ARCHIVED REPORTS_VAPOR INTRUSION SURVEY - SOIL GAS SAMPLING REPORT

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r ' Former Columbo/Toscana Bakery - 3 - 23 December 2008 1444 S. Lincoln St., Stockton r since October 2006 (441 W. Charter Way), 2) currently installing a full scale SVE/AS system after completion of a pilot study (1426 S. Lincoln St.), and 3) have a scheduled 2009 pilot study comparison of AS versus BioS (515 W. Charter Way)). r Since the AS and BioS technologies can use the same type of air injection wells and equipment, I strongly suggest that you continue to review the Geotracker monitoring and remediation reports available for these three sites. A workplan for a pilot study r of the Report recommended remedial option (BioS), or another highly rated technology, is due no later than 1 April 2009. r 2. The Email stated "PSC prefers to implement the Work Plan after the plume is better defined...", although the Report shows the results of extensive investigations in 2007 and 2008. The Email statement that offsite dissolved sources may be a r significant contribution to vapor intrusion threats, contradicts the Report conclusion that the majority of soil contamination related to your site release is now submerged below the water table, due to the ten foot rise in groundwater since 1997. r Regardless of these statements, the evaluation of vapor intrusion is a matter of human health that should not be delayed for one year. The SVI data are necessary and appropriate to determine if the site occupants are at risk from vapor intrusion r potentially emanating from the site USTs source area into the building. The SVI Report for your site is due no later than 1 April 2009. r 3. Current requests to further delay all investigation and remediation until Sara Lee receives a SWRCB CPA LOC are not acceptable. However, if Sara Lee provides written documentation showing a true fiscal hardship that most probably will result in r an inability to meet the required deadlines, then Regional Board staff will consider reasonable requests for future extensions. Please secure all necessary local drilling permits prior to conducting the SVI, and provide the rSan Joaquin County Environmental Health Department and myself at least three working days notice prior to initiating the fieldwork. If you have any questions, you may call me at (916) 464- 4615 or email me at jbarton@waterboards.ca.gov. rJames L L. Barton, P.G. Engineering Geologist rcc: Ms. Jennifer Jordan / Ms. Judy Reid, SWRCB UST Cleanup Fund, Sacramento Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton r Mr. Edward Overton, P.O. Box 417, French Camp 95231 Mr. Paul Anderson, PSC Environmental Services, 210 W. Sand Bank Rd., Columbia, IL 62236 r r r