SITE INFORMATION AND CORRESPONDENCE

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*.no, Chronology Page 5 of 6 Former Morita Brothers 814 E. Charter Way, Stockton, CA 95206 contaminants proposed to be left in place and that the elevated TPHg concentrations in monitoring well MW-208 were likely to be associated with the contamination at 749 E. Charter Way. The EHD also reviewed data related to increasing MTBE concentrations in monitoring well MW-109, and concluded that the data indicated a migrating low concentration, low mass plume of MTBE that probably originated from on-site, but which posed minimal threat to sensitive receptors or human health; a similar concentration history was shown by MW-106, located between the source area and MW-109. The EHD did not concur with the closure recommendation at that time to allow for additional sampling of MW-109 to validate the model proposed by the EHD that provided a justification to consider site closure despite rising MTBE concentrations in MW-109. 05/20/2009 Date the EHD discussed closure of the site with the Central Valley Regional Water Quality Control Board. 09/10/2009 Date of Site Closure Summary Report that summarizes the site work and recommends site closure. 10/08/2009 Date of Groundwater Monitoring 16 Quarter 2009 that contains water sample results from 8/13109. 10/29/2009 Date the EHD prepared and sent to the Central Valley Regional Water Quality Control Board a 30-day closure notification letter with case closure summary form and site chronology. 11/18/2009 Date the Central Valley Regional Water Quality Control Board issued a concurrence letter for site closure. 12/01/2009 Date the EHD prepared and issued a letter notifying the RPs that CVRWQCB concurred with site closure. The active RP was requested to provide an updated certification of notification to all record fee title owners of impending site closure, and the RP was directed to destroy all groundwater monitoring wells. 12/09/2009 Date the EHD received the certified Record Fee Title Owner form from RP Frank Morita. 03/22/2010 Date the EHD issued a work plan approval letter for destruction of 17 monitoring wells and ownership transfer of two monitoring wells to the RP of another LOP site. 04/24/2010 Dates EHD representatives witnessed destruction of 17 groundwater monitoring through wells. 04/28/2010 08/09/2010 Date the EHD reviewed well destruction report; waste manifest for disposal of materials removed from monitoring wells was not signed by receiving facility. 08/16/2010 Date the EHD received by email a copy of a properly signed hazardous waste manifest for disposal of materials removed from the destroyed monitoring wells.