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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Report# J252-09 Date: 09/11/98 <br /> Lab ID Dates Analyzed: 09/09/98-09/10/98 <br /> Wright Environmental Services, Inc. Method: 8260 <br /> 67 E 10th Street <br /> Tracy CA 95376 <br /> Samples Analyzed: J21618-J21626 <br /> Sample Spiked: Blank <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> %Recovery Duplicate% <br /> Methyl tert-butyl Ether 90.0 94.9 5.3 ND <br /> Di isopropyl Ether 85.5 88.7 3.7 ND <br /> Ethly tert-Butyl Ether 87.2 90.4 3.6 ND <br /> tert-Amyl Methyl Ether 90.1 93.7 4.0 ND <br /> Sylvia Krenn Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />