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819 Striker Ave Ste 8 <br />(DSacramento 95834 <br /> Sequoia (916)921-9600 921-9600 <br /> FAX(916)921.0100 <br />(D Analytical www sequoialabs corn <br /> G 4W yan-Dublin Project Former Unocal 0187,Stockton,CA 5302221 <br /> 6747 Sierra Court,Ste J Project Number NIA Reported• <br /> Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19 02 <br />'asoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B - Quality Contr <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br />,Analyte Result Limit Units Level Result %REC Limits RPD Lamt Notes <br /> 3atch 3020224-EPA 5030B(PIT) <br /> Matrix Spike(3020224-MSI) Source.S302221-31 Prepared 02/18/03 Analyzed 02/19/03 <br /> Kylenes(total) 280 050 ugA 300 ND 93 60-140 <br /> Methyl tent-butyl ether 105 20 100 ND 105 60-140 <br /> Surrogate a a a-Tri luorotoluene 180 " 200 90 60-140 A-01 <br /> Matrix Spike Du (3020224-MSD!) Souree•S302221-31 Prepared 02/18/03 Analyzed 02/19/03 <br /> Benzene 895 050 ugA 10 0 ND 90 60-140 7 25 <br /> Toluene 943 050 100 ND 94 60-140 2 25 <br /> Ethylbenzene 909 050 " 10 0 ND 91 60-140 3 25 <br /> Xylenes(total) 272 050 300 ND 91 60-140 3 25 <br /> Methyl tent-butyl ether 109 2 0 100 ND 109 60-140 4 25 <br /> SO, <br /> a a a-Tr fluorotoluene 858 100 86 60-140 <br /> is Analytical - Sacramento 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 29 of 33 <br />