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Addendum to Corrective Action Plan Page 10 <br /> Former Manna Pro Site <br /> Project No 207 3 <br /> . August 12, 2002 <br /> 4,3.2 Sparge Air Monitoring <br />' Airflow measurements will be made during any flow adjustment to the air sparge system <br /> Vacuum flow and pressure monitoring measurements will be made at least weekly Air <br /> A rotameter airflow gauge will be used to measure the total sparge rate, and a magnetic <br />' gauge will be used to balance the individual well sparge rates Magnahelic gauges will be <br /> attached to the air sparge conveyance piping, vapor extraction piping, and vapor <br /> monitoring well heads to continuously measure pressure and vacuum, as needed <br />' Vacuum measurements will be made at nearby monitoring wells with screened intervals <br /> exposed above the water table <br />' 4.3.3 In-Situ Groundwater Parameter Monitoring <br /> In-Situ dissolved oxygen readings will be made in several nearby wells during normal <br />' groundwater monitoring events Quarterly groundwater monitoring events will be <br /> conducted on the established schedule <br />� i <br /> I <br /> I <br /> I <br /> i <br /> I <br /> • <br /> 2937 Veneman Ave , 413240 Geo-Phase Environmental Inc Phone(209)569-4293 <br /> Modesto, CA 95356 Fax (209) 569-0295 <br />