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404 N Wiget Lane <br /> Walnut Creek, CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequolalabs corn <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 10-Jul-00 17 52 <br /> Volatile Organic Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunn Units Level Result %REC Lumts RPD Limit Notes <br /> Batch 0GO1003-EPA 5030B[PIT] <br /> LCS(OG01003-BS1) Prepared&Analyzed 01-Jul-00 <br /> Methyl tent-butyl ether 539 20 ug/1 500 108 70-130 <br /> Surrogate Dibromofluoromethane 490 " 500 980 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 410 500 820 50-150 <br /> LCS(OG01003-BS2) Prepared&Analyzed 02-Jul-00 <br /> Methyl tort-butyl ether 496 20 ug/1 500 992 70-130 <br /> Surrogate Dibromofluoromeihane 480 500 96.0 so-Iso <br /> Surrogate 1 2-Dichloroethane-d4 410 500 840 50-150 <br /> LCS(OG01003-BS3) Prepared&Analyzed 03-Jul-00 <br /> Methyl tat-butyl ether 439 20 ug/l 500 878 70-130 <br /> Surrogate Dibromofluoromethane Soo Soo 100 50-150 <br /> S to 1 2-Dichloroethane-d4 450 Soo 900 50-150 <br /> Spike(OG01003-MS1) Source W006568-02 Prepared&Analyzed 01-Jul-00 Q-02 <br /> Methyl tort-butyl ether 261 20 ug/1 500 240 420 60-150 <br /> Surrogate Dibromofluoromethane 490 500 9&0 50-150 <br /> Surrogate 1 1 Dichloroethane-d4 440 500 880 50-150 <br /> Matra Spike Dap(OG01003-MSD1) Source W006568-02 Prepared&Analyzed 01-Jul-00 Q-02 <br /> Methyl test-butyl ether 259 20 ug/1 500 240 380 60-150 0 769 25 <br /> Surrogate Dibromofluororieethane 480 500 960 50-150 <br /> Surrogate 1,1-Dtchloroed mie-d4 440 500 8g0 50.150 <br /> Sla Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the thorn of <br /> custody documet2 This analytical report must be reproduced in its entirety <br /> Page 8 of 11 <br />