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04/03/1998 16:53 5720916 GEOANALYTICAL LAB PAGE 05 <br /> GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Phone (209) 572-0900 <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> Reportf J063-07 Date: 3/26/98 <br /> Lab ID Dates Analyzed: 3/16/98 <br /> Wright Environmental services, Inc. Method: 8260 <br /> 4220 Commercial Drive M5 <br /> Tracy CA 95376 <br /> Samples Analyzed: J20329-J20337,J20340,120345 <br /> Sample Spiked: J20329 <br /> Analyte Matrix Spike Matrix Spike Relative Blank <br /> % Duplicate% Percent <br /> Difference(%) <br /> Methyl tert-Butyl Ether (MTBE) 108.1 110.1 1.8 ND <br /> Di-isopropyl Ether 107.3 109.2 1.9 ND <br /> Ethyl tert-Butyl Ether(ETRE) 115.0 117.0 1.8 ND <br /> tert-Amyl Methyl Ether (TAME) 112.4 114.4 1.8 ND <br /> Richard Meissner Donna Keller <br /> Chemist Certification M 1157 Laboratory Director <br />