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i <br /> 1551 Industrial Road <br /> Sequoia San Carlos CA94070 <br /> 232-96M <br /> 3 <br /> ; (650)232-96D0 <br /> Analy -96M <br /> tical FAX(650)232-9612 r <br /> www.sequoialabs.com <br /> Gettler-RyanlGeostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court.Suite J Project Number: Unocal SS408671,Stockton;CA Reported: <br /> Dublin CA.94568 Project Manager: Deanna Harding 09/05/01 07:36 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090001 - EPA 5030B(PCI') <br /> Blank(1090001-BLKI) Prepared&Analyzed:09/01/01 <br /> Purgeable Hydrocarbons as Gasoline ND 50 UO � <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 ` <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Methyl cert-butyl ether ND 5.0 " <br /> Surrogate:o,a,a-Trii luoroioluene 10.6 10.0 106 70-130 <br /> Blank(1090001-BLK2) Prepared&Analyzed:09/03/01 <br /> Purgeable Hydrocarbons as Gasoline ND 50 uCA <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Eibylbenzene Nis 0.50 ! `t <br /> Xylenes(total) ND 0.50 <br /> Methyl ten-butyl ether ND 5.0 " <br /> Surrogate:o,o,a-Triuorotoluene 9.54 10.0 95.4 70-130 <br /> LCS(1090001-BSI) Prepared&Analyzed:09/01/01 <br /> Benzene 9.15 0.50 ug/l 30.0 91.5 70-130 <br /> Toluene 9.22 0.50 10.0 92.2 70-130 <br /> Ethylbenzene 9.32 0.50 10.0 93.2 70-130 <br /> Xyienes(total) 27.9 0.50 30,0 93.0 70-130 <br /> Surrogate:a,a,a-Triuorotoluene 10.5 10.0 105 70-130 <br /> LCS(1090001-BS3) Prepared&Analyzed:09/01/01 <br /> Purgeable Hydrocarbons as Gasoline 272 50 ugll 250 109 70-130 <br /> Surrogate:a,a,a-Tris luorololuene 11.7 10.0 117 70-130 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of J <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 6 of 10 <br /> f <br /> _ _ 1 <br />