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819 Sinker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> 1 Analytical w-w scq 6) labs2 1 co 0 <br /> www sequoialabs com <br /> GtWyan-Dublin Project Former Unocal 0187,Stockton,CA 5302221 <br /> 6747 Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19 02 <br />-Yasollne (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 Limit Notes <br /> Batch 3020192-EPA 5030E(P/T <br /> Laboratory Control Sample(3020192-BSI) Prepared&Analyzed 02/13/03 <br /> Surrogate a,a,a-Triuorotoluene 128 49/1 100 118 60-140 <br /> Laboratory Control Sample(3020192-BS2) Prepared&Analyzed 02/14/03 <br /> Benzene 106 050 ug/I 100 106 70-130 <br /> Toluene 109 050 100 109 70-130 <br /> Ethylbenzene 11 1 050 100 111 70-130 <br /> Xylenes(total) 31 8 050 300 106 70-130 <br /> Methyl tert-butyl ether 13 0 20 " too 130 70-130 <br /> Surrogate a,a a-Tri/luorotoluene 11 7 100 117 60-140 <br /> Am L tory Control Sample(3020192-BS3) Prepared&Analyzed 02/20/03 <br /> Benzene 892 050 u8/1 too 89 70-130 <br /> Toluene 104 050 too 104 70-130 <br /> Ethylbenzene 107 050 100 107 70-130 <br /> Xylenes(total) 296 050 300 95 70-130 <br /> Methyl tert-bury]ether <br /> 992 20 too 99 70-130 <br /> Surrogate a a a-TrtJluorotoluene 11 1 " 100 111 60-140 <br /> Laboratory Control Sample Du (3020192-BSD1) Prepared&Analyzed 02/13/03 <br /> Benzene 104 050 ugll too 104 70-130 3 25 <br /> Toluene 112 050 too 112 70-130 0 9 25 <br /> Ethylbenzene 114 050 100 114 70-130 09 25 <br /> Xylenes(total) 31 7 050 300 106 70-130 2 25 <br /> Methyl tert-butyl ether 11 2 20 too 112 70-130 6 25 <br /> Surrogate a a a-Tri/luorotoluene 129 100 129 60-140 <br /> Matrix Spike(3020192-MSI) Source S302185-02 Prepared&Analyzed 02/20/03 <br /> Benzene 906 050 ugll 100 ND 91 60-140 <br /> Toluene 104 050 too ND 104 60-140 <br /> Ethylbenzene 10 9 050 too ND 109 60-140 <br /> Xylenes(total) 293 050 300 ND 98 60-140 <br /> ota 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 24 of 33 <br />