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8 19 <br /> Sequoia acmmento CAe 583 <br /> Sacramento Cq 95834 <br />' Analytical (9!6)921-9600 <br /> FAX(916)92! 010 <br /> 4 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-Trimethylbenzene) 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(PIT) <br />' Blank 3060257-BLKI P ared&Anal ed 06/17/03 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br />' Toluene ND 050 n <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Surrogate a,a a-Tnfluorotoluene 116 100 116 60-140 <br /> IBlank 3060257-BLK2Prepared&Analyzed 06/18/03 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 " <br />' Toluene ND 050 n <br /> Qhylbenzene ND 0 50 " <br /> ylenes(total) ND 0 50 <br /> Methyl tert-butyl ether ND 2 0 " <br />' Surrogate a a a-Tnfluorotoluene 890 100 89 60-140 <br />' Blank 3060257-BLK3 Prepared&Analyzed 06/19/03 <br /> Purgeable Hydrocarbons ND 50 119/1 <br /> Benzene ND 050 " <br />' Toluene ND 0 50 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br />' Methyl tert-butyl ether ND 2 0 " <br /> Surrogate a a a-Tnfluorotoluene 8 38 10 0 84 60-140 <br />' Blank(3060257-BLK4) -- Prepared&Analyzed 06/13/03_ <br /> Purgeable Hydrocarbons ND 50 ugfl <br /> Benzene ND 0 50 " <br />' Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 0 50 " <br />' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document Unless otherwise stated,results are reported on a wet wetghk--4- <br /> basis 77iis analytical report must be reproduced in its entirety <br /> Page 8 of 1 l <br />