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S <br /> r1 <br /> 885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> i�D776-9600 <br /> Analytical (408; <br /> FAX <br /> www sequoialabs con <br /> Stratus Environmental Inc Project ARCO#2168 MMB0420 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 03/18/03 09 25 <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 31324040-EPA 5035 <br /> Blank(3B24040-BLK1) Prepared&Analyzed 02/24/03 <br /> Ethanol ND 40 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl ten-butyl ether ND 0 50 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Drchloroethane ND 0 50 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> 40 ylenes(total) ND 0 50 <br /> asolme Range Organics(C6-C10) ND 50 <br /> Surrogate 12-Dichloroethane-d4 4 91 5 00 982 78-129 <br /> Laboratory Control Sample(3B24040-BS1) Prepared&Analyzed 02/24/03 <br /> Methyl tert-butyl ether 9 87 050 ug/l 10 0 98 7 63-137 <br /> Benzene 9 87 0 50 100 98 7 78-124 <br /> Toluene 9 47 0 50 " 100 947 78-129 <br /> Surrogate 1 2-Dichloroethane-d4 536 500 107 78-129 <br /> Laboratory Control Sample 3B24040-BS2Prepared&Analyzed 02/24/03 <br /> Methyl tert-butyl ether 8 54 0 50 U94 9 04 945 63-137 <br /> Benzene 5 01 0 50 5 44 92 1 78-124 <br /> Toluene 28 4 050 32 8 866 78-129 <br /> Gasoline Range Organics(C6-C 10) 406 50 440 923 70-113 <br /> Surrogate 12-Drchloroethane-d4 504 5 00 101 78-129 <br /> .equoia Analytical-Morgan Hili The results in this report apply to the samples analyzed rn accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> 7 of 9 <br />