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i <br /> Sequoia 1455Mcl7owe11Blvd,North Ste <br /> ^ � Petaluma,CA 949544 <br /> (707)792-1865 <br /> ��► Analytical FAX(707)792-0342 <br /> I • www.sequaialabs.com <br /> I <br /> URS Corp-Sacramento Project:Arco Site 5450,Stockton,CA P409110 <br /> 2870 Gateway Oaks Drive Suite 300 <br /> Sacramento <br /> Number:WR36604 Reported: <br /> Sacramento CA,95833 Project Manager:Jeff Brooks 09/16/04 15:54 <br /> Volatile Organic Compounds by EPA Method 8260E-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %nREC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4090279-EPA 5030B waters <br /> T) y�Matrix Spike(4090279-MSI) Source:P409033-07RE1 Prepared&Analyzed:09/14/04 <br /> �\1&.1i1 Tert-amyl methyl ether 25.9 5.0 ug/1 25.0 ND 104 78.117 <br /> CJ Benzene 27.9 2.5 25.0 ND 112 81-118 <br /> Tert-butyl alcohol 520 100 500 ND 104 60.147 <br /> Di-isopropyl ether 26.2 5.0 25.0 ND 105 70-125 <br /> 1,2-Dibromoelhane(EDB) 27.8 2.5 " 25.0 ND 111 85-125 <br /> 1,2-Dichloroethane 27.8 2.5 25.0 ND 111 77-126 <br /> Ethanol 750 500 500 ND 150 55-200 <br /> Ethylbenzene 29.3 2.5 25.0 ND 117 89-122 <br /> Ethyl tert-butyl ether 26.1 5.0 25.0 ND 104 71-120 <br /> Methyl tert-butyl ether 80.9 2.5 25.0 48 132 70-122 LM <br /> Toluene 28.3 2.5 25.0 1.3 108 84-119 <br /> Xylenes(total) 86.6 2.5 75.0 3.7 111 86-132 <br /> Surrogate:Dibromofluoromeihane 5.32 5.00 106 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 5.38 5.00 108 74.135 <br /> Surrogate:Toluene-d8 5.41 5.00 108 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.40 5.00 108 86-119 <br /> Matrix Spike Dup(4090279-MSD1) Source:P409033-01 RE I Prepared&Analyzed:09/14/04 <br /> Tert-amyl methyl ether 24.6 5.0 ugll 25.0 ND 98 78-117 5 20 <br /> Benzene 26.6 2.5 25.0 ND 106 81-118 5 20 <br /> Tert-bury!alcohol 560 100 500 ND 112 60-147 7 20 <br /> Di-isopropyl ether 25.5 5.0 " 25.0 ND 102 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 26.7 2.5 25.0 ND 107 85-125 4 20 <br /> 1,2-Dichloroethane 26.0 2.5 25.0 ND 104 77-126 7 20 <br /> Ethanol 638 500 " 500 ND 128 55-200 16 20 <br /> Ethylbenzene 28.3 2.5 25.0 ND 113 89-122 3 20 <br /> Ethyl tert-butyl ether 25.5 5.0 25.0 ND 102 71-120 2 20 <br /> Methyl tert butyl ether 71.9 2.5 25.0 48 96 70-122 12 20 <br /> Toluene 27.1 2.5 25.0 1.3 103 84-119 4 20 <br /> Xylenes(total) 84.6 2.5 75.0 3.7 108 86-132 2 20 <br /> Surrogate:Dibromofluoromethane 5.25 5.00 105 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 4.99 5.00 100 74-135 <br /> Surrogate:Toluene-d8 5.32 5.00 106 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.48 5.00 110 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 wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 8 of 9 <br />