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t <br /> 1551 Industnal Road <br /> Sequoia San Carlos CA 94070 <br /> Analytical (650)232 9600 <br /> r www sequoialabs colm <br /> 41 er-Ryan/Geostrategtes(1) Project Tosco(l) <br /> Sierra Court, Suite I Project Number Tosco(Unocal)SS#6981,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/27/0109 39 <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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120084-EPA 5030B IP/T <br /> Blank(1120084-BLKI) Prepared&Analyzed 12/21/01 <br /> Surrogate Toluene-d8 273 119/1 250 109 70-130 <br /> LCS(1120084-BSI) _ _ _ Prepared&Analyzed 12/21/01 <br /> Methyl lent-butyl ether 501 10 ug/I Soo 100 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 283 250 113 70-130 <br /> Surrogate Toluene-d8 268 250 107 70-130 <br /> Matrix Spike(1120084-MSI) _ _ Source L112086-03 Prepared&Analyzed 12/21/01 <br /> Methyl ten-butyl ether 534 10 ugll 500 21 103 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 292 250 117 70-130 <br /> Surrogate Toluene-d8 171 250 108 70-130 <br /> Matrix Spike Dup(1120084-MSDI) Source L112086-03 Prepared&Analyzed 12/21/01 <br /> Methyl tert-butyl ether 565 10 ugll 500 21 109 60-140 566 25 <br /> to 1,2-Dichloroethane-d4 301 250 110 70-130 <br /> Su gate Toluene-d8 271 250 108 70-130 <br /> Batch 1120086-EPA 5030B IP/TI <br /> Blank(1120086-BLKI) Prepared&Analyzed 12/2_1101 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl Cert-butyl ether ND 1 0 " <br /> Methyl ten-butyl ether ND 1 0 " <br /> Tert-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethone-d4 414 .500 828 70-130 <br /> Surrogate Toluene-d8 302 500 100 70-130 <br /> la Analytical-San Carlos The results in this report apply to the samples analysed in accordance with the chain of <br /> custody docunienl This analytical report must be reproduced in its entirety <br /> Page 18 of 22 <br />