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Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Wednesday, May 27, 2009 4:20 PM <br /> To: 'Kirk Larson' <br /> Subject: Site at 3250 West Hammer Lane, Stockton, California <br /> Kirk: <br /> The Underground Storage Tank Cleanup Fund (Fund)concurs with the San Joaquin County Environmental <br /> Health Department(EHD)directive to conduct ozone injection.. By letter dated June 30, 2008, the EHD <br /> conditionally approved the installation of an ozone microsparge system, contingent upon first performing an ozone <br /> bench-scale test. By letter dated December 31, 2008, the EHD approved the Addendum to Work Plan for Bench- <br /> scale Test and Injection Well Installation, dated November 1.7, 2008. Then on February 6, 2009, Stratus <br /> Environmental, Inc. (Stratus), the consulting firm:retained by the responsible party for the above-referenced <br /> site, notified the EHD by e-mail that due to delays in reimbursement form the Fund, fieldwork associated with the <br /> implementation of the ozone-bench-scale test has been delayed. The EHD responded by letter dated February <br /> 27, 2009, and notified the responsible party that further delays are not acceptable. The EHD recommended <br /> collecting groundwater samples from monitoring wells screened in the same depth interval as the ozone injection <br /> wells and down gradient of the injection.wells at the adjacent ConocoPhillips 76 site where an ozone injection <br /> system has been in operation since May 2004. The EHD suggested that an ozone bench-scale study may not be <br /> necessary if analytical results indicate that groundwater quality will not be adversely affected, and if it can be <br /> demonstrated that this site and the adjacent ConocoPhillips 76 site have similar hydrogeological characteristics. <br /> The EHD is currently awaiting a response to this recommendation. If the responsible party complies with the <br /> recommendation presented by the EHD,the ozone system could be operating by the end of 2009. <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton,California 95202 <br /> Phone: (209)468-9852 <br /> Fax: (209)468-3433 <br /> Email: vmccartney&jcchd.com <br /> 5/27/2009 <br /> L <br />