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Ozone Injection Pilot Test Report MANTECA CITY CORPORATION YARD 210 East Wetmore Street, Manteca, California ' 1.0. INTRODUCTION At the request of Mr Frederic Clark of the City of Manteca, Advanced GeoEnvironmental, Inc ' (AGE) has prepared this report for the property located at 210 East Wetmore Street, Manteca, California The report documents the procedures and results of 24-week ozone infection pilot test ' The site and the surrounding area are illustrated in Figure 1, on-site structures and well locations are illustrated on Figure 2 Site background information,including the site history,and descriptions and results of previous investigations are detailed in the AGE-prepared Corrective Action Plan (CAP) ' dated 07 November 2003 All field work procedures and reporting requirements are in accordance with guidelines issued by ' the Central Valley Region of the Water Quality Control Board (CVRWQCB) for subsurface investigation of underground storage tank (UST) system sites 2.0. PROCEDURES The pilot test was initiated on 31 August 2004,and is currently in operation at the site However,the ozone infection system did not run continuously,AGE estimated that the system was nonoperational for approximately 8 to 10 weeks during the months of October 2004 to February 2005 due to ' equipment malfunction and power failures at the site AGE believes the equipment malfunctions have been taken care of by installing a much larger capacity air compressor (the third compressor to be installed at the site) to handle the load The ozone infection system has not shut down due to ' equipment malfunction since March 2005 Due to the loss of operational time during the 24-week pilot test, AGE will use data collected from the site between 31 August 2004 and 12 May 2005 to evaluate the effectiveness of the ozone infection system to remediate dissolved methyl tertiary-butyl ether(MTBE) concentrations in the ground water at the site ' 21 24-WEEK OZONE INJECTION PILOT TEST The pilot test was conducted using a HC-2 50 Ozone Generator,which could produce ozone at a rate of up to 2 5 pounds per day at a maximum pressure of 25 pounds per square inch (psi) The generated ozone was piped into nine infection wells (OW-1 through OW-9) at a pressure of I approximately 8 to 10 psi, and then infected into the MTBE-impacted zone via a microsparge point in each well that was set at either between 27 5 and 30 0 feet below surface grade (OW-1 through OW-3 and OW-5 through OW-9) or between 28 and 30 5 feet below surface grade (OW-4), the ozone was supplied to each infection well on a two-hour on and two-hour off cycle Each month, the oxygen reduction potential (redox or ORP) and dissolved oxygen (DO) Advanced Geounvironmentai,Inc I