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09/07/1998 17:23 5720916 GE04NALYTICAL LAB PAGE 09 <br /> GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Report# J245-08 Date: 09/04/98 <br /> Lab ID Dates Analyzed: 9/4/98 <br /> Wright Environmental Services, Inc. Method: 8260 <br /> 67 E 10th Street <br /> Tracy CA 95376 <br /> Samples Analyzed: J21556-J21563 <br /> Sample Spiked: J21556 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> %Recovery Duplicate% Percent <br /> Recovery Difference(%) <br /> Methyl tert-Butyl Ether 105.7 111.8 5.6 ND <br /> Diisopropyl Ether 106.1 111.7 5.1 ND <br /> Ethyl test-Butyl Ether 107.2 112.3 4 7 ND <br /> tert-Amyl Methyl Ether 105.6 113.1 6.9 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification 0 1157 Laboratory Director <br />