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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia FAX Petaluma,CA 94954 <br /> Analytical (7 )792-1865 <br /> (70'i7 792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/02/04 10 16 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit ]Votes <br /> Batch 4020577-EPA 5030B waters <br /> Blank(4020577-BLK1) Prepared&Analyzed 02/26/04 <br /> Tert-amyl methyl ether ND 10 ugll <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-Isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2 Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tart butyl ether ND 050 " <br /> Toluene ND 050 " <br /> AdakXylenes(total) ND 050 " <br /> 'Wurrogate Dibromofluoromethane 582 " 600 97 84-122 <br /> Surrogate 12-Drchloroethane-d4 585 600 98 74-135 <br /> Surrogate Toluene-d8 581 600 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 629 600 105 86-119 <br /> Laboratory Control Sample(4020577-BSI) Prepared&Analyzed 02/26/04 <br /> Tert-amyl methyl ether 453 10 ug/l 500 91 78-117 <br /> Benzene 4 76 050 5 00 95 81-118 <br /> Tert-butyl alcohol 106 20 100 106 60-147 <br /> Di-isopropyl ether 451 1 0 5 00 90 70-125 <br /> 1,2-Dibromoethane(EDB) 4 83 050 500 97 85-125 <br /> 1,2-Dichloroethane 474 050 5 00 95 77-126 <br /> Ethanol 892 100 100 89 55-200 <br /> Ethylbenzene 4 93 050 5 00 99 89-122 <br /> Ethyl tert-butyl ether 434 10 500 87 71-120 <br /> Methyl tert-butyl ether 459 050 5 00 92 70-122 <br /> Toluene 440 050 500 88 84-119 <br /> Xylenes(total) 152 050 150 101 86-132 <br /> Surrogate Dibromofluoromethane 587 600 98 84-122 <br /> Surrogate 12-Dichloroethane-d4 584 6 00 97 74-135 <br /> Surrogate Toluene-d8 5 70 6 00 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 636 6 00 106 86-119 <br /> Sequoia Analytical-Petaluma 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 /> Page 16 of 18 <br />