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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> a— ) <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.ccm <br /> URS Corporation[l] Project: ARCO#2093,Tracy,CA MLL0775 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO 92093,Tracy,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Rlarth 01/10/03 12:48 <br /> gasoline(2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B- Quality Contra <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3010078-EPA 5030B <br /> Duplicate(3010078-DUP1) Source:S212803-02 Prepared&Analyzed:01/06/03 <br /> Purgeable Hydrocarbons ND 50 ug/1 ND 200 <br /> Benzene ND 0.50 ND 200 <br /> Toluene ND 0.50 ND 200 <br /> Ethylbenzene ND 0.50 ND 200 <br /> Xylenes(total) ND 0.50 ND 200 <br /> Surrogate:a,a,a-Trifluorotoluene 9.89 10.0 99 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> . custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> 6of8 <br />