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California Retonal Water Quality Antrol Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Terry Tamminen <br /> Arnold <br /> Secretary for Sacramento Main Office enegger <br /> Goovernovernochwarr <br /> Environmental Internet Address: http://wwwswrcb.ca.gov/rwgc65 <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 Fax(916)464-4797 w n E C� ��V//](�D <br /> 17 March 2004 MAR 18 \2010��4 <br /> ENVIRONMENT HEALTH <br /> Ms. Julie Raming PERMIT/SERVICES <br /> Environmental Affairs <br /> Georgia-Pacific Corporation <br /> P.O. Box 105605 <br /> Atlanta, GA 30348 <br /> REVIEW OF AIR/OZONE SPARGE PILOT TEST REPORT, FORMER GEORGIA-PACIFIC <br /> CORPORATION CHEMICAL PACKAGING PLANT, 75 WEST VALPICO ROAD, TRACY, <br /> SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board) has reviewed the <br /> 8 March 2004 Air/Ozone Sparge Pilot Test Summary Report for In-Situ Treatment of Chloroform in <br /> Ground Water(Repot) submitted by Acton Mickelson Environmental, Inc. on behalf of Georgia-Pacific <br /> Corporation(GPC) for the former chemical packaging facility at 75 West Valpico Road in Tracy(site). <br /> The Report discusses the installation of 12 air/ozone sparge points used to conduct a two-month pilot <br /> study of air/ozone injection. Based on the sampling results from monitoring wells MW-21, MW-22, and <br /> MW-23, GPC recommends continuing to evaluate the effectiveness of the air/ozone injection system by <br /> monitoring MW-22 monthly and MW-21 quarterly until chloroform concentrations decrease. The <br /> Report notes that there is enough permeability for the air/ozone injection system to work and that <br /> plugging of the sparge points was not observed. <br /> The Report does not include a discussion of how much of a decrease in chloroform concentrations will <br /> conclude the pilot test and warrant the reducted sampling frequency. Regional Board staff concurs with <br /> the proposed monitoring,provided that GPC provides clear guidelines for decreasing the sampling <br /> frequency. By 16 April 2004, please submit a response regarding the proposed guidelines for reducing <br /> the air/ozone sparge system monitoring,which may be done by email. The next monitoring report is due <br /> by 1 May 2004 and it should include an evaluation of the air/ozone sparge system and continue to <br /> provide the graphs that show chloroform concentrations trends as provided in Figures 6, 7, and 8 of the <br /> Report. If you have any questions, you may contact me at (916)464-4719 or by email at <br /> lewisd@rb5s.swrcb.ca.gov. <br /> DEVRA LEWIS <br /> Environmental Scientist <br /> cc: Mr. Mike Infuma, San Joaquin County Health Department, Stockton <br /> Mr. Robert L. Hammond, Acton Mickelson Environmental, Inc., El Dorado Hills <br /> California Environmental Protection Agency <br /> rZa Recycled Paper - - <br />