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' Chronology— City of Mant Corporation Yard Page 2 <br /> 210 E. Wetmore <br /> Manteca, CA <br /> 11/07/03 AGE submitted Corrective Action Plan, including a feasibility study, this date. <br /> AGE recommended insitu ozone infusion as the most cost effective remedial <br /> option for this site. The EHD concurred and requested submittal of a work <br /> plan for system design and installation i <br /> 03/05/04 Date of theOzone Injection Pilot Study Work Plan that was submitted this date <br /> by AGE. The EHD approved the Work Plan in correspondence dated March <br /> 10, 2004. <br /> 05/13/04 Installation of nine ozone injection wells began this date. See AGE report <br /> Ozone Injection Pilot Test Report dated August 31, 2004. The ozone <br /> distribution system was installed onsite on July 7, 2004; the system was <br /> placed in operation on August 31, 2004 and operated until June 26, 2007, <br /> 06/17/08 Closure Summary Report submitted this date by AGE. Quarterly groundwater <br /> monitoring and sampling has been corjducted since April 13, 2001; analytical <br /> results have been reported as non-detect in all wells for at least the past four <br /> quarters. The ozone system has been off for a year and no rebound of <br /> contaminant concentrations in the groundwater has been observed. Low <br /> concentrations of contamination were detected in the soil samples that are <br /> located below groundwater and therefore subject to the ozone remediation. <br /> AGE compared site data to the SI=B-RWQCB ESL guidance documents and <br /> determined the site poses no threat from soil vapor intrusion; closest structure <br /> to the former tank pit area is 90 feet away. <br />