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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GO$ZK-0002 Reported: ' <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 04/13/05 09:46 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control j <br /> Sequoia Analytical-Petaluma ! <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> 4 ' <br /> Batch 5040040-EPA 5030B waters 1 EPA 8260B <br /> Matrix Spike(5040040-MS1) Source:P504010-01 Prepared&Analyzed:04/05/05 <br /> Tert-amyl methyl ether 4.57 1.0 ugll 5.00 ND 91 78-117 <br /> Benzene 4.51 0.50 5.00 0.39 84 81-118 <br /> Tert-butyl alcohol 112 20 100 ND 112 60-147 <br /> Di-isopropyl ether 4.49 1.0 5.00 ND 90 70-125 <br /> 1,2-Dichloroethane 4.81 0.50 5.00 ND 96 77-126 <br /> Ethanol 127 100 100 ND I27 55-200 <br /> Ethylbenzene 4.57 0.50 5.00 0.13 89 89-122 <br /> Ethyl tert-butyl ether 4.36 1.0 5.00 ND 87 71-120 <br /> Methyl tert-butyl ether 5.13 0.50 5.00 0.40 95 70-122 <br /> Toluene 4.86 0.50 5.00 0.26 92 84-119 <br /> Xylenes(total) 13.6 0.50 15.0 0.32 89 86-132 <br /> Surrogate:Dibromofluoromethane 5.28 5.00 106 84-121 <br /> ;urrogate:l,2-Dichloroethane-d4 5.25 5.00 105 74-135 <br /> Surrogate:Toluene-d8 4.89 5.00 98 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.14 " 5.00 103 86-119 <br /> Matrix Spike Dup(5040040-MSDI) Source:P504010-01 Prepared&Analyzed:04/05/05 <br /> Tert-amyl methyl ether 4.96 1.0 ugA 5.00 ND 99 78-117 8 20 <br /> Benzene 5.11 0.50 5.00 0.39 94 81-118 10 20 <br /> Tert-butyl alcohol 114 20 100 ND 114 60-147 2 20 <br /> t <br /> Di-isopropyl ether 4.83 1.0 5.00 ND 97 70-125 7 20 <br /> 1,2-Dichloroethane 5.30 0.50 5.00 ND 106 77-126 10 20 <br /> Ethanol 140 100 100 ND 140 55-200 10 20 <br /> Ethylbenzene 5.13 0.50 5.00 0.13 100 89-122 12 20 <br /> Ethyl tert-butyl ether 4.66 1.0 5.00 ND 93 71-120 7 20 <br /> Methyl tort-butyl ether 5.38 0.50 5.00 0.40 100 70-122 5 20 <br /> Toluene 5.34 0.50 5.00 0.26 .102 84-119 9 20 <br /> Xylenes(total) 15.4 0.50 15.0 0.32 101 86-132 12 20 <br /> Surrogate.,Dibromofluoromethane 5.18 5.00 106 84-121 <br /> Surrogate:1,1-Dichloroethane-d4 5.29 5.00 106 74-135 <br /> Surrogate:Toluene-d8 5.00 5.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.03 5.00 101 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 22 of 29 <br /> 3 <br />