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e. . • <br /> r i .f i �h <br /> riYl-���E rr�' <br /> 1� <br /> � IV, <br /> CLEAR['AAr1A�, ( l ,�fv �hl l Q <br /> I G R O U P <br /> December 31, 2003 <br /> Environmental Services <br /> Ms Lon Duncan <br /> Senior Registered Environmental Health Specialist <br />' San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re: Addendum to Corrective Action Plan <br /> Explanation of iSOC Technology <br /> Barnes Trucking Facility, 1817 South Fresno Avenue, Stockton, California <br /> Clearwater Project No ZB 178C <br /> San Joaquin County Site Code No 2506 <br /> Dear Ms Duncan <br /> The purpose of this letter is to provide you with information pertaining to the "iSOC" <br /> (Submerged Oxygen Curtain) remediation system proposed in our November 2002 Corrective <br /> Action Plan (CAP), prepared by Clearwater Group (Clearwater) on behalf of Barnes Trucking <br /> and Mr Floyd Barnes, for the above-referenced property (the "site") Clearwater is also <br /> providing documentation of iSOC performance at two sites with conditions similar to those on <br /> the Barnes Trucking site These documents are attached hereto as Appendix A The CAP <br /> identified enhanced bioremediation as the most favorable remedial option, depending on the <br /> I <br /> findings of a pilot study, which had not been performed as of the date of the CAP, to evaluate the <br /> intrinsic bioremedial potential at the site The pilot study consisted of the collection of additional <br /> groundwater samples, during the quarterly sampling performed during 2003, which were <br /> analyzed for hydrocarbon-degrading and heterotrophic bacteria, pH, dissolved oxygen, <br /> oxidation-reduction potential, ammonia nitrogen, ortho-phosphate, sulfate, nitrate, alkalinity, and <br /> ferrous iron The results were presented in this year's quarterly monitoring reports, and an <br />' evaluation of the results, and intrinsic bioremediation potential, was performed by CytoCulture <br /> International, Inc CytoCulture's findings indicate that sufficient bacterial populations and <br /> nutrient concentrations are present on the site, and that the conditions for natural hydrocarbon <br />' biodegradation on the site are favorable CytoCulture indicated that some depletion of bacteria, <br /> oxygen and nutrients was occurring inside the hydrocarbon plume, but that addition of oxygen <br /> and nutrients to the site would reverse that condition and enhance the biodegrading activity at the <br /> site A copy of CytoCulture's evaluation letter (Assessment of Intrinsic Bioremediation Site <br /> Conditions at Barnes Trucking Fatality) was provided in Appendix D of Clearwater's <br /> Groundwater Monitoring Report — Third Quarter 2003, which was submitted to SJC/EHD on <br /> IOctober 14, 2003 A copy of CytoCulture's evaluation letter is attached hereto as Appendix B <br /> I229 Tewksbury Avenue ♦ Point Richmond,California 94801 ♦ Telephone 510-307-9943 ♦ Fax 510-232-2823 <br />