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Sequoia 1455 Mcbowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Proiect:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Numher:G0BZK-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 04/13/05 09:46 <br /> : <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 Limit (Votes <br /> Batch 5040066-EPA 5030B waters/EPA 8260B <br /> Blank(5040066-BLKI) Prepared&Analyzed:04/07/05 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Ten-bury]alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Diehloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl ten-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) . ND 0.50 " <br /> Surrogate:Dibromofluoromelhane 4.75 5.00 95 84-121 <br /> .iurrogate:l,2-Drchloroelhane-d4 4.22 5.00 84 74-135 <br /> Surrogate:Toluene-d8 4.75 5.00 95 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.88 5.00 98 86-119 <br /> Laboratory Control Sample(5040066-BSI) Prepared&Analyzed:04/07/05 <br /> Ten-amyl methyl ether 4.55 1.0 ugll 5.00 91 78-117 <br /> Benzene 4.46 0.50 5.00 89 81-118 <br /> Tert-butyl alcohol 103 20 100 103 60-147 <br /> Di-isopropyl ether 4.56 1.0 5.00 91 70-125 <br /> 1,2-Dichloroethane 4.08 0.50 5.00 82 77-126 <br /> Ethanol 82.5 100 100 82 55-200 <br /> Ethylbenzene 4.80 0.50 5.00 96 89-122 <br /> Ethyl tert-butyl ether 4.33 1.0 5.00 87 71-120 <br /> Methyl tert-butyl ether 4.45 0.50 5.00 89 70-122 <br /> Toluene 4.85 0.50 5.00 97 84-119 <br /> Xylenes(total) 14.4 0.50 15.0 96 86-132 <br /> Surrogate:Dibromofluoromethane 4.89 5.00 98 84-121 <br /> Surrogate:1,2-Dichloroethane-d4 4.18 5.00 84 74-135 <br /> Surrogate:Toluene-d8 4.80 5.00 96 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.08 5.00 102 86-179 <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 /> i <br /> Page 25 of 29 <br />