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Sequoia 819 Avenue Suite 8 <br /> Sacramento CA 95834 <br /> 4 15) (916)921-9600 <br /> *IWO Analytical FAX equ alabs92 1 c 00 <br /> www sequoialabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton,CA <br /> 6747 Sierra Court,Ste J Project Number C-Sparge Test Rgwrted <br /> Dublin CA,94568 Project Manager Paul LeChemmant 07/20/01 1 120 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1070171 -EPA 5030B P <br /> Blank(1070171-BLKI) Prepared 07/16/01 Analyzed 07/20/01 <br /> Purgeable Hydrocarbons ND 50 ug/t <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl ter[-butyl ether ND 2 5 " <br /> Surrogate a a a-Trifluorotoluene 106 100 106 60-140 <br /> LCS(1070171-BS1) Prepared 07/16/01 Analyzed 07/20/01 <br /> Benzene 10 6 050 ug/I 100 106 70-130 <br /> Wric 101 0 50 ii too 101 70-130 <br /> /benzene 911 0 50 100 91 1 70-130 <br /> Xylenes(total) 287 0 50 300 957 70-130 <br /> Methyl tert-butyl ether 112 25 100 112 70430 <br /> Surrogate a a a-Triuorotoluene 109 100 109 60-140 <br /> OquOia Analytical- Sacramento 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 /> page 4 of 5 <br />