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`a <br /> 4D (651551 industnal Road <br /> Sequoia San Carlos CA 94070 <br /> Analytical FAX <br /> 0)232-9600 <br /> (650)232 9612 <br /> www sequoialabs com <br /> Gettler-Ryan/GeostrateRies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/21/02 13 26 <br /> Volatile Organic S Oxygenated Compounds by EPA,Method 8260B - Quality Control <br /> - Sequoia Analytical - San Carlos <br /> Reporting - Spike Soul-cc %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050016_EPA 5030B IP/TJ <br /> LCS(2050016-BSI) - - - Prepared&Analyzed 05/08/02 - '"- <br /> Methyl tert-butyl ether 443 20 ugfl 500 88 6_70-130 <br /> Surrogate 12-Drchloroethane-d4 510 500 11)2 7n-13n <br /> Surrogate Toluene-d8 516 500 103 70-130 <br /> LCS(20500]6-BS2) - Prepared& Analyzed 05/10/0.2 <br /> Methyl tert-butyl ether 430 20 uSA 500 860 70-130 <br /> Surrogate 1,2-Drchloroethane-d4 490 500 980 70-130 <br /> Surrogate Toluene-d8 485 500 970 70-130 <br /> LCS(2050016-BS3) Prepared&Analyzed 05/13/02 <br /> Methyl tert-butyl ether 5I 1 20 ug/l 500 102 70-130 _ <br /> Surrogate 12-Dichloroethane-d4 507 500 101 70-130 <br /> Surrogate Toluene-d8 502 500 100 70-130 <br /> Matrix Spike(2050016-MSI) Source L205016-05 Prepared&Analyzed 05/08/02 <br /> Methyl Leri-butyl ether 47 1 20 ug/l 500 ND 942 60-140 <br /> Surrogate 1 1-Dichloroethane-d4 500 500 100 70-130 <br /> Surrogate Toluene-d8 512 500 101 70-130 <br /> _Matrix Spike Due(2050016-MSDI) Source L205016_05 __Prepared&Analyzed 05/08/02 <br /> �Methyl tert-butyl ether 458 20 ug/1 500 ND 916 60-140 2 80 25 <br /> ----Surrogate 12-Dichloroethane-d4— -51 U — -- - -50 0- -----101 70=130-- — - ------ <br /> Surrogate Toluene-d8 520 500 104 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 9 of 13 <br /> - - - -- I <br />