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1 <br /> Sequoia aMMC1kerAvcStc <br /> Sacramento CA 956344 <br /> A .. 1916)921-9600 <br /> Analytical <br /> FAX(916)921-0100 <br /> s www sequoialabs com <br /> eston Solutions Inc-Walnut Creek Project San Joaquin HSA 5306244 <br /> 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Jessica Levine 06/25/03 17 35 <br /> Gasoline(2-Methylpentane to 1,2,4-Trunethylbenzene) and BTEX by EPA 8015M and 8021B -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 3060257-EPA 5030B(P/T) <br /> Laboratory Control Sam le 3060257-BS4 Prepared&Analyzed 06/13/03 <br /> Ethylbenzene 101 050 119/1 100 101 70-130 <br /> Xylenes(total) 29 2 050 " 300 97 70-130 <br />' Methyl tent-butyl ether 944 2 0 100 <br /> 94 70-13D <br /> Surrogate a a a-Tryluorotoluene 9 05 100 90 60-140 <br />' Matnx Spike 3060257-MS1 Source S306321-01 Prepared&Anal 06/18/03 <br /> Benzene 104 050 uFA too ND 104 60-140 <br /> Toluene 9 69 050 100 ND 97 60-140 <br /> Ethylbenzene 102 050 " 100 ND 102 60-140 <br /> Xylenes(total) 31 1 050 300 ND 104 60-140 <br /> Methyl tert-butyl ether 125 2 0 100 ND 125 60-140 <br /> rrogate a,a a-Trifluorotoluene 11 2 100 112 60-140 <br />' Matrix Spike Dup(30.60257-MSDI) - Source 5306321-01 Prepared&Analyzed 06/18/03 <br /> Benzene 104 050 ug/1 10 0 ND 104 60-140 0 25 <br /> Toluene 988 050 too ND 99 60-140 2 25 <br />' Ethylbenzene 102 050 100 ND 102 60-140 0 25 <br /> Xylenes(total) 314 050 300 ND 105 60-140 1 25 <br /> Methyl tert-butyl ether 120 2 0 100 ND 120 60-140 4 25 <br /> Surrogate a,a a-Trifluorotoluene 11 0 " 100 110 60-140 <br /> 1 <br />' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet werght"='�` <br /> `- basis This analytical report must be reproduced in its entirety <br /> Page 10 of 11 <br />