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1551 Indusinal Road <br /> a Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> �lAnalytical FAX(650)232-9612 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategies(1) Project Tosco(1) <br /> Sierra Court,Suite J Project Number Tosco#15886,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/06/01 16 51 <br /> Volatile Organic S Oxygenated Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Notes <br /> Batch l 110100-EPA 5030B JP/TJ <br /> LCS(1110100-BSI) Prepared&Analyzed 11/28/01 <br /> Methyl tert-butyl ether 561 10 ug/l 500 112 70-130 <br /> Surrogate 12-Dichloroethane-d4 265 250 106 70-130 <br /> Surrogate Toluene-d8 247 250 988 70-130 <br /> LCS(ll 10100-BS2) Prepared&Analyzed 11/29/01 <br /> Methyl tert-butyl ether 507 1 0 ugA 500 101 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 272 250 109 70-130 <br /> Surrogate Toluene-d8 247 250 988 70-130 <br /> Matrix Spike(I 110100-MSI) Source L111140-10 Prepared 11/_28/01 Analyzed 11/29/01 <br /> Methyl tert-butyl ether 462 10 ugll 500 ND 924 60-140 <br /> Surrogate I 1-Dichlorcethane-d4 237 250 948 70-130 <br /> Surrogate Toluene-d8 241 250 964 70-130 <br /> x Spike Dup(1110100_MSDI) Source L111140-10 Prepared 11/28/01 Analyzed 11/29/01 <br /> N yl tert-butyl ether 476 10 ug/l Soo ND 952 60-140 299 25 <br /> Surrogate 1,2-Dtchloroethane-d4 243 250 972 70-130 <br /> Surrogate Toluene-d8 246 250 984 70-130 <br /> la Analytical-San Carlos The results in this report apply to the samples anabaed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 22 of 23 <br />