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1551 Industrial Road <br /> �. Sequoia San Carlos CA 94070 <br /> Analytical FAX(650)232-9600 <br /> (650)232-9612 <br /> www.sequoialabs.com <br /> �F <br /> ;.f. r-Ryan/GeostrategieS(1) Project: Tosco(1) <br /> Y747 Sierra Court, Suite I Project Number: Tosco#11195,Lathrop,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 12/10/01 19:11 <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 1]20008-EPA 5030B(P/T) <br /> Blank(1120008-BLKI) Prepared&Analyzed: 12/04/01 <br /> Purgeable Hydrocarbons as Gasoline 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 ten-butyl ether ND 5.0 " <br /> Surrogale:a,a,a-Triuorotoluene 10.3 10.0 103 70.130 <br /> LCS(1120008-BSI) Prepared&Analyzed: 12/04/01 <br /> Benzene 11.5 0.50 ug/I 10.0 115 70-130 <br /> Toluene 10.4 0.50 10.0 104 70-130 <br /> Ethylbenzene 10.1 0.50 10.0 101 70-130 <br /> Xv-cs(total) 30.0 0.50 30.0 Wo 70-130 <br /> Ste;s te:a,a,a-TriJTuorotoluene 9.95 10.0 99.5 70-130 <br /> LCS(1120008-BS2) Prepared&Analyzed: 12/04/01 <br /> Purgeable Hydrocarbons as Gasoline 227 50 ug/l 250 90.8 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 11.3 10.0 113 70-130 <br /> Matrix Spike(1120008-MSI) Source:LI11147-13 Prepared: 12/04/01 Analyzed: 12/05/01 <br /> Purgeable Hydrocarbons as Gasoline 237 50 ug/l 250 ND 94.8 60-140 <br /> Surrogate:a,a,o-Triuorotoluene 10.4 1, 10.0 104 70-130 <br /> Matrix Spike Dup(1120008-MSDI) Source:L111147-13 Prepared: 12/04/01 Analyzed: 12/05/01 <br /> Purgeable Hydrocarbons as Gasoline 229 50 ug/I 250 ND 91.6 60-140 3.43 25 <br /> Surrogate:a,o,a-Trruorotoluene 9.34 10.0 93.4 70-130 <br /> I <br /> i <br /> S alta Analytical - San Carlos The resulls in this report apply to the samples analyzed in accordance wiih the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> I <br /> I <br /> i <br /> Page 1 1 of 18 <br /> I <br />