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09/04/1998 13:21 5720916 GEOANALYTICAL LAB PAGE 15 <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# J245-07 Date: 9/4/98 <br /> Lab ID Dates Analyzed: 09/03/98 <br /> Wright Environmental Services, Inc. Method: 8260 <br /> 67 E 10th Street <br /> Tracy CA 95376 <br /> Samples Analyzed: J21546-J21555 <br /> Sample Spiked: 121551 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> % Duplicate% <br /> Methyl tert-Butyl Ether 97.2 97.4 0.2 ND <br /> Di isopropyl Ether 98.9 101.0 2.1 ND <br /> Ethyl tert-Butyl Ether 98.1 98.1 0.0 ND <br /> tert-Amyl Methyl Ether 98.3 98.7 0.4 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />