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819 Striker Ave Ste 8 <br /> ,X� Sequoia Sacramento,CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(416)921-0100 <br /> www.sequoialabs.com <br /> Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 <br /> 6747 Sierra Court,Ste.J Project Number: NIA Reported: <br /> Dublin CA,94568 Project Manager: Deanna L. Harding 06/16/03 15:43 <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 3060103-EPA 5030BTM <br /> Blank(3060103-BLK2) Prepared&Analyzed:06/09/03 <br /> Purgeable Hydrocarbons ND 50 ug(l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Surrogate:a,a,a-TrifTuorotoluene 9.10 10.0 91 60-140 <br /> Blank(3060103-BLK3) Prepared&Analyzed:06/10/03 <br /> Purgeable Hydrocarbons ND 50 ugA - <br /> Benzene ND 0.50 " <br /> Toluene ND 6.50 <br /> Ethylbenzene ND 0.50 i <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Surrogate:a,a,o-TrPuorotoluene 9.14 10.0 91 60-140 <br /> Laboratory Control Sample(3060103-BS1) Prepared&Analyzed:06/06/03 <br /> Benzene 9.39 0.50 ugA 10.0 94 70-130 <br /> Toluene 9.56 0.50 10.0 96 70-130 <br /> Ethylbenzene 10,0 0.50 10.0 100 70-130 <br /> Xylenes(total) 28.4 0.50 30.0 95 70-130 <br /> Methyl tert-butyl ether 10.2 2.0 10.0 102 70-130 <br /> Surrogate:a,a.a-Trifluorotoluene 9.72 10.0 97 60-140 <br /> Laboratory Control Sample(3060103-BS2) Prepared&Analyzed:06/09/03 <br /> Benzene 10.8 0.50 ugA 10.0 108 70-130 <br /> Toluene 10.8 0.50 10.0 108 70-130 <br /> Ethylbenzene 10.7 0.50 10.0 107 70-130 <br /> Xylenes(total) 30.7 0.50 30.0 102 70-130 <br /> Methyl ter!-butyl ether 11.5 2.0 10.0 1.15 . 70-130. <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain <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 25 of 32 <br />