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i <br /> i25 January 2005 <br /> . AGE-NC Project No 01-0827 <br /> iPage 2 of 5 <br /> iZ.U. PROCEDURES <br /> Field procedures for ground water sampling are described below All field work was performed in <br /> i accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for <br /> the investigation of underground storage tank (UST) sites <br /> i21 OZONE SPARGE SYSTEM OPERATION <br /> i The ozone-sparging (OS) system has operated continuously since 01 July 2003, the system was <br /> monitored and serviced at regular intervals throughout the quarter In December, the compressor <br /> piston was replaced The OS system consists of an ozone generator,which produces ozone-rich air <br /> i at 10 standard cubic feet per minute(scfin)and a pressure of 20 pounds per square inch This ozone- <br /> rich air is delivered to the IAS wells 1AS-1 through IAS-3 via a subsurface network of 3/8-inch <br /> polyethylene tubing <br /> i Because the injected ozone will eventually break down to dissolved oxygen DO a DO meter was <br /> 3 Y Yg ( )� <br /> i utilized at each monitoring well during the monitoring events to determine the effectiveness of ozone <br /> sparging DO and/or oxidation/reduction potential(ORP)in ground water wells adjacent to the IAS <br /> wells were measured on 28 September and 03 December 2004 Dissolved oxygen concentrations <br /> i have generally increased in ground water wells since remediation-system startup in July 2003, <br /> negative ORP values in the monitoring wells near ozone infection well IAS-1 suggest a reducing <br /> environment around the ozone discharge points (Appendix A) <br /> i <br /> 2 2 QUARTERLY AND MONTHLY WELL MONITORING <br /> iOn 03 December 2004,the depth to ground water was measured in monitoring wells MW-1 through <br /> MW-6 and vapor wells VW-1, VW-2d, VW-3 and VW-5d <br /> i <br /> 2 2 1 Well Monitoring and Evacuation <br /> iA Solrnst water level meter was used to measure the depth to ground water in each well After water <br /> levels were gauged,a Wattera inertial tubing pump or dedicated disposable bailer was used to purge <br /> imonitoring wells MW-1,MW-3,MW-5, MW-6, and vapor wells VW-1, W-2d, VW-3 and VW-5d <br /> of a minimum of three casing-water volumes (between 2 5 and 19 gallons) of ground water <br /> Temperature, pH, and conductivity were measured at regular intervals during purging using an <br /> iOakton model water analyzer Purged water from impacted wells was stored on-site in 55-gallon <br /> drums The field data sheets are included in Appendix A <br /> iAdvanced GeaEnvironmental,Inc <br /> I <br />