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1 Industrial Road <br /> a_ _� Sequoia Sann C Carlosrlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(65D)232-9612 <br /> www sequoialabs com <br /> ler-Ryan/Geostrategies(I Project Unocal(4) L208033 <br /> f Sierra Court,Suite J Project Number Former Unocal 40187 Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 08/29/0207 10 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified,BTEXM by EPA 8021B - Quality Control <br /> Sequoia Analytical - Morgan H111 <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Notes <br /> Batch 2H2O039-EPA 5030B JP/TJ <br /> Batch 2H2O041 -EPA 5030B PIT <br /> Blank (2H2O041-BLK1) Prepared&Analyzed 08/20/02 <br /> Gasoline Range Organics(C6-C10) ND 50 us/] <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl ten-butyl ether ND 25 " <br /> Surrogate a a,a-Triuoroioluene 114 100 114 70-130 <br /> Laboratory Control Sample(21.20041-13SI) - Prepared&Analyzed 08/20/02 V ` <br /> Be ene 108 0 SO ugA 100 108 70-130 <br /> e 106 0 50 100 106 70-130 <br /> Et y benzene 103 0 50 100 103 70-130 <br /> Xylenes(total) 305 050 300 102 70-130 <br /> Surrogate a a,a-Triuorotoluene 108 100 108 70-130 <br /> Laboratory Control Sample(2H2O041-BS2) Prepared&Analyzed 08/20/02 <br /> Gasoline Range Organics(C6-C10) 266 50 ug/l 250 106 70-130 <br /> Surrogate a,a,a-Triuormoluene 736 100 73 6 70-130 <br /> Laboratory Control Sample Dup(1H2O041-BSDI) Prepared 0.8120/02 Analyzed 08/21/02 <br /> Benzene 12 5 0 50 ug/l 10 0 125 70-130 14 6 25 <br /> Toluene 117 0 50 100 117 70-130 9 87 25 <br /> Ethylbenzene 113 0 50 100 113 70-130 926 25 <br /> Xylenes(total) 339 050 300 113 70-130 106 25 <br /> Surrogate a a a-Triuorotoluene 110 100 110 70-130 <br /> la Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 26 of 36 <br />