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885 Jarvis Dr <br /> 4D Sequoia MQpn Hill,CA 95037 <br /> (408)776-9600 <br /> 1W Analytical FAX(408)7826308 <br /> www sequoialabs coin <br /> F <br /> us Environmental Inc Project ARCO#2130 MLL0779 <br /> Cameron Park Dr,Suite 550 Project Number ARCO#2130,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/10/03 16 20 <br /> gasoline(2-Methylpentane to 1,2,4-Trlmethylbenzene) 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 3010050-EPA 5030E(P/'T) <br /> Laboratory Control Sample(3010050-BS1) Prepared&Analyzed 12/31/02 <br /> Laboratory Control Sample(3010050-BS2) Prepared 01/01/03 Analyzed 01/02/03 <br /> Benzene 910 050 ug/l 100 91 70-130 <br /> Toluene 907 050 100 91 70-130 <br /> Ethylbenzene 924 050 " ' 100 92 70-130 <br /> Xylenes(total) 27 3 050 300 91 70-130 <br /> Surrogate a a a-Tris luoratoluene 958 100 96 60-140 <br /> Laboratory Control Sample Dup(3010050-BSD1) Prepared&Analyzed 12/31/02 <br /> Benzene 9 19 050 ug/l 100 92 70-130 2 25 <br /> Toluene 939 050 It 100 94 70-130 2 25 <br /> methylbenzene 954 050 « 100 95 70-130 1 25 <br /> Xylenes(total) 28 6 0 50 300 95 70-130 6 25 <br /> Surrogate a a a-Tris luorotoluene 100 100 100 60-140 <br /> ofequota <br /> 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 /> 13 of 17 <br />