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8 19 <br /> a— ) Sequoia .cramnto AveSte B <br /> Sacramento CA 95834 <br />' h (916)921-9600 <br /> iW Analytical FAX(916)92t-0100 <br /> ' www sequotalabs cum <br /> eslon 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-MethyIpentane 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 3060232-EPA 5030E <br /> Blank 3060232-BLKl Prepared&Analyzed 06/16/03 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 818 100 82 60-140 <br /> Blank 3060232-BLK2Prepared&Anal 06/17/03 <br /> Purgeable Hydrocarbons ND 50 u911 <br /> Benzene ND 0 50 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 n <br /> *ylenes(total) ND 0 50 <br /> Surrogate a a a-Trifluorotoluene 793 100 79 60-140 <br /> Blank(3060232-BLK3) Prepared&Analyzed 06/18/03 <br /> Purgeable Hydrocarbons ND 50 u911 <br /> Benzene ND 050 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorololuene 777 100 78 60-140 <br /> LaboratoryControl Sample(3060232-SSI) . _ Prepared&Analyzed 06/16/03 <br /> Benzene 9 89 050 ug/l 100 �. 99 70-130 <br /> Toluene 104 0 50 100 104 70-130 <br /> Ethylbenzene 103 0 50 100 103 70-130 <br /> Xylenes(total) 30 8 050 300 103 70-130 <br /> Surrogate a a a-Trruorotoluene 928 100 93 60-140 <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 slated results are reported on a wet weight-=-- <br /> basis <br /> eight-=--basis Thts analytical report must be reproduced in its entirety <br /> Page 6 of 1 l <br />