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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 cam <br /> RS Corporation[lj Project ARCO#6020,Manteca,CA MMB0590 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 03/05/03 09 36 <br /> Volatile Organic Compounds by EPA Method 82608- 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 3B27005-EPA 5030B PIT <br /> Blank(3B27005-BLKI) Prepared&Analyzed 02/27/03 <br /> Ethanol ND 40 119/1 <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-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 /> Gasoline Range Organics(C6-C10) ND 50 " <br /> Surrogate 1 2-Dichloroethane-d4 526 500 105 78-129 <br /> Laboratory Control Sample(3B27005-BSI) Prepared&Analyzed 02/27/03 <br /> Methyl tert-butyl ether 987 050 ugn 100 987 63-137 <br /> Benzene 9 68 050 100 968 78-124 <br /> Toluene 10 2 050 100 102 78-129 <br /> Surrogate 1 2-Dichloroethane-d4 4 64 500 928 78-129 <br /> Laboratory Control Sample(3B27005-BS2) Prepared&Analyzed 02/27/03 <br /> Methyl tert butyl ether 843 050 ug/l. 904 93 3 63-137 <br /> Benzene 555 050 544 102 78-124 <br /> Toluene 33 8 0 50 328 103 78-129 <br /> Gasoline Range Organics(C6-C10) 444 50 440 101 70-113 <br /> Surrogate 12-Dichloroethane-d4 476 500 952 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 bases <br /> This analytical report must be reproduced in its entirety <br /> 6 of 8 <br />