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Sequoia 1551 Carlos <br /> nal Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www segaoialabs com <br /> er-Ryan/Geostrategies(1) Project Tosco(1) <br /> Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/27/0109 39 <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 1120088- EPA 5030B(P/T) <br /> Blank(1120088-BLKI) Prepared&Analyzed 12/21/01 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/1 <br /> Benzene ND 0 50 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tett-butyl ether ND 5 0 " <br /> Surrogate a a a-Trifluorotoluene 104 100 104 70-130 <br /> LCS(1120088-BS1) Prepared&Analyzed 12/21/01 <br /> Benzene 112 050 ug/I 100 112 70-130 <br /> Toluene 101 0 50 100 101 70-130 <br /> Ethylbenzene 989 050 100 989 70-130 <br /> Xylenes(total) 293 050 300 97 7 70-130 <br /> 10ate a a a-Triluorotoluene 948 100 948 70-130 <br /> LCS(1120088-BS2) Prepared&Anaiyzed 12/21/01 <br /> Purgeable Hydrocarbons as Gasoline 250 50 ug/I 250 100 70-130 <br /> Surrogate a a a-Trifluorotoluene 963 " 100 965 70-130 <br /> Matrix Spike(1120088-MSI) Source L112095-01 Prepared&Analyzed 12/21/01 <br /> Purgeable Hydrocarbons as Gasoline 266 50 ug/I 250 ND 106 60-140 <br /> Surrogate a,a a-Triuorotoluene 103 100 103 70-130 <br /> A'Iatrix Spike Dup(1120088-1•7SDJ) Source L112095-02 Prepared&Analyzed 12/21/01 <br /> Purgeable Hydrocarbons as Gasoline 295 50 ug/I 250 ND Ila 60-140 10 3 25 <br /> Surrogate a a a-Triuorotoluene 9 61 11100 961 70-130 <br /> is Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 16 of 22 <br />