SITE INFORMATION AND CORRESPONDENCE

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Chronology page 3 2315 N. California Street, Stockton 11/29/05 Dates monitoring wells MW-1 S&D and MW-6S&D were installed and to MW-1 was destroyed under EHD witness and permits. 12/02/05 04/13/06 Date a meeting with responsible party, consultant, and the EHD was held to discuss site status and needed/required investigation. 05/10/06 Date of the EHD meeting comment letter sent to site responsible party. 08/14/06 Date of EHD approval letter of Foothill's Work Plan Addendum for CPT#3, #4, & #5 dated August 10, 2006. 08/17/06 Date of field work for CPT installations. 11/10/06 Date of the EHD comment letter on Foothill's Report of Findings from CPT#3, #4, & #5 dated October 30, 2006 that also include work plan for MWs 7, 8, & 9, which EHD deemed inadequate. 12/01/06 Date MW-6S&D installed. 12/17/06 Date of Foothill's response letter arid clarification for additional monitoring well installation with multiple proposals included. 01/05/07 Date of the EHD's comment letter to Foothill's December 17, 2006 proposals. 02/09/07 Date monitoring wells MW-7S&D, W-8S&D, and MW-9S&D were to installed off-site under EHD witness and permit. 03/07/07 10/05/07 Date of the EHD letter commenting on Foothill's Third Quarter — 2007 Monitoring Report and denies request to conduct Monitored Natural Attenuation (MNA) since DCA plurne not fully defined. 06/09/08 Date of EHD's stamped approval or reducing monitoring well sampling and reporting back to semi-annually. 06/16/08 Date of the EHD comment letter to the CUF regarding the 2008 5-year review evaluation. CUF recommends "site closure consideration" The EHD responds that DCA not delineated and consultant to evaluate groundwater extraction to reduce contaminant mass. 06/23/08 Date of the EHD approval letter of Foothill's Work plan for MW-90D and MW-9 9S installations dated June 10, 2008. 0811-4108 Date MW-1 OD and MW-11S were i istalled.