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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776 9600 <br /> FAX 308 <br /> Analytical wwseq 8) labs782 con <br /> www scquo�alabs corn <br /> URS Corporation[Arcot) Project ARCO#6020,Manteca,CA MNH0330 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number NIP Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/04 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source "/6REC RPD <br /> Analyte Result Limit Units Level Result °/uREC Limits RPD Limit Notes <br /> Batch 4H18002-EPA 5030B PIT <br /> Blank(4HI8002-BLK1) Prepared&Analyzed 08/18/04 <br /> tent-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1 2-Dichloroethane ND 050 " <br /> Ethanol ND 100 IC <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzenc ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> ohne Range Organics(C4-C12) ND 50 " <br /> arrogate 1 2-Dichloroethane-d4 457 5 00 91 78-129 <br /> Laboratory Control Sample(4HI8002-BSI) Prepared&Analyzed 08/18/04 <br /> tert-Amyl methyl ether 108 050 ug/I 100 108 82-140 <br /> Benzene 10 6 050 100 106 69-124 <br /> tert-Butyl alcohol 536 20 500 107 56-131 <br /> Di-isopropyl ether 10 3 050 100 103 76-130 <br /> 1,2-Dibromoethane(EDB) 10 6 050 100 106 77-132 <br /> 1 2-Dichloroethane 958 050 100 96 77-136 <br /> Ethanol 138 100 200 69 31-143 IC <br /> Ethyl tert-butyl ether 105 050 100 105 81-121 <br /> Ethylbenzene 110 050 100 110 84-132 <br /> Methyl tert-butyl ether 101 050 100 101 63-137 <br /> Toluene 1 1 0 050 100 110 78-129 <br /> Xylenes(total) 31 2 050 300 104 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 454 500 91 78-129 <br /> Sequoia Analytical-Morgan HIII 77ie 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 /> 77ns analytical report must be reproduced in its entirety <br /> Page 11 of 18 <br />