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1455 McDowell Blvd,North Ste D <br /> a- ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www.segwialabs.com <br /> S Corp-Sacramento Project: Arco Site 5450,Stockton,CA P304543 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36604 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 05/09/03 15:37 <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 Notes <br /> Batch 3050175-EPA 5030 waters <br /> Blank(3050175-BLKI) Prepared:05/06/03 Analyzed:05/07/03 <br /> Teri-amyl methyl ether ND 1.0 ug/l <br /> Ten-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 4.84 4.50 108 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 4.81 4.50 107 74-135 <br /> Surrogate:Toluene-4`8 4.77 4.50 106 84-119 <br /> Laboratory Control Sample(3050175-BSI) Prepared:05/06/03 Analyzed:05/07/03 <br /> ethyl tert-butyl ether 5.15 0.50 ug/1 5.00 103 79-118 <br /> Surrogate:Dibromofluoromethane 5.07 4.50 113 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.69 4.50 104 74-135 <br /> Surrogate:Toluene-d8 4.94 4,50 110 84-119 <br /> Matrix Spike(3050175-MSI) Source:P304457-06 Prepared:05/06/03 Analyzed:05/07/03 <br /> Methyl tert-butyl ether 131 5.0 ug/l 50.0 95 72 79-118 Q-LIM <br /> Surrogate:Dibromofluoromethane 5.36 4.50 119 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.91 4.50 109 74-135 <br /> Surrogate:Toluene-d8 4.93 4.50 110 84-119 <br /> Matrix Spike Dup(3050175-MSDI) Source:P304457-06 Prepared:05/06/03 Analyzed:05/07/03 <br /> Methyl tert-butyl ether 149 5.0 ug/l 50.0 95 108 79-118 13 20 <br /> Surrogate:Dibromofluoromethane 4.85 4.50 108 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 4.85 4.50 108 74-135 <br /> Surrogate:Toluene-d8 4.88 4.50 108 84-119 <br /> 1 <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 8 of 9 <br />