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819 Striker Ave Ste 8 <br /> 4DSequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequotalabs com <br /> r n <br /> Gettler-Ryan-Dublin Prosect Former Unocal 2859,Stockton,CA S308609 v <br /> 6747 Sierra Court,Ste ] Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 09/11/03 14 34 <br /> Gasoline (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 3090015-EPA 5030B(PIT) <br /> Laboratory Control Sample(3090015-BSI) Prepared&Analyzed 09/02/03 <br /> Benzene 105 050 ug/I 100 105 70-130 <br /> Toluene 104 050 100 104 70-130 <br /> Ethylbenzene 101 050 100 101 70-130 <br /> Xylenes(total) 298 050 300 99 70-130 <br /> Methyl Cert-butyl ether 105 20 100 105 70-130 <br /> Surrogate a,a a-Trifluorotoluene 947 100 95 60-140 <br /> Laboratory Control Samjile(3090015-BS2) Prepared&Analyzed 09/03/03 <br /> Benzene 945 050 ug/1 100 94 70-130 <br /> Toluene 965 050 100 96 70-130 <br /> Ethylbenzene 959 050 100 96 70-130 <br /> Xylenes(total) 290 050 300 97 70-130 . <br /> Methyl tent-butyl ether 9 17 20 100 92 70-130 <br /> Surrogate a a a-Triuorotoluene 890 100 89 60-140 <br /> Matnx Spike(3090015-MSI) Source S308609-19 Prepared&Analyzed 09/02/03 <br /> Benzene 9 25 050 ug/1 100 ND 92 60-140 <br /> Toluene—- 9 28�0 50�"�10 0�ND =93 60-140=- - <br /> Ethylbenzene 8 74 050 " 100 ND 87 60-140 <br /> --Xylenes total _� .-- - "--� _ <br /> (total)-- - ——26 4��----=0 50—- _ 30 0 - --ND�88— -60-140"- <br /> Methyl tent-butyl ether 958 2 0 100 ND 96 60-140 <br /> Surrogate a a,a-Trifluorotoluene 818 100 , 83 60-140 <br /> Matrix Spike Dup(3090015-MSDI) Source 5308609-19 Prepared&Analyzed 09/02/03 <br /> Benzene 101 0 50 ug/l 100 ND 101 60-140 9 25 <br /> Toluene 101 050 100 ND 101 60-140 8 25 <br /> Ethylbenzene 9 49 050 100 ND 95 60-140 8 25 <br /> Xylenes(total) 28 8 0 50 300 ND 96 60-140 9 25 <br /> Methyl ten-butyl ether 938 2 0 100 ND 94 60-140 2 25 <br /> Surrogate a a a-Triuorotoluene 850 100 85 60-140 <br /> Sequoia 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 /> Thu analytical report must be reproduced in its entirety <br /> Page 17 of 20 <br />