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r <br /> 1551 Industrial Road <br /> Sequoia San Carlos CA 94070 <br /> ,!ZN (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> TOW www sequoialabs corn <br /> ler-Ryan/Geostrategies(I) Project Tosco(l) <br /> Sierra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/21/02 13 26 <br /> GasolinelBTEMOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical Sacramento <br /> Reporting Spike Source %REC RFD <br /> Analyte Result Litnit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050122 -EPA 5030B WTI <br /> Matrix Spike(2050122-MSI) Source S205099-13 Prepared&Analyzed 05/15/02 <br /> Benzene 3 19 0 50 ug/I 3 35 ND 95 70-130 <br /> Toluene 190 0 50 202 ND 94 70-130 <br /> Methyl tert-butyl ether 509 050 545 ND 93 60-140 <br /> Gasoline(C6-C 10) 222 50 275 ND 81 60-140 <br /> Surrogate 1 2-DCA-d4 242 250 97 60-140 <br /> Surrogate Toluene-d8 238 250 95 60-140 <br /> Surrogate 4-BFB 214 250 86 60-140 <br /> Matrix Spike Du (2050122-MSD1) Source S205099-13 Prepared&Analyzed 05/15/02 <br /> Benzene 3 12 0 50 ug/l 3 35 ND 93 70-130 2 25 <br /> Toluene 184 050 202 ND 91 70-130 3 25 <br /> Methyl teri-butyl ether 496 0 50 5 45 ND 91 60-140 3 25 <br /> Gasoline(C6-C10) 211 50 275 ND 77 60-140 5 25 <br /> *te 1 1-DCA-d4 23 7 II 2-50 95 60-140 <br /> ate Toluene-d8 230 2.50 92 60-140 <br /> Surrogate 4-BFB 206 250 82 60-140 <br /> S is Analytical -San Carlos The results in this 1 eport apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirery <br /> Page 12 of 13 <br />