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819 Sinker Ave Ste 8 <br /> a_ _� Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> i Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> Gettler-Ryan-Dublin Project Former Unocal 2859,Stockton,CA S211346 <br /> 6747 Sierra Court,Stt 3 Project Number N/A Reported <br /> Dublin CA,94568 1 Project Manager Deanna L Harding 12/04/02 14 47 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia AnalyticaI - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2110391 -EPA 5030B (PIT) <br /> Blank(2110391-BLKI) Prepared& Analyzed 11/22/02 <br /> Purgeable Hydrocarbons ND 50 u0 <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 25 " <br /> Surrogate a a a-Trifluorotoluene 853 100 85 60-140 <br /> Laboratory Control Sample(2110391-BSI) _ - Prepared&Analyzed 11/22/02 <br /> Benzene 101 0 50 ug/I 100 101 70-130 <br /> Toluene 104 050 100 104 70-130 <br /> Ethylbenzene 102 0 50 100 102 70-130 <br /> Xylenes(total) 304 0 50 300 101 70-130 <br /> Methyl Cert-butyl ether 1 1 6 25 100 116 70-130 <br /> Surrogate a a a-Trtlluorotoluene 11 0 100 110 60-140 <br /> a <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain o <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 22 <br />