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619 Seeker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)92 1-0 1 oo <br /> www sequoialabs com <br /> Gettler-Ryan-Dublin Project Former Unocal 2859,Stockton,CA S211346 <br /> 6747 Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Protect Manager Deanna L Harding 12/04/02 14 47 <br /> Total Purgeable Hydrocarbon, BTEX and MTBE by DHS LUFT - Quality Control <br /> L <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPI} <br /> Analyte Result Limit Units Level Result %REC limits RPD Limit Notes <br /> Batch 2110288-EPA 5030B(PIT) <br /> 'Blank(2110288-BLKI) - T- Prepared&"Analyzed 11/19/02 <br /> Purgeable Hydrocarbons ND 50 u8A <br /> Benzene ND 050 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-TriJluorotoluene 8 76 100 88 60-140 <br /> Blank(2110288-BLK3) _ - Prepared& Analyzed 11/21/02 - <br /> Purgeable Hydrocarbons ND 50 ugA <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 25 <br /> Surrogate a a a-TriJluorotoluene —935 " 10 0 94--60=140----- <br /> Laboratory Control Sample(2110288-BSI) Prepared& Analyzed 11/19/02 <br />- -Benzene _ ,r -- ------- --- ---- 966_.__050 -ugA-_ --100 _r-- --- —97-- =70-I30- = ---- — --- -- <br /> Toluene 9 80 0 50 Wo 98 70-130 <br /> Ethylbenzcne 957 0 50 100 96 70-130 <br /> Xylenes(total) 283 0 50 300 94 70-130 <br /> Methyi ten-butyl ether 11 1 2 5 100 111 70-130 <br /> Surrogate a a a-TriJluorotoluene 946 " 100 95 60-140 <br /> Laboratory Control Sample(2110288-BS2) _-- Prepared& Analyzed 11/20/02 <br /> Benzene 942 050 ug/I IOU 94 70-130 <br /> Toluene 980 050 IOU 98 70-130 <br /> Ethylbenzene 9 64 0 50 100 96 70-130 <br /> Xylenes(total) 28 3 0 50 300 94 70-130 <br /> Methyl tert-butyl ether 1 1 6 25 IOU 116 70-130 <br /> Sequoia Analytical - Sacramento The results in this repro t apply to the samples analyzed in accordance with the chain o <br /> custody document Unless otherwise stated i esults are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 22 <br />