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Sequoia t55tarlosC al Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX ectum labs c 12 <br /> www sequoialabs cam <br /> er-Ryan/Geostrategies(I Project Tosco(1) <br /> Sierra Court,Suite J Projecl Number Tosco(Unocal)SS46981, 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 1120079-EPA 5030B(PIT) <br /> Blank (1120079-BLKI) Prepared&Analyzed 12/20/01 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Surrogate a,a a-Trifluorotoluene 103 100 103 70-130 <br /> LCS(1120079-BSI) Prepared&Analyzed 12/20/01 <br /> Benzene 945 050 ug/l 100 945 70-130 <br /> Toluene 938 050 100 938 70-130 <br /> Ethylbenzene 935 050 100 93 5 70-130 <br /> Xylenes(total) 283 050 300 943 70-130 <br /> to a a a-Trifluorololuene 103 " 100 103 70-130 <br /> LCS(1120079-BS2) Prepared&Analyzed 12/20/01 <br /> Purgeable Hydrocarbons as Gasoline 283 50 ug/I 250 113 70-130 <br /> Surrogate a,a a-Triuorotoluene 999 100 999 70-130 <br /> Matrix Spike(1120079-MS1) Source L112085-02 Prepared&Analyzed 12/20/01- <br /> Purgeable Hydrocarbons as Gasoline 264 50 ug/I 250 ND 106 60-140 <br /> Surrogate a a a-Triuorotoluene 104 100 104 70-130 <br /> Matrix Spike Dup(1120079-MSDI) Source LI 12085-02 Prepared&Analyzed 12/20/01 <br /> Purgeable Hydrocarbons as Gasoline 281 50 ug/l 250 ND 112 60-140 624 25 <br /> Surrogate aaa-Triuorwoluene I1 1 11100 111 70-130 <br /> to 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 to its entirety <br /> Page 14 of 22 <br />