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885 Jarvis Dr <br /> 4DSequoia Mogan Hill,CA 95037 <br /> (408)776-9600 <br /> IW Analytical FAX(408)782-6308 <br /> www sequotalabs can <br /> URS Corporation[1] Project ARCO#6020,Manteca,CA MLL0107 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vem Elarth 12/31/02 08 34 <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 Lrnut Notes <br /> Batch 2L10015-EPA 5035 <br /> Blank(2L10015-BLKI) Prepared&Analyzed 12/10/02 <br /> Ethanol ND 40 ug/l <br /> tert-Butyl alcohol ND 20 <br /> Methyl tent-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 /> arrogate 12-Dichloroethane-d4 434 500 868 78-129 <br /> Laboratory Control Sample(2L10015-BSI) Prepared&Analyzed 12/10/02 <br /> Methyl tert-butyl ether 1 1 6 050 ugA 10 0 116 63-137 <br /> Betizene 104 050 100 104 78-124 <br /> Toluene 977 050 100 97 7 78-129 <br /> Surrogate 1 1-Dichloroethane-d4 4 49 500 898 78-129 <br /> Laboratory Control Sample(2LI0015-BS2) Prepared&Analyzed 12/10/02 <br /> Methyl tert-butyl ether 106 050 ug/l 840 126 63-137 <br /> Benzene 5 15 050 5 28 975 78-124 <br /> Toluene 295 050 31 8 928 78-129 <br /> Gasoline Range Orgames(C6-C10) 444 50 440 101 70-113 <br /> Surrogate 1 2-Dichloroethane-d4 420 500 840 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 /> Page 6 of 9 <br />