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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (747)792 1865 <br /> 1► Analytical FAX(707)7920342 <br /> www sequoralabs cam <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P412280 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/05/05 08 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source ONREC RPD <br /> Analyte Result Limit Units Level Result %REC limits RPD Limit Notes <br /> Batch 4120496-EPA 5030B waters/EPA 8260B <br /> Blank(4120496-BLK1) Prepared&Analyzed 12/24/04 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 ' <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 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> 100 84-122 <br /> �urrogate Dibromofluoromethane 5 02 SOD <br /> Surrogate 12-Drchloroethane-d4 547 Soo 109 74-135 <br /> Surrogate Toluene-d8 508 500 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 544 500 109 86-119 <br /> Laboratory Control Sample(4120496-BSI) Prepared&Analyzed 12/24/04 <br /> Tert-amyl methyl ether 530 1 0 ugA 500 106 78-117 <br /> Benzene 446 050 500 89 81-118 <br /> Tert-butyl alcohol 878 20 100 88 60-147 <br /> Di-isopropyl ether 5 19 10 500 104 70-125 <br /> 1,2 Dibromoethane(EDB) 500 050 500 100 85-125 <br /> 1,2-Drchloroethane 524 050 500 105 77-126 <br /> Ethanol 82 0 100 100 82 55-200 <br /> Ethylbenzene 449 050 500 90 89-122 <br /> Ethyl tert-butyl ether 527 10 500 105 71-120 <br /> Methyl tett-butyl ether 545 050 500 109 70-122 <br /> Toluene 449 0 50 500 90 84-119 <br /> Xylenes(total) 13 7 0 50 150 91 86-132 <br /> Surrogate Dibromofluoromethane 5 17 5 00 103 84-122 <br /> Surrogate 12-Drchloroerhane-d4 555 500 111 74-135 <br /> Surrogate Toluene-d8 5 01 5 00 100 84-119 <br /> Surrogate 4-Bronrofluorobenzene 521 500 104 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 rn its entirety <br /> Page 6 of 8 <br />