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1� <br /> 1 <br /> 1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> . www sequatalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Sptke Source %REC RPD <br /> Analyte Result Lunt Umts Level Result %REC Limits RPD Lanit Notes <br /> Batch 4030564-EPA 5030B waters <br /> Laboratory Control Sample Dup(4030564-BSDI) Prepared&Analyzed 03/19/04 <br /> Surrogate 4-Bromofluorobenzene 408 450 91 86-119 <br /> Batch 4030573-EPA 5030B waters <br /> Blank(4030573-BLKI) Prepared&Analyzed 03/20/04 <br /> Tetrachloroethene ND 050 ug/1 <br /> Tnchloroethene ND 050 " <br /> Teri-amyl methyl ether ND to " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2 Dibromoethanc(EDB) ND 0 50 " <br /> 2 Dichloroethane ND 050 " <br /> }ianol 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 /> Surrogate Dibromofluoromothane 566 500 113 84 122 <br /> Surrogate 1 2-Dichloroethane-d4 639 500 118 74-135 <br /> Surrogate Toluene d8 494 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 527 500 105 86-119 <br /> Laboratory Control Sample(4030573-BS1) Prepared&Analyzed 03/20/04 <br /> Teri-amyl methyl ether 540 10 ug/l 500 108 78-117 <br /> Benzene 552 050 500 110 81 118 <br /> Tert-butyl alcohol 106 20 100 106 60 147 <br /> Di isopropyl ether 590 10 500 118 70 125 <br /> 1,2 Dibromoethane(EDB) 557 0 50 500 111 85-125 <br /> 1,2 Dichloroethane 572 050 500 114 77-126 <br /> Ethanol 105 100 100 105 55-200 <br /> Ethylbenzene 547 050 500 109 89-122 <br /> Ethyl tert butyl ether 578 10 500 116 71-120 <br /> Methyl Cert-butyl ether 562 050 500 112 70-122 <br /> Toluene 557 050 500 111 84-119 <br /> Xylenes(total) 167 050 15 0 111 86-132 <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 32 of 34 <br />