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."Y'� � 1551 lrlos c a]Road <br /> Sequoia San Carlos CA 94070 <br /> qw Analytical (650)232-9606 <br /> FAX(650)232-9612 <br /> www stquoialabs wm <br /> Gettler-Ryan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court, Suite J Project Number Former Unocal#2859,Stockton - ReporteE17 Dublin CA, 94568 Project Manager- Deanna Harding 05/30/02 1 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunt Units Level Result %REC Limits RPD Lunt ?dotes <br /> Batch 2050035-EPA 5030B IP/Tl <br /> LCS(2050035-BS2) - - Prepared&Analyzed 05/20/02 <br /> Methyl tert-butyl ether 462 10 ugA 500 924 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 484 500 968 70-130 <br /> Surrogate Toluene-d8 539 500 108 70-130 <br /> Matrix Spike(2050035-MSI) Source L205053-05 Prepared&Analyzed 05/17/02 _ <br /> Methyl tert-butyl ether 126 10 ug/l 500 82 880 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 456 500 912 70-130 <br /> Surrogate Toluene-d8 487 500 974 70-130 <br /> Matrix Spike Dup(2050035-MSDI)___ Source L205053-05 _ Prepared&Analyzed 05/17/02 <br /> Methyl ten-butyl ether 13I 10 ug/l 500 82_ 980 60-140 389 25 <br /> Surrogate 12-Dichloroethane-d4 467 11 500 934 70-130 <br /> Surrogate Toluene-d8 473 500 946 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 19 of 20 <br />