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a— ) <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> J FAX(707)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/04 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPB <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120702-EPA 5030E waters <br /> Laboratory Control Sample Du 3120702-BSDI Prepared&Analyzed 12/24/03 <br /> Tert-amyl methyl ether 102 10 ug/1 100 102 78-117 1 20 <br /> Benzene 1 06 050 1 00 106 81-118 7 20 <br /> Tert-butyl alcohol 21 6 20 200 108 60-147 15 20 <br /> Do-isopropyl ether 1 17 1 0 1 00 117 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 1 02 050 1 00 102 85-125 5 20 <br /> 1,2-Dtchloroethane 1 10 050 1 00 110 77-126 4 20 <br /> Ethanol 265 100 200 132 55-200 14 20 <br /> Ethylbenzene 1 04 0 50 1 00 104 89-122 10 20 <br /> Ethyl tert-butyl ether 1 02 10 1 00 102 71-120 1 20 <br /> Methyl tert-butyl ether 1 10 050 1 00 110 70-122 4 20 <br /> Toluene 0 995 050 1 00 100 84-119 7 20 <br /> Xylenes(total) 3 19 050 3 00 106 86 132 10 20 <br /> learrogate Dibromofluoromethane 654 600 109 84-122 <br /> arrogate 12-Dichloroethane-d4 619 600 103 74-135 <br /> Surrogate Toluene-d8 613 600 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 621 600 104 86-119 <br /> Batch 3120709-EPA 5030E waters <br /> Blank(3120709-BLKI) - Prepared&Analyzed 12/24/03 <br /> Tert-amyl methyl ether ND 1 0 119/1 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dtchloroethane ND 0 50 " <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 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 521 500 104 84-121 <br /> Surrogate 12-Dtchloroethane-d4 555 500 111 74-135 <br /> Surrogate Toluene-d8 501 500 100 84-119 <br /> Surrogate 4-Bromofluorobenzene 508 500 102 86 119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> • basis This analytical report must be reproduced in its entirety <br /> Page 33 of 35 <br />