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} 1455 McDowell Blvd,North Ste D <br /> 6D Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs 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 Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunit Nates <br /> Batch 4030532-EPA 5030B waters <br /> Blank(4030532-BLK1) Prepared&Analyzed 03/19/04 <br /> Tetrachloroethene ND 050 ug/1 <br /> Trichloroethene ND 050 " <br /> Tert-amyl methyl ether ND 10 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> D,-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-D3chloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> oMethyl tert-butyl ether ND 050 <br /> luene ND 050 " <br /> ylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 554 500 111 84-122 <br /> Surrogate 12-Dichloroethane-d4 595 500 119 74-135 <br /> Surrogate 7oluene-d8 517 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 526 o500 105 86-119 <br /> Laboratory Control Sample(4030532-BSI) Prepared&Analyzed 03/19/04 <br /> Tert-amyl methyl ether 543 10 u8/1 500 109 78-117 <br /> Benzene 525 050 5 00 105 81-118 <br /> Tett-butyl alcohol 985 20 100 98 60-147 <br /> Di-isopropyl ether 549 10 5 00 110 70-125 <br /> 1,2-Dibromoethane(EDB) 556 050 5 00 111 85-125 <br /> 1,2-Dichloroethane 566 050 5 00 113 77-126 <br /> Ethanol 93 1 ]00 100 93 55-200 <br /> Ethylbenzene 523 050 500 105 89-122 <br /> Ethyl tert-bury!ether 545 10 5 00 109 71-120 <br /> Methyl tett butyl ether 535 050 500 107 70-122 <br /> Toluene 519 050 500 104 84-119 <br /> Xylenes(total) 162 050 15 0 108 86-132 <br /> Surrogate Dibromofluoromethane 519 500 104 84-122 <br /> Surrogate 12-Dtchloroethane-d4 535 500 107 74-135 <br /> Surrogate Toluene-d8 496 " 500 99 84-119 <br /> Surrogate 4-BromoJluorobenzene 493 500 99 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the charm 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 27 of 34 <br />