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.7 <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs coin <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 bevel Result %REC limits RPD Limit Notes <br /> Batch 4030563-EPA 5030B waters <br /> Blank(4030563-BLK1) Prepared&Analyzed 03/19/04 <br /> Tetrachloroethene ND 050 ugll <br /> Tnchloroethene ND 050 " <br /> Teri-amyl methyl ether ND 10 " <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 <br /> 1,2-1)3hromoetbatie(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> I <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 1 0 " <br /> ethyl tent-butyl ether ND 0 50 " <br /> luene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluoromethane 540 500 108 84-122 <br /> Surrogate 12 Dtchloroethane-d4 5 62 500 112 74-135 <br /> Surrogate Toluene-d8 510 500 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 527 500 105 86-119 <br /> Laboratory Control Sample(4030563-BS1) Prepared&Analyzed 03/19/04 <br /> Tert-amyl methyl ether 570 1 0 ugfl 500 114 78-117 <br /> Benzene 5 52 050 5 00 110 81-118 <br /> Tert-butyl alcohol 109 20 100 109 60-147 <br /> Di isopropyl ether 599 1 0 500 118 70-125 <br /> 1,2-Dibromoethane(EDB) 593 050 500 119 85-125 <br /> 1,2-Dichloroethane 574 050 500 115 77-126 <br /> Ethanol 101 100 100 101 55-200 <br /> Ethylbenzene 568 0 50 500 114 89-122 <br /> Ethyl tert-butyl ether 574 1 0 500 115 71-120 <br /> Methyl tert-butyl ether 564 050 500 113 70-122 <br /> Toluene 544 050 500 109 84-119 <br /> Xylenes(total) 17 2 050 Is 0 115 86-132 <br /> Surrogate Dibromofluoromethane 544 500 109 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 550 500 110 74-135 <br /> Surrogate Toluene-d8 513 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 516 500 105 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 we/weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 29 of 34 <br />