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Mr. Larry Higinbotham .. <br /> Thrifty Station #172 <br /> Page 3 of 3 <br /> A work plan to install two ozone sparge points was included in the Plan. As <br /> alluded to above, the CVRWQCB must evaluate the site for WDRs based on the <br /> results from a BST or geochemical evaluation. Some minerals and metals react <br /> with ozone and some UST sites have had adverse reactions with ozone injection. <br /> The proposal to install ozone sparge points and to conduct a pilot test cannot be <br /> approved until additional soil characterization noted above and the results of a <br /> BST have been evaluated. If you are going to move forward with ozone injection, <br /> submit a work plan to collect soil and groundwater samples and to conduct a <br /> BST to the EHD by 01 December 2006. <br /> If the data in the report of findings for the BST support the use of ozone as an <br /> effective remedial alternative and the CVRWQCB has approved your BST, you <br /> may submit a RAP addendum to EHD with site-specific details for the installation <br /> of the ozone sparge wells and support equipment. For your information, at least <br /> 12 sites in San Joaquin County have ozone remediation systems in operation <br /> addressing impacted groundwater; all have operated more than a year , some as <br /> long as 4 years, none have received site closure to date. <br /> Two conductor casings were set between the USTs to drill and install <br /> remediation wells, if needed, and/or to collect post remedial soil samples to <br /> confirm remedial effectiveness. EHD recommends that these conductors be <br /> reserved for those purposes and not be utilized for collecting the soil samples for <br /> a BST. One or two borings advanced outside the UST pit should provide suitable <br /> samples for the ozone BST evaluation. <br /> Thank you for your continued cooperation and response to EHD directives. You <br /> may contact Michael Infurna at (209) 468-3454 or by electronic mail at <br /> minfurna(c�sicehd.com should you wish to discuss the site. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Michael J. Infurna Jr., Senior REHS Nuel C. Henderson Jr., PG <br /> LOP / Site Mitigation Unit IV Engineering Geologist <br /> LOP/Site Mitigation Unit IV <br /> MI/ <br /> cc: CVRWQCB — James Barton, Sacramento <br /> SWRCB-Clean Up Fund — Mark Owens, Sacramento <br /> GeoHydrologic Consultants, Inc. — Richard Vogel, 5912 Bolsa Avenue <br /> Suite 200, Huntington Beach CA <br /> 92649 <br />