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California Regional Water Quality Control Board - <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Alan C.Lloyd,Ph.D. Arnold Schwaaenegger <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: httpalwwwswrcb.ca, ovlrwgcb5 <br /> Protection 11020 Sun Censer Drive#200 Raneho CordovFft <br /> Phone(916)464-3291 <br /> VEECF1'V1&D <br /> 8July 2005 AUG 3 0 9005 JUL t 1 2005 <br /> Mr.Dale Gillespie ENVIRONMENT HEALTH <br /> Geweke Land Development and Marketing PERMIT/SERVICES <br /> PO Box 1210 <br /> Lodi,CA 95241 <br /> REPORT REVIEW,CLEANUP AND ABATEMENT ORDER(CAO)NO.93-701, <br /> GEWEKE PROPERTY, 16 SOUTH CHEROKEE LANE,LODI,SAN JOAQUIN COUNTY <br /> I reviewed the I July 2005 Ozone Injection Pilot Test Report(Report), submitted on your behalf by Advanced <br /> GeoEnvironmental,Inc. (AGE). The Report provides a compilation and professional interpretation of the <br /> analytical results from a 24-week ozone injection pilot test conducted between October 2004 and March 2005 at <br /> your site. The Report states groundwater Oxidation Reduction Potential and Dissolved Oxygen levels increased <br /> at monitoring well MW-4,located within the influence of ozone injection wells OW-2 and OW-3,with a <br /> corresponding reduction in petroleum hydrocarbons concentrations in MW-1 and MW-4 for Total Petroleum <br /> Hydrocarbons as gasoline, 1,000 Rg/L to<50 RglL,and 65 to<50 pg/L; as well as benzene, 8.1 RglL to<0.5 <br /> RglL,and 0.68 to<0.5 RglL),respectively. Conversely,the dissolved plume of the fuel scavenger 1,2- <br /> dichloroethane(1,2-DCA)did not show a declining trend in concentrations site-wide,nor did the petroleum <br /> hydrocarbon plume outside of the influence of OW2 and OW-3. The Report revealed no adverse effects to water <br /> quality as a result of ozone injection. The Report recommends: <br /> • Continued operation of ozone injections wells OW-2 and OW-3, <br /> • Installation of four additional ozone injection wells to address the dissolved petroleum hydrocarbon <br /> groundwater plume(enclosed Figures 2,4, and 6),and <br /> • Reinstallation of ozone injection well OW-1,which did not function due to improper installation. <br /> While oz6ne injection does not appear to be effective for reducing 1,2-DCA plume concentrations,the reductions <br /> in petroleum hydrocarbon concentrations indicates that ozone injection is warranted as recommended in the <br /> Report. Therefore,I concur to the Report recommendations stated above. Note that the Workplan for the ozone <br /> well installations was approved by my letter of 29 December 2003,and modified by my letter of 18 November <br /> 2004. Please provide a report of the completed work by 1 September 2005. If you have any questions you may <br /> contact me at(916)464-4615 or bartonj a rb5s.swrcb.ca.eov. <br /> James L.Barton,P.G. <br /> Enclosures <br /> cc: Mr.Mark Owens,UST Cleanup Fund,SWRCB, Sacramento <br /> Mr. Harlin Knoll,San Joaquin County Environmental Health Division,Stockton <br /> Mr.Robert Marty,Advanced GeoEnvironmental,Incorporated,Stockton <br /> California Environmental Protection Agency <br /> rd Recycled Paper <br />