SITE INFORMATION AND CORRESPONDENCE

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ExxonMobil Oil Corporatio* - 3 - • 25 November 2008 75 E. Alpine Ave., Stockton • As indicated above, installation of wells MW-8 and DW-4 may postponed until offsite access is given; however, when these wells are installed, I recommend that they be relocated closer to CPT-4, unless additional technical documentation is provided to show the 75'-80' bgs sand unit reported at CPT-4 actually extends to CPT-5. • The Well Installation Report for DW-1 through DW-3(and if offsite access is granted, offsite wells DW-4 and MW-8) is now due 31 March 2009, per an ETIC email request for an extension received 18 November 2008. All new wells will be monitored quarterly for all constituents in the current monitoring program. The Well Installation Report shall provide a recommendation to include active remediation of contamination at your site. • If additional information is determined necessary to evaluate the feasibility of a remedial alternative, then a Workplan for a bench scale test (BST) or a pilot study (PS) is also due 31 March 2009 and may be combined with the Well Installation Report. • A Feasibility Study (FS), due 31 May 2009, shall include all data collected to date, including the new deep wells, and shall evaluate at least three active remedial technologies for probability of technical success and cost effectiveness. If a BST/PS is determined as necessary to provide data for conducting the FS, then the FS is due 45 days after completion of fieldwork approved under the BST/FS workplan. • Future fourth quarter reports shall evaluate the current monitoring program and provide a recommendation for reductions in monitoring frequencies and analyses. Those recommendations must include technical justification for the changes, and will be reviewed and approved in writing by Regional Board staff before any changes to the monitoring program are implemented. Please procure all necessary permits and easements for the wells installation, and give the San Joaquin County Environment Health Department and myself at least three working days notice prior to start of work and for any changes to the schedule. If you have any questions, you may contact me at (916) 464-4615, or I can be reached by email at jbarton@waterboards.ca.gov. JnAM ESLL. BARTON, P.G. gineering Geologist cc: Ms. Carmen Harms, SWRCB, UST Cleanup Fund, OSCA Account, Sacramento Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, 600 East Main Street, Stockton 95202 Mr. Duane and Ms. Wendy Berdt, Guido Segarini Trust, PO Box 1810, Aptos 95001 Ms. Theresa Marler, 14245 Lora Drive, #16, Los Gatos, CA 95030 Ms, Kama Herringfeld, Herum, Crabtree Brown, 2291 W. March Lane, Ste. 100, Stockton 95207 Mr. Kelly Reilly, 7808 Kelley Drive, Ste. F, Stockton 95207 Mr. Erik Appel, ETIC Engineering, 2285 Morella Avenue, Pleasant Hill 94523