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Sequoia 1551 Industrial Road <br /> I!D }, j San Carlos CA 94070 <br /> ,� Analytical (650)232 9600 <br /> FAX(650)232 9612 <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrateeles(I Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Unocal SS#08671,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Metbod 8260B - Quality Control <br /> Sequoia Analytical - San Carlos T <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020054-EPA 5030B ]P/T] <br /> _LCS(,2020054-BS2) Prepared&Analyzed 02/19/02 _ <br /> Methyl tent-butyl ether 493 1 0 ug/I 50 098 6-70-130 <br /> Surrogate 12-Dichloroethane-d4 533 500 107 '0-130 <br /> Surrogate Toluene-d8 458 500 916 70-130 <br /> Matrix Spike(2020054-MSI_) Source L202078-12 Prepared&Analyzed 02/15/02 <br /> Methyl tert-butyl ether 50 3 1 0 ug/l 500 2 5 95 6 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 600 500 120 70-130 <br /> Surrogate Toluene-d8 482 500 964 70-130 <br /> Matrix Spike Dup(2020054-NISDI) Source L202078-12 Prepared&Analyzed 02/15/02 <br /> Methyl teri-butyl ether 51 0 1 0 ugA 500 25 970 60-140 1 38 25 <br /> Surrogate 1 2-Dichloroethane-d4 597 500 119 70-130 <br /> Surrogate Toluene-d8 471 500 942 70-130 <br /> Batch 2020057-EPA 5030B 1P/T]-- _ <br /> Blank(2020057-BLKI) _ Prepared&Analyzed_02/20/02 <br /> Ethanol ND 500 119/1 !_ <br /> 1,2-Dibromoethane ND 1 0 " <br /> 1,2-Dichloroethane —ND— 1-0= - __— <br /> Di-isopropyl ether ND 1 0 " <br />—Ethyl tert-butyl ether - - ND= —_- 1'0 - " - - - -- - -- - ----- - - - - - — - - <br /> Methyl tert-butyl ether ND 1 0 " <br /> Teri-aiiiyl methyl ether - �T- - - ND 10 -- T-- -- - - -T <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 12-Dichloroethane-d4 486 50 0 972 70-130 <br /> Surrogate Toluene-d8 494 500 988 70-130 <br />_ q <br /> Sequoia Analytical-San Carlos The iesults in this i epoit apply 10 the samples analyzed in accordance with the c <br /> of custody document This analytical i eport must be reproduced in its entirety <br /> Page 9 of 16 <br />