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t 404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> Analytical (925)988-9600 <br /> FAX <br /> r (9l b)988-9673 <br /> www se uoialabs can <br /> ler Ryan,Inc -Dublin Project Unocal <br /> 47 Sierra Court Suite J Project Number Unocal#2859 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 29-Apr-02 11 22 <br /> Total Purgcable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2D16002-EPA 5030B P/T <br /> Blank(2D16002-BLKI) Prepared&Analyzed 16-Apr-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether(MTBE) ND 25 " <br /> Surrogate a a a-Triuorotoluene 32 6 300 109 70-130 <br /> LCS(21316002-BSI) Prepared&Analyzed 16-Apr-02 <br /> Benzene 195 050 ugA 200 98 70-130 <br /> Toluene 194 050 200 97 70-130 <br /> Etbylbenzene 192 050 200 96 70-130 <br /> ILYIenes(total) 609 050 600 102 70-130 <br /> gate a a a-Trtfluorotoluene 316 300 105 70-130 <br /> Matrix Spike(2D16002-MSI) Source W204165-03RE1 Prepared&Analyzed 23-Apr-02 <br /> Benzene 19 7 050 ug/l 200 ND 98 70-130 <br /> Toluene 19 1 050 200 ND 96 70-130 <br /> Ethylbenzene 19 2 050 200 ND 96 70-130 <br /> Xylenes(total) 598 050 600 ND 100 70-130 <br /> Surrogate a a a-Trtfluorotoluene 320 300 107 70-130 <br /> _Matrix Spike Dup(2D16002-MSDI) Source W204165-03RE1 Prepared&Analyzed 23-Apr-02 <br /> Benzene 191 050 ug/I 200 ND 96 70-130 3 20 <br /> Toluene 182 050 20 0 ND 91 70-130 5 20 <br /> Ethylbenzene 182 050 200 ND 91 70-130 5 20 <br /> Xylenes(total) 571 050 600 ND 95 70-130 5 20 <br /> Surrogate a a a-Trifluorotoluene 31 7 300 106 70-130 <br /> oia Analytical -Walnut Creek 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 /> 4 of 6 <br />