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819 Sttiker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> * (916)921-9600 <br /> Analytical ww.equoi921-0100 <br /> www.sequoisla6s.com <br /> Gettler-Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 <br /> 6747 Sierra Court,Ste.! Project Number: N/A 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 RPDLimit Notes <br /> Batch 3060148-EPA 5030B(P/7) <br /> Blank(3060148-BLKI) Prepared& Analyzed:06/10/03 <br /> Ethylbenzene ND 0.50 ug/l <br /> Xylenes-(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Surrogate:a,a,a-Triuorotoluene 9.14 " 10.0 91 60-140 <br /> Blank(3060148-BLK2) Prepared& Analyzed:06/11/03 <br /> Purgeable Hydrocarbons _ - ND 50 ug/1 <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-Trifluorotoluene 8.78 10.0 88 60-140 <br /> Laboratory Control Sample(3060148-BSI) Prepared& Analyzed:06/10/03 <br /> Benzene 9.33 0.50 ug/l 10.0 93 70-130 <br /> Toluene 9.49 0.50 10.0 95 70-130 <br /> Ethylbenzene 9.62 0.50 10.0 96 70-130 <br /> Xylenes(total) 27.3 0.50 30.0 91 70-130 <br /> Methyl tert-butyl ether 8.84 2.0 10.0 88 70-130 <br /> Surrogate:a,a,a-Tris luorotoluene 8.85 10.0 88 60-140 <br /> LaboratorX Control Sample(3060148-BS2) Prepared&Analyzed:06/11/03 <br /> Benzene 10.4 0.50 ug/l 10.0 104 70-130 <br /> Toluene 10.5 0.50 10.0 ]05 70-130 <br /> Ethylbenzene 10.4 0.50 10.0 104 70-130 <br /> Xylenes(total) 29.9 0.50 30.0 100 70-130 <br /> Methyl tett-butyl ether 11.1 2.0 10.0 H] 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 9.79 " 10.0 98 60-140 <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document. Unless otherwise slated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 27 of 32 <br />