SITE INFORMATION AND CORRESPONDENCE

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Mr. Swaran Chouhan *saw 144"01 08 May 2008 Super Center Mart Page 2 of 2 701 E. Charter Way, Stockton wells MW-5 and MW-6 will be installed during the same phase of work herein approved and directs that this be done. The EHD directed you by letters dated 14 March 2006 and 26 June 2007 (reissued 09 July 2007) to submit a preliminary evaluation of the potential for vapor intrusion of nearby buildings from your soil and/or contaminated groundwater plumes by 01 June 2006. To date this document has not been received by the EHD and it is now overdue. Submit the evaluation or a work plan to assess soil vapor to evaluate the vapor intrusion potential to the EHD within 30 days of date of this letter. Previously, AGEI had recommended preparation of a work plan to implement groundwater extraction (GWE) and soil vapor extraction (SVE) for interim remediation of your site. By letter dated 26 June 2007 (reissued 09 July 2007) the EHD had approved this recommendation and directed preparation of the work plan with a discussion comparing the cost effectiveness of GWE and SVE with other potential applicable remedial technologies by 15 August 2007. This work plan has not been received by the EHD and is now overdue; submit the work plan to the EHD within 30 days of date of this letter. Include in the work plan estimates of the contaminant masses in soil and in groundwater. The extremely high contaminant concentrations in groundwater on your site strongly suggest that the plume of dissolved contaminants is unstable and migrating offsite, therefore the EHD believes that prompt implementation of interim remediation to reduce the contaminant mass is warranted. The EHD has addressed the need for interim remediation in letters dated 28 September 2005, 13 February 2006, 14 March 2006, and 26 June 2007 (reissued 09 July 2007); you are now directed to take all appropriate steps to have your site in active interim remediation no later than 17 November 2008. Further delay in providing the appropriate work plan and implementing the interim remediation merely allows more contaminant mass to migrate offsite, potentially impacting more groundwater, and wastes time and money by just monitoring. Questions or comments may be directed to Nuel Henderson by mail (address on letter head) or by telephone at (209) 468-3436. Nuel C. Henderson, Jr., PG Margare Lagorio, REHS Engineering Geologist, Unit IV Supervisor, Unit IV cc: James L.L. Barton, PG - CRWQCB Ally L. Colavita — AGE Mark Owens — State Cleanup Fund WP Approval and Directive Letter 0508