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885 Jams Dr <br /> a— ) Sequoia Margin Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs can <br /> Stratus Environmental Inc Project ARCO#2168 MLK0507 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 12/20/02 07 53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2K26008-EPA 5035 <br /> Blank(2K26008-BLKI) Prepared&Analyzed 11/26/02 <br /> Ethanol AFD 40 ug/l <br /> tert-Butyl alcohol ND 20 0-09 <br /> Methyl tert-butyl ether ND 050 " <br /> a-isopropyl ether ND 050 " <br /> Ethyl cert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> 0solme Range Organics(C6-C10) ND 50 <br /> Surrogate 12-Dichloroethane-d4 460 500 920 78-129 <br /> Laboratory Control Sample(2K2600&BSI) Prepared&Analyzed 11/26/02 <br /> Methyl tert-butyl ether 730 050 ug/1 100 730 63-137 <br /> Benzene 994 050 100 994 78-124 <br /> Toluene 127 050 100 127 78-129 <br /> Surrogate 1 2-Dichloroethane-d4 497 500 994 78-129 <br /> Laboratory Control Sample(2K26008-BS2) Prepared&Analyzed 11/26/02 <br /> Methyl tert-butyl ether 835 050 ugA 840 994 63-I37 <br /> Benzene 464 050 528 879 78-124 <br /> Toluene 345 050 318 108 78-129 <br /> Gasoline Range Organics(C6-C 10) 389 50 440 884 70-113 <br /> Surrogate 12-Dichloroethane-d4 491 500 982 78-129 <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 /> 9 of 12 <br />