SITE INFORMATION AND CORRESPONDENCE

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NOW CHRONOLOGY YAMADA BROTHERS 15406 S. Tracy Boulevard, Stockton LOP Site: 4067 CVRWQCB Case # 390814 APN: 18917007 07/18/1991 Two USTs removed on this date. No soil results are available for the UST removals. The ground water sample results for the UST removals were positive for TPH-d. Ground water sample results are presented in Roy F. Weston, Inc. Laboratory Report, dated August 5, 1991. 01/06/1994 The date EHD filed an Unauthorized Release Report Form for ground water contamination discovered at the time of the UST removals. 10/19/1998 Five soil borings were completed to ground water and soil and ground water samples were collected for analysis. Soil and ground water results are presented in Preliminary Site Assessment Report, prepared by Advanced GeoEnviron mental, Inc. (AGE), dated February 12, 1999. 11/23/1999 Three monitoring wells (MWs)were installed on this date. No soil samples were collected for analysis. The scope of work is summarized in AGE-prepared Quarterly Report-Fourth Quarter 1999, dated March 2, 2000. 10/10/2001 Four borings were completed to ground water and four grab ground water samples were collected for analysis. No soil samples were collected for analysis. The finding for this scope of work can be found in the AGE prepared Additional Site Assessment Report dated December 12, 2001. 04/15/2004 Four additional MWs were installed on-site on this date. The work and sample results are presented in AGE-prepared Monitoring Well Installation Report, dated December 20, 2004. 08/23/2009 Due to gasoline concentration in the area of MW4 only, a limited ground water extraction program began on this date. By September 23, 2009, approximately 15,000 gallons of ground water had been removed/extracted and stored on-site in an aboveground Baker tank. Pre-extraction, active extraction, and post extraction ground water samples results are in AGE-prepared Ground Water Batch Removal and Ground Water Monitoring Report, date May 10, 2010. 05/19/2010 Four additional soil borings to ground water were completed west of MW4 on this date. The results of this scope of work are presented in the AGE- prepared Closure Summary Report, dated September 2, 2010. 10/13/2010 On this date, EHD met with the CVRWQCB to discuss site closure. A 30- day closure concurrence request letter will be sent to the CVRWQCB. 11/15/2010 LOP file, Site Chronology, and CCS processed for signature and mailing of the 30-day closure concurrence request letter to the CVRWQCB.