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Sequoia 1551 Industria!Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical. FAX(650)232-9612 <br /> www.sequoialabs.com <br /> -r-Ryan/Geostrategies(1} Project: Tosco(1) , <br /> Sierra Court,Suite J Project Number: Unocal SS#08671,Stockton,CA Reported: <br /> Dublin CA.94568 Project Manager: Deanna Harding 09/05/01 07:36 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br />� 1 <br /> Sequoia Analytical - San Carlos ` <br /> t <br /> Reporting Spike Source %REC RPD r <br /> Analyte Result Limit Units Level Result %R-EC Limits RPD Limit Notes <br /> Batch 1080101 - EPA 5030B P/TJ <br /> LCS(1080101-BS2) Prepared&Analyzed:08/24/01 <br /> Methyl tert-butyl ether 44.6 2.0 ugll 50.0 89.2 70-130 <br /> Surrogate: l,2-Dichloroethane-d4 44.2 50.0 88.4 76-114 <br /> Surrogate: Toluene-d8 46.4 50.0 92.8 88-110 } <br /> t <br /> Matrix Spike(1080101-NISI) Source: L108144-04 Prepared&Analyzed:08/24/01 } <br /> Methyl tert-butyl ether 45.7 2.0 ugll 50.0 ND 91.4 60-140 1 <br /> Surrogate:l,2-Dichloroethane-d4 45.7 50.0 91.4 76-114 <br /> Surrogate:Toluene-d8 46.4 50.0 92,8 88-110 <br /> Matrix Spike Dup(1080101-MSDI) Source: L108144-04 Prepared&Analyzed:08/24/01 <br /> Methyl tent-butyl ether 45.1 2.0 ugll 50.b ND 90.2 60-140 1.32 25 <br /> Surrogate:l,2-Dichloroethane-d4 44,8 50.0 89.6 76-114 <br /> Surrogate:Toluene-d8 46.0 50.0 92.0 88-110 <br /> J <br /> } <br /> I <br /> I <br /> r <br /> SLINia Analytical - San Carlos The results in this report apply to the samples analyed in accordance with the chain of i <br /> custody document. This analytical report must be reproduced in its entirety. <br /> a r <br /> Page 9 of 10 <br /> I k � <br /> 1 <br />