SITE INFORMATION AND CORRESPONDENCE_FILE 2

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U f Chronology 3 page ' 2701 W. March Lane, Stockton 05/10/99 Date on-site air sparge/soil vapor extraction feasibility test conducted. Details in ERI consulting's Air Sparge/Soil Vapor Extraction Test Report, dated October 18, 1999. 2/28/99 Date of Corrective Action Plan (CAP) submitted to EHD for periodic groundwater extraction and transport off-site. .EHD approves as i interim remediation action plan (TRAP) in letter dated February 2, 2000. If i 06 to 10/00 "UST-MW" installed•in UST pit and periodic groundwater extraction from this well and MW-3 begins as TRAP. Details in ERI consulting's second Corrective Action Plan, September 25, 2001. 11/23/00 Site now assigned to Dot Lofstrom, LOP Unit IV. 03/02/01 EHD files legal case #CV009241 with San Joaquin County court for_ j UST Regulation violations. `I 09/25/01 Date of ERI consulting's Corrective Action Plan which proposes ozone sparge/injection and includes results of periodic groundwater I extraction on-site June to October 2000. EHD approves. in correspondence dated October 2, 2001. 10/02/01 Date of ozone injection/CAP conditional approval EHD letter. 11/01/01 Site now assigned to Margaret Lagorio, LOP-Unit IV supervisor. f 01/21/02 Date ten air 'sparge wells installed on-site. Details in ERI consulting's Air Sparge Well and System Installation Report, dated April 22, 2002. 08/15/02 Ozone sparge system goes online. 05/06/08 Date the EHD comment letter to Stantec consulting's Work Plan for Additional Off-Site Assessment, and Hydrogen Peroxide Bench Scale Testing, dated March 20, 2008. MW-11 D/I/S proposed off- site. Problems with off-site private property owner access holds up installation of well. 12/003/08 Date of EHD letter commenting on bench scale testing. 01/27/09 Date the EHD received Stantec consulting's Work Plan for Batch Extraction, dated December 10, 2008, on Geotracker.