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819 Sinker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-96M <br /> FAX(916)921-0100 <br /> a- ) <br /> Analytical wwwsequokalabscom <br /> Ryan-Dublin Project Former Unocal 2859,Stockton,CA S303055 <br /> 67 Sierra Court,Ste J Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 03/19/03 18 34 <br /> Gasoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B- Quality Contr <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3030107-EPA 5030B (PIT) <br /> Blank(3030107-BLK4) Prepared&Analyzed 03/11/03 <br /> Methyl Leri-butyl ether ND 20 ugA <br /> Surrogate a a a-Trifluorotoluene 854 100 85 60-140 <br /> Blank(3030107-BLK6) Prepared&Analyzed 03/13/03 <br /> Purgeable Hydrocarbons ND 50 ugll <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl test-butyl ether ND 2 0 " <br /> 5 re a a a-Trifluorotoluene 7 95 100 so 60-140 <br /> Laboratory Control Sample(3030107-BSI) Prepared& Analyzed 03/06/03 <br /> Benzene 979 050 ug/l 100 98 70-130 <br /> Toluene 976 050 100 98 70-130 <br /> Ethylbenzene 976 050 100 98 70-130 <br /> Xylenes(total) 295 050 30 0 98 70-130 <br /> Methyl Cert-bury]ether 107 2 0 100 107 70-130 <br /> Surrogate a a a-Trifluorotoluene 986 100 99 60-140 <br /> Laboratory Control Sample(3030107-BS2) Prepared&Analyzed 03/07/03 <br /> Benzene 9 84 0 50 ugll 100 98 70-130 <br /> Toluene 977 050 100 98 70-130 <br /> Ethylbenzene 9 81 0 50 100 98 70-130 <br /> Xylenes(total) 297 050 300 99 70-130 <br /> Methyl Leri-butyl ether 103 2 0 100 103 70-130 <br /> Surrogate a a,o-Trifluorotoluene 101 100 101 60-140 <br /> ola Analytical - Sacramento The i esults in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless othermuse stated results at a reported on a wet weight basis <br /> This analytical report must be reproduced in its entirery <br /> Page 16 of 24 <br />