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~ 1551 industrial Road <br /> 4DSequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www segaoislabs cam <br /> er-Ryan/Geostrategies(l) Project Unocal(4) <br /> Sierra Court,Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/04/02 08 47 <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 2020070-EPA 5030B(PIT) <br /> Blank(2020070-BLK1) Prepared&Analyzed 02/21/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/I <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND so " <br /> Surrogate a a a-Tris luorotoluene 951 100 951 70-130 <br /> LCS(2020070-BSI) Prepared&Analyzed 02/21/02 <br /> Benzene 105 0 50 ugll 100 105 70-130 <br /> Toluene 105 050 100 105 70-130 <br /> Ethylbenzene 107 050 100 107 70-130 <br /> Xylenes(total) 321 050 300 107 70-130 <br /> S*to a a a-Trifluorotoluene 896 100 896 70-130 <br /> LCS(2020070-BS2) Prepared&Analyzed 02/21/02 <br /> Purgeable Hydrocarbons as Gasoline 276 50 ug/t 250 110 70-130 <br /> Surrogate a a a-Tr fluorotoluene 971 100 971 70-130 <br /> Matrix Spike(1020070-MSI) Source L202097-21 Prepared&Analyzed 02/21/02 <br /> Benzene 925 050 ug/l 100 ND 925 60-140 <br /> Toluene 106 050 100 16 900 60-140 <br /> Ethylbenzene 965 050 Wo ND 965 60-140 <br /> Xylenes(total) 300 050 h300 1 9 937 60-140 <br /> Surrogate ax a-2)iuorotoluene 955 " 100 955 70-130 <br /> Matrix Spike Dup(2020070-MSD]) Source L202097-21 Prepared&Analyzed 02/21/02 - <br /> Benzene 11 1 050 USA too ND 1]] 60-140 18 2 25 <br /> Toluene 125 0 50 100 16 109 60-140 165 25 <br /> Ethylbenzene I 1 6 050 100 ND 116 60-140 184 25 <br /> Xylenes(total) 35 6 050 300 19 112 60-140 17 1 25 <br /> Surrogate am,a-Trifluorotoluene 984 100 98 4 70-130 <br /> S Analytical -San Carlos The results to 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 14 of 18 <br />