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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792.1865 <br /> Analytical <br /> FAX(707)792.0342 <br /> . www.sequoialabs.coin <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <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 4010112-EPA 5030E waters <br /> Blank(40I0112-ELK_1) - Prepared&Analyzed:01/08/04 <br /> Xylenes(total) ND 0.50 ugA <br /> Surrogate:Dibromofluoromethane 5.11 5.00 102 84-122 <br /> Surrogate: 1,2-Dichloroelhane-d4 5.01 5.00 100 74-135 <br /> Surrogate: Toluene-d8 4.06 5.00 81 84-119 S-LIM <br /> Surrogate:4-Bromofluoro benzene 5.20 5.00 104 66-119 <br /> Laboratory Control Sample(4010112-BSI) Prepared&Analyzed:01/08/04 _ <br /> Tort-amyl methyl ether 5.36 1.0 ag/I 5.00 - 107 78-117 <br /> Benzene 6.12 0.50 5.00 122 81-118 Q-LIM <br /> Tert-butyl alcohol 108 20 100 108 60-147 <br /> Di-isopropyl ether 5.12 1,0 5,00 102 70-125 <br /> ] 2-Dibromoethane(EDB) 5.61 0.50 5.00 112 85-125 <br /> 42-Dichloroethane 5.81 0.50 5.00 116 77-126 <br /> 1thanoi E28 t00 100 128 55-200 <br /> Ethylbenzene 5.35 0.50 5.00 107 89-122 <br /> Ethyl tert-butyl ether 5.12 LO 5.00 102 71-120 <br /> Methyl tert-butyl ether 5.56 0.50 5.00 111 70-122 <br /> Toluene 5.00 0.50 5.00 100 84-119 <br /> Xylenes(total) 15.1 0.50 15.0 101 86-132 <br /> Surrogate:Dibromofluoromethane 5.19 5.00 104 84-122 <br /> Surrogate: l,2-Dichloroethane-d4 5.57 5.00 111 74-135 <br /> Surrogate: Toluene-d8 5.28 5.00 106 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.05 5.00 101 86-119 <br /> Laboratory Control Sample Dnp(4010112-BSDt) Prepared&Analyzed:01/08/04 <br /> Tert-amyl methyl ether 5.25 1.0 ugfl 5.00 105 78-117 2 20 <br /> Benzene 6.78 0.50 5.00 136 81-118 10 20 Q-LIM <br /> Tert-butyl alcohol 104 20 100 104 60-147 4 20 <br /> Di-isopropyl ether 4.72 1.0 5.00 94 70-125 8 20 <br /> 1,2-Dibromoethane(EDB) 5.05 0.50 5.00 101 85-125 11 20 <br /> 1,2-Dichloroethane 5.09 0.50 5,00 102 77-126 13 20 <br /> Ethanol 141 100 100 141 55-200 10 20 <br /> Ethylbenzene 4.93 0.50 5.00 99 89-122 8 20 <br /> Ethyl tert-butyl ether 4,56 1.0 5,00 91 71-120 12 20 <br /> Methyl tort-butyl ether 4.88 0.50 5,00 98 70-122 13 20 <br /> Toluene 4.56 0.50 5,00 91 84-1I9 9 20 <br /> Xylencs(total) 14.5 0.50 15.0 97 86-132 4 20 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of cuslody document, Unless otherwise stated, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety, <br /> Page 34 of 40 <br />