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l� <br /> Sequoia 404 N WiLane <br /> Walnut Creek CAA 9459988 <br /> (925)988-9500 <br /> Analytical FAX`925'988 9673 <br /> www sNuolalabs co <br /> Gettler Ryan,Inc - Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron 4 9-9840 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 07-Aug-01 15 35 <br /> Total Purgeable 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 1 G30003- EPA 5030B PIT <br /> LCS(IG30003-BS2) Prepared&Analyzed 31-Jul-01 <br /> BenzeneT 179 050 ug/1 200 895 70-130 <br /> Toluene 189 0 50 200 94 5 70-130 <br /> Ethylbenzene 19 9 0 50 200 995 70-130 <br /> Xylenes(total) 602 0 50 60 0 100 70-130 <br /> Surrogate a a a Triuorotoluene 300 300 100 70-130 <br /> LCS(1 G30003-BS3) Prepared&Analyzed 01-Aug-01 <br /> Benzene 188 0 50 ugli 200 940 70-130 <br /> 'toluene 197 050 200 985 70-130 <br /> Ethylbenzene 207 050 200 104 70-130 <br /> Xylenes(total) 626 050 600 104 70-130 <br /> Surrogate a a o-Triuorololuene 30 4 300 10070-130 <br /> Matrix Spike(IG30003-MSI) Source W107404-02 Prepared&Analyzed 30-Jul-01 <br /> Benzene 168 050 ugll 20 0 ND 84 0 70-130 <br /> Toluene 17 6 050 200 ND 880 70-130 <br /> Ethylbenzene 181 050 200 ND 905 70-130 <br /> Xylenes(total) 53 2 050 600 ND 887 70-130 <br /> —=Surrogate a a,a-Trifluorololuene 30 6 — — —30 0 --102-70-130— <br /> Matrix <br /> 02-70-130—Matrix Spike Dup(IG30003-M_S_D_1)_ _ __ ry_ Source W107404-0_2 Prepared&An_alyzed 30-1u1=01_ <br /> Benzene 171 056 ugA 200 ND 855 70-130 1 77 20 <br /> Toluene 179 050 200 ND 895 70-130 169 20 <br /> Ethylbenzene 182 050 200 ND 91 0 70-130 0 551 20 <br /> Xylenes(total) 54 0 050 " 600 ND 900 70-130 149 20 <br /> Surrogate a a a-Trifluorotoluene 304 300 101 70-130 <br /> Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyned in accordance with the chain <br /> custody document This analytical report must be reproduced in its enttqw <br /> Page 7 of 10 <br />