SITE INFORMATION AND CORRESPONDENCE

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Mr. Curt Richards • - 5 - 9 June 2008 Olin Chlor Alkali Products documents the monitoring event. Items C, H, and I of the final MRP are only necessary in the event that a wellhead treatment system or systems are installed in the future. Item D of the final MRP will remain because field logs are always required field protocol and should necessitate limited effort to include in reports. Item F of the final MRP is an informational item that will not change from quarter to quarter, unless new wells are installed. 4) Annual reporting requirements. Items D, M, and N of the final MRP are only necessary in each annual report in the event that a wellhead treatment system or systems are installed in the future. Item O of the final MRP must be addressed each year as part of the evaluation of progress towards completion of cleanup and closure of the site environmental file. In a letter dated 17 August 2007, Secor updated the status of former industrial water supply well AP-2 discussed at the 6 March 2007 meeting and in the 10 July 2007 cover letter to the draft MRP. The well was disconnected from the water supply network at the Pioneer Facility, and as of 20 July 2007 will be used for groundwater monitoring purposes only. In an electronic mail dated 10 October 2007, Secor notified Pioneer and the Regional Water Board that Dietz Construction had installed the new Pombo well during the week of October 8. The well was reported to be approximately 500 feet deep with a cement seal from the surface to 200 feet. The hydrostatic head was reported to be at 116 feet below ground surface. Apparently, Dietz Construction was to collect a water sample for laboratory analyses of drinking water quality parameters required by the San Joaquin County Department of Public Health. In addition, the sample would be analyzed for chloroform and carbon tetrachloride. The Regional Water Board has not received a report of the well installation or laboratory analyses results. Schedule Well construction data for the new domestic water supply well at the Pombo property and the laboratory analysis report on the groundwater sample collected after construction must be submitted to the Regional Water Board within 14 days from the date of this letter. If you have any questions, please contact Jim Brownell at (916) 464-4675, or by email at jbrownell@waterboards.ca.gov. ROBERT BUSBY, P.G., 6/E.G. Senior Engineering Geologist Site Cleanup Unit Chief Enclosure: Final Monitoring and Reporting Program cc: Harlin Knoll, San Joaquin County Health Department, Stockton Eva Hey, Secor International Incorporated, Lafayette Jeff Inkes, Pioneer Americas LLC, Tracy Maurice Benson, Defense Logistics Agency, Tracy