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404 N Wiget[ane <br /> a— —N <br /> Sequoia Walnut Geek,CA 94598 <br /> Analytical (925}988- <br /> FAX(916)488-96%7373 <br /> 9600 <br /> www sm iuoialabs can <br /> ICT Ryan,Inc -Dublin Project Unocal <br /> 7 Sierra Court Suite J Project Number Unocal#0187 Reported- <br /> in CA,94568 Project Manager Deanna L Harding 29-Apr-02 11 18 <br /> Total Purgeable Hydrocarbons (C6-02), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source °/aREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2D16002-EPA 50308 P/T <br /> Blank(2D16002-BLKI) Prepared&Analyzed 16-Apr-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 1.19/1 <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-Tnfluorotoluene 326 300 109 70-130 <br /> LCS(2 D I 6002-BSI) Prepared&Analyzed 16-Apr-02 <br /> Benzene 195 0 50 ug/l 200 98 70-130 <br /> Toluene 194 050 200 97 70-130 <br /> Ethylbenzene 192 050 200 96 70-130 <br /> XxIcnes(total) 609 0 50 600 102 70-130 <br /> Wale a a,a-Tnfluorotoluene 316 300 105 70-130 <br /> Matrix Spike(2D]6002-MSI) Source W204165-03RE1 Prepared&Analyzed 23-Apr-02 <br /> Benzene 197 050 ugA 200 ND 98 70-130 <br /> Toluene 191 050 It 200 ND 96 70-130 <br /> Ethylbenzene 192 050 200 ND 96 70-130 <br /> Xylenes(total) 598 0 50 600 ND 100 70-130 <br /> Surrogate a,a a-Tris luorotoluene 320 300 107 70-130 <br /> Matrix Spike Dup(2D]6002-MSDI) Source W204165-03RE1 Prepared&Analyzed 23-Apr-02 _ <br /> Benzene - 191 0 50 ug/l 200 ND 96 70-130 3 20 <br /> Toluene 182 0 50 200 ND 93 70-130 5 20 <br /> Ethylbenzene 182 0 50 200 ND 91 70-130 5 20 <br /> Xylenes(total) 573 050 600 ND 95 70-130 5 20 <br /> Surrogate a a,a-Triuorotoluene 317 300 106 70-130 <br /> la Analytical-Walnut Creek The results in this report apply 10 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 />