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Sequoia 1455 McDowell Blvd,North Ste D <br /> I Petaluma,CA 94954 <br /> (707)721865A € ' ; <br /> L FAX(707 792!0342 <br /> 4, H y www.sequoialabs.com <br /> ' � I <br /> 4 t <br /> . 4 <br /> URS Corp-Sacramento II Project: Arco Site 6100,Tracy,CA <br /> 2870 Gateway Oaks Drive.Suite 300 " P309366 <br /> Project Number: WR36619 <br /> Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/06/03 18:00 f <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control � <br /> Sequoia Analytical -Petaluma <br /> Reportiog Spike Source %REC RPD <br /> Analyte: Result Limit Units Level Result %REC Limits RPD Limit Notes 1, <br /> ' I <br /> Batch 3100069-EPA 5030 waters <br /> Blank(3100069-BI KI) Prepared&Analyzed: 10/03/03 4 <br /> Tert-amyl methyl ether ND 1.0 ugil <br /> Benzene ND 0.50 Aj <br /> Teri-butyl alcohol ND " <br /> 20 <br /> Di-isopropyl ether NDI 1.0 <br /> 1,2-Dibmmoethane(£DB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND ,100 " <br /> Ethylbenzene ND i 0.50 , <br /> Ethyl tett-butyl ether ND <br /> a <br /> Methyl tert-butyl ether ND 0.50 1 <br /> Toluene ND 0.50 1 <br /> Xylenes i(total) ND 0.50 f <br /> =� Surrogate:DibromgJlunrnmethane 5.72 6.00 95 84-122 ? <br /> Surrogaie:1,2-Dichloroethone-d4 4.77 6.00 80 74-135 <br /> Surrogate: Toluene-dS 6.38 a 6.00 106 84-119 <br /> Surrngaie:4-Brmmoflanrnhenzene 5.74 6.00 96 86-119 <br /> Laboratory Sample(3100069-B51) Prepared&Analyzed: 10/03/03 <br /> Tert-amyl methyl ether 4.58 i 1.0 U94 5.00 92 70-116 <br /> Benzene 5.63 0.50 5.00 113 81-118 <br /> 'j. <br /> Tert-butyl alcohol 109 20 100 109 62-142 t { <br /> Di-isopropyl ether 5.25 1.0 5.00 105 71-121 p <br /> 1,2-Dibromoethane(EDB) 4.60 0.50 5.00 92 92-117 t <br /> 1,2-Dichloroethane 5.01 0.50 „ 5.00 100 79-126 <br /> Ethanol 77.6 100 100 78 65-135 <br /> Ethylbenzene 5.29 0.50 5.00 106 89-122 <br /> Ethyl teri-butyl ether 5.00 0 5.00 100 71-110 <br /> i <br /> Methyl tert-butyl ether 5.22 0.50 5.00 104 77-123 <br /> Toluene,; 5.61 9.50 5.00 112 84-119 <br /> Xylenes(total) 15.5 0.50 15.0 103 86-132 , <br /> Surrogate:DihromoJluoromethane 6.13 I: 6,00 102 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.31 II 6.00 88 74-135 <br /> Surrogate: Toluene-d8 6.J9 6.00 106 84-119 <br /> Surrogate:4-Bromo luorohenzene 5.886.00 98 86-119 <br /> i' <br /> } <br /> 4, t <br /> i - <br /> Sequoia Analytical-Petaluma The result's in this report apply to the samples analyzed in accordance with the chain <br /> of custndv document. Unless otherwise stated,results are reported on a wet weight i <br /> '3 hasis. This analvtical report must he reproduced in its entirety. <br /> i„ <br /> i. Page 7 of 9 <br /> I, <br />