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7.71 <br /> • r ,j <br /> GeoAnal tical Laboratories, Inc. <br /> 1405 Kansas Avenge Phone (209) 572-0900 <br /> F <br /> Modesto, CA 95351 FAX (209) 572-0916 <br /> QC REPORT <br /> 1' <br /> Report# K006-23 Date: 1/13/99 <br /> Dates Analyzed: 01/12/99 <br /> Wright Environmental Services, Inc. Method: 8260 <br /> 67 E 10th Street <br /> I Tracy CA 95376 <br /> i. Samples Analyzed: K20024, K20025, K20026, K20027, K20028, K20029 <br /> Sample Spiked: K20053 <br /> Analyte Matrix Spike Matrix Spike RPD Blank <br /> %Recovery Duplicate % <br /> Recovery <br /> i <br /> Methyl tertiary-Butyl Ether 93.8 89.8 4.4 ND <br /> Di-isopropyl Ether 90.5 87.1 3.9 ND <br /> Ethyl tertiary-Butyl Ether 85.9 86.5 0.7 ND <br /> tertiary-Amyl Methyl Ether 94.5 92.1 2.6 ND <br /> i <br /> Sylvia Krenn Donna Keller <br /> Cnemis; Certification 4 11,371 Laoora�ory Director <br />