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tD— <br /> Sequoia 155] l losC a94070 San Carlos CA 94D74(650)232-9600 <br /> mqAnalytical FAX(650)232-9612 <br /> www sequoialabs com f <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(l) <br /> 6747 Sierra Court, Suite j Project Number Tosco(Unocal)SS#6981, Stockton,CA Reported ' <br /> Dublin CA,94568 Project Manager Deanna Harding 12/27/01 09 39 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Metbod_8260B_- Quality_Control <br /> Sequoia Analytical - San Carlos -- <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120090-EPA 5030B JP/TJ <br /> LCS(1120090-BS2) Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether 512 10 ugA 500 102 70-130 <br /> Surrogate 12-Dichloroeihane-d4 467 500 934 70-130 <br /> Surrogate Toluene-d8 558 500 111 70-130 <br /> Matrix Spike(1)20090-MSI) Source L112107-0_6_ Prepared &Analyzed 12/26/01 <br /> Methyl tert-butyl ether 51 9 10 ug/t� 500 ND 104 60-140 <br /> Surrogate 1,1-Dichloroethaned4 453 500 906 70-130 <br /> Surrogate Toluene-d8 561 560 112 70-130 <br /> Matrix Spike Dup(1120090-MSDI) Source L112107-06 Prepared&Analyzed 12/26/01 <br /> Methyl ten-butyl ether 517 1 0 ug/1 500 ND 103 60-140 0 966 25 <br /> Surrogate 12-Dichloroethane-d4 452 500 904 70-130 <br /> Surrogate Toluene-d8 557 500 111 70-130 <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyaed to accordance with the chain 0Jw <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 21 of 22 <br />