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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707) 965 <br /> FAX(707)792-0342 <br /> . www.sequoialabs.clabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469 Stockton CA <br /> J P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <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 %REG Limits RPD Limit Notes <br /> Batch 3090442-EPA 5030 waters <br /> Matrix Spike Dup(3090442-MSD1) Source:P309233-11 Prepared&Analyzed:09/19/03 <br /> Tert-amyl methyl ether 5.37 1.0 ug/I 5.00 ND 107 70-116 6 20 <br /> Benzene 5.35 0.50 5.00 ND 107 81-118 4 20 <br /> Tert-butyl alcohol 124 20 100 ND 124 62-142 10 20 <br /> Di-isopropyl ether 5.14 1.0 5.00 ND 103 71-121 5 20 <br /> 1,2-Dibromoethane(EDB) 5.40 0.50 5.00 ND 108 92-117 1 20 <br /> 1,2-Dichloroethane 5.17 0.50 5.00 ND 103 79-126 3 20 <br /> Ethanol 98.4 100 100 ND 98 65-135 11 20 <br /> Ethylbenzene 5.04 0.50 5.00 ND 101 89-122 0.4 20 <br /> Ethyl tert-butyl ether 5.09 1.0 5.00 ND 102 71-110 5 20 <br /> Methyl tert-butyl ether 4.89 0.50 5.00 0.31 92 77-123 5 20 <br /> Toluene 5.20 0.50 5.00 ND 104 84-119 2 20 <br /> Alftylenes(total) 15.7 0.50 15.0 ND 105 86-132 1 20 <br /> urrogate:Dibromofluoromethane 4.98 5.00 100 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.91 5.00 98 74-135 <br /> Surrogate:Toluene-d8 4.81 5.00 96 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.30 5.00 106 86-119 <br /> Batch 3090481 -EPA 5030 waters <br /> Blank(3090481-BLK1) Prepared&Analyzed:09/22/03 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tcn-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 5.74 6.00 96 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 5.24 6.00 87 74-135 <br /> Surrogate:Toluene-d8 6.05 6.00 10) 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.95 6.00 99 86-119 <br /> equoia 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 29 of 38 <br />