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04/20/2004 10:06 2095720916 GE0 PAGE 20/24 <br /> GeoAnalytical Laboratories, Inco <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone(209) 572-0900 Pax (209) 572-0916 <br /> Report# Q103-03 QC REPORT <br /> Wright Environmental Services Dates Analyzed 04/09/04 <br /> 67 E 10th Street <br /> Tracy CA 95376 <br /> LCS MS% MSD % RPD Blank <br /> Analyte Batch # Method %Recovery Recovery Recovery <br /> Methyl tertiary-Butyl Ether V00126 8260B 83.0 113.5 66.0 52.9 ND <br /> Di-isopropyl Ether(DIPS) 90.3 100.5 95.5 5.1 ND <br /> Benzene 89.5 100.3 102.0 1.7 ND <br /> tertiary-Amyl Methyl Ether 89.5 102.5 104.5 1.9 ND <br /> Toluene 101.0 123.3 116.3 5.8 ND <br /> Comments: <br /> QC out of limits-spiked on high background, LCS within limits. <br /> larlo D of Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />