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404 <br /> Sequoia " Wi5%, <br /> Walnut Creek CA 94598 <br /> (925)988-9600 <br /> FAX 98 <br /> Analyticalwww sequoquoialabs ctoo <br /> Gettler Ryan,Inc -Dubhn Project Chevron <br /> 6747 Sierra Court Suite 3 Project Number Chevron#9-6258 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 30-Apr-01 11 39 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunt Units Level Result %REC Limits RPD Lunt Notes <br /> Batch 1D18014-EPA 50308(PIT) <br /> LCS(1D18014-BSI) Prepared&Analyzed 18-Apr-01 <br /> Methyl tert-butyl ether 506 20 ug/I 500 101 70-130 <br /> Surrogate Drbromofluoromethane 720 500 144 50-150 <br /> Surrogate 1 2-D+chloroethane-d4 520 500 104 50-150 <br /> LCS(1D18014-BS2) Prepared&Analyzed 19 Apr-Ql <br /> Methyl tert-butyl ether 529 20 ug/I 500 106 70-130 <br /> Surrogate Drbromofluorornethane 690 500 138 50-150 <br /> Surrogate 1 1-Drchloroethane-d4 470 Soo 940 50.150 <br /> LCS(1D18014-BS3) Prepared&Analyzed 23-Apr-01 <br /> Methyl tent butyl ether 486 20 ug/l 500 972 70-130 <br /> Surrogate Drbromofluoromethane 560 500 112 50-150 <br /> Surrogate 12-Dichloroethane-d4 410 500 820 50-150 <br /> LCS Dup(1D18014-BSDI) Prepared&Analyzed 19-Apr-01 <br /> Methyl tert-butyl ether 403 20 ug/I 500 806 70-130 227 200 <br /> Surrogate Drbromofluoromethane 500 500 100 50-150 <br /> Surrogate 12-Dichloroethane d4 450 500 900 50-150 <br /> Matnx Spike(ID18014-MSI) Source W104297-02 Prepared&Analyzed 23-Apr-01 <br /> Methyl tent-butyl ether ND 20 ug/I 500 ND 60-150 <br /> Surrogate Drbromofluoromethane 0 500 50-150 <br /> Surrogate I 1-Dechloroezhaw-d4 0 500 50-150 <br /> Matrix Spike Dup(ID 18014-MSD1) Source W104297-02 Prepared&Analyzed 23-Apr-01 <br /> Methyl tert-butyl ether ND 20 ug/l 500 ND 60-150 25 <br /> Surrogate Drbromofluoromethane 0 500 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 0 500 50-150 <br /> Sequoia Analytical-Walnut Creek The resullr in this report apply to the samples analyzed in accordance with the char <br /> custody document Thrs analytical report must be reproduced in its enftreMw <br /> Page 7 of 11 <br />