ' WP61 73942 WPI096 TX 5 7