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Corrective Action Plan Page 9 <br /> Cutter/Western Lift Site <br /> GPE Project No. 102.3 <br /> December 12,2003 <br /> 4.3 Remedial System Monitoring` <br /> The system will be monitored during)the course of the i,initial operation. This will include <br /> making depth to groundwater .measurements, airflow 'and pressure measurements, vapor <br /> readings with a portable ionization detector (PID), and field measurements of oxygen in the <br /> groundwater. The system will be monitored on a daily basis for the first three days of <br /> operation. After the initial three days of operation, the system will be monitored twice a. <br /> week. Dissolved oxygen measurements will be made during normal groundwater monitoring <br /> events. <br /> 4.3.1 Process/Effluent Air MonitoAng <br /> ,. Airflow measurements will be made during„any flow adjustment to the vapor extraction <br /> system. A digital manometer will be inserted in to the vapor extraction sample port to <br /> measure the rate of vapor extraction: This method will be used to measure both the total <br /> extraction rate and the rate from each well, so that the system can be balanced. The manifold <br /> vacuum will be monitored with a permanently installed magnahelic guage. Air samples will <br /> be collected at the start up of the system and at various times during the operation of the <br /> system. At least once each week, PID readings will be taken from vapor samples collected at <br /> the sample port downstream of the Catox system or carbon filters as well as upstream of the <br /> vapor extraction dilute air valve. Air sample's for laboratory analysis will be collected from <br /> these same points at least monthly. (The air sample collection and analysis procedure is <br /> addressed in Section 5.3. <br /> 4.3.2 Sparge Air Monitoring <br /> Airflow measurements will be made during :any flow adjustment to the air sparge system. <br /> Airflow and manifold pressure monitoring measurements will be made at least weekly. <br /> Rotameter airflow gauges will be used to measure the total sparge rate, the individual well <br /> sparge rates. <br /> L , <br /> 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone(209)569-0293 <br /> Modesto,CA 95356 Fax(209)569-0295 <br />