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404 N Wiget lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> FAX <br /> Analytical www seququailabs alabs c 73 <br /> coin <br /> r�ettleran,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-6258 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 27-Jul-01 10 47 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G20011 - EPA 5030B(PIT) <br /> Blank(I C2001 1-BLK2) Prepared&Analyzed 24-Jul-01 <br /> Ethanol Nr) 500 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl cert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 469 500 938 50-150 <br /> Surrogate 11-Dichloroethane-d4 445 500 890 50-150 <br /> LCS(IG20011-BS2) Prepared&Analyzed 24-Jul-01 <br /> Methyl tert-butyl ether 501 20 ug/I 500 100 70-130 <br /> gate Dibromofluoromethane 538 „ 500 108 50-150 <br /> Afto <br /> gate 1,1-Dichloroethane-d4 524 500 105 50-150 <br /> Matrix Spike(IC20011-MSI) Source.W107223-04 Prepared&Analyzed 24-Jul-01 <br /> Methyl tort-butyl ether 479 20 ug/I 500 ND 959 60-150 <br /> Surrogate Drbromofluoromethane 493 500 986 50-150 <br /> Surrogate 12-Dichloroethane-d4 467 500 934 50-150 <br /> Matrix Spike Dup(1G2001I-MSDI) Source W107223-04 Prepared 24-Jul-01 Analyzed 25-Jul-01 <br /> Methyl tert-butyl ether 586 20 ug/l Soo ND 117 60-150 20 1 25 <br /> Surrogate Dibromofluoromeihane -540 500 108 50-150 <br /> Surrogate I 1-Dtchloroethane-d4 520 500 104 50-150 <br /> oia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Ars analytical report must be reproduced in its entirety <br /> Page 10 of 12 <br />