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404 N Wiget Lane <br /> Sequoia Walnut Creek C94598 <br /> (925)9888-9600 <br /> 4INFAX(925)988-%73 <br /> Analytical www sequolalabs com <br /> I6Gettler Ryan,Inc -Dublin Project Chevron <br /> 747 Sierra Court Suite J Project Number Chevron#9-2033 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 04-Sep-01 11 14 <br /> MTBE Confirmation 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 1 H24033- EPA 5030B(P/T) <br /> Blank(IH24033-BLKI) Prepared&Analyzed 23-Aug-01 <br /> Methyl tert-butyl ether(MTBE) ND 20 ug/1 <br /> Surrogate Dibromofluoromethane 268 250 107 50-150 <br /> Surrogate 1 2-Dichloroethane44 214 250 856 50-150 <br /> Blank(IH24033-BLK2) Prepared&Analyzed 29-Aug-01 <br /> Methyl tert-butyl ether(MTBE) ND 20 ug/1 <br /> Surrogate Dibromofluoromethane 440 Soo 880 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 530 500 106 50-150 <br /> LCS(I H24033-BS 1) Prepared&Analyzed 23-Aug-01 <br /> Methyl tort-butyl ether(MTBE) 202 20 ugA 250 808 70-130 <br /> Surrogate Dibromoflucromethane 279 250 112 50-150 <br /> 0ogate 1 2-Dichloroethane-d4 210 250 840 50-150 <br /> S(IR24033-BS2) Prepared&Analyzed 29-Aug-01 <br /> Methyl tert-butyl ether(MTBE) 431 20 ug/l Soo 862 70-130 <br /> Surrogate Dibromofluoromethane 460 Soo 910 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 520 500 104 50-150 <br /> LCS Dup(IH24033-BSDl) Prepared 23-Aug-01 Analyzed 24-Aug-01 <br /> Methyl tert-butyl ether(MTBE) 192 20 ug/l 250 768 70-130 508 25 <br /> Surrogate Dibromofluoromethane 263 " 250 105 50-150 <br /> Surrogate 1,2-Dichlorcethane-d4 201 250 804 50-150 <br /> uoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 14 of 26 <br />