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819 Striker Ave Ste 9 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical 6)921-0100 <br /> www-seqw.sequaialabs.com <br /> Gettler-Ryan-Rancho Cordova Project: Former Unocal 0187,Stockton,CA S309456 <br /> 3140 Gold Camp Dr.,Ste. 170 Project Number: NIA Reported: <br /> Rancho Cordova CA,95670 Project Manager: Geoffrey D.Risse 09/08/03 15.29 <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 %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080298-EPA 5030B(P/T) <br /> Laboratory Control Sample(3080298-BSI) Prepared&Analyzed:08/21/03 <br /> Benzene 9.42 0.50 119/1 10.0 94 70-130 <br /> Toluene 9.43 0.50 10.0 94 70-130 <br /> Ethylbenzene 9.23 0.50 10,0 92 70-130 <br /> Xylenes(total) 27.4 0.50 30.0 91 70-130 <br /> Methyl tort-butyl ether 10.6 2.0 TP10.0 106 70-130 <br /> Surrogate:a,a,a-Triuorotoluene 8.48 10.0 85 60-140 <br /> Laboratory Control Sample(3080298-BS2) Prepared&Analyzed: 08/22/03 <br /> Benzene 9.07 0.50 ug/1 10.0 91 70-130 <br /> Toluene 8.94 0.50 10.0 89 70-130 <br /> Ethylbm=e 8.95 0.50 10.0 90 70-130 <br /> Xylenes(total) 26.7 0.50 30.0 89 70-130 <br /> AdMW&thvi tert-butyl ether 10.0 2.0 10.0 100 70-130 <br /> rrogate:a,a,a-Triuorotoluene 8.55 10.0 86 60-140 <br /> Laboratory Control Sample(3080298-BS3) Prepared&Analyzed: 08/25/03 <br /> Benzene 9.75 0.50 ug/l 10.0 98 70-130 <br /> Toluene 9.97 0.50 10.0 100 70-130 <br /> Ethylbenzene 9.78 0.50 10.0 98 70-130 <br /> Xylenes(total) 29.9 0.50 30.0 100 70-130 <br /> Methyl tert-butyl ether 10.2 2.0 10.0 102 70-130 <br /> Surrogate aa,a-Triuorotoluene 8.98 10.0 90 60-140 <br /> Laboratory Control Sample(3080298-BS4) Prepared&Analyzed:08/26/03 <br /> Benzene 9.69 0.50 ug/I 10.0 97 70-130 <br /> Toluene 9.71 0.50 10.0 97 70-130 <br /> Ethylbenzene 9.48 0.50 10.0 95 70-130 <br /> Xylenes(total) 29.6 0.50 30,0 99 70-130 <br /> Methyl tert-butyl ether 10.1 2.0 01 10.0 101 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 8.74 1110.0 87 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 /> This analytical report must be reproduced in its entirety. <br /> Page 7 of 9 <br /> a <br /> I <br />