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-.- - - -- - T - - <br /> ir, TOW <br /> Sequoia 1455 McDowell Blvd,North Sto D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> • www,sequoialabs.com <br /> l <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: fay Johnson 06/30/04 13:08 <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 4060423-EPA 5030B waters <br /> Matrix Spike 4060423-MS1 Source:P406178-09 Prepared&Analyzed:06/18/04 <br /> Tert-amyl methyl ether 5.58 1.0 ug/l 5.00 ND 112 78-117 <br /> Benzene 5.87 0.50 5.00 ND 117 81-118 <br /> Tert-butyl alcohol 113 20 100 ND 113 60-147 <br /> Di-isopropyl ether 6.48 1.0 5.00 1.1 108 70-125 <br /> 1,2-Dibromoethane(EDB) 5.33 0.50 5.00 ND 107 85-125 <br /> 1,2-Dichloroethane 12.2 0.50 1. 5.00 5.3 138 77-126 QM01 <br /> Ethanol 106 100 " 100 ND 106 55-200 <br /> Ethylbenzene 5.53 0.50 5.00 ND 111 89-122 <br /> Ethyl tert-butyl ether 5.55 1.0 5.00 ND 1 1 l 71-120 <br /> Methyl tert-butyl ether 10.2 0.50 5.00 4.2 120 70-122 <br /> Toluene 5.30 0.50 5.00 ND 106 84-119 <br /> ylenes(total) 15.8 0.50 15.0 ND 105 86-132 <br /> urrogate:Dibromofluoromethane 5.79 " 5.00 116 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 5.99 5.00 120 74-135 <br /> Surrogate: Toluene-d8 5.13 5.00 103 84-119 <br /> Surrogate: 4-Bromofluorobenzene 5.10 5.00 102 86-119 <br /> Matrix Spike Dup(4060423-MSM) _Source:P406179-09_ Prepared&Analyzed:06/18/04 <br /> y Y 5.41 1.0 ug11 5.0 <br /> Tert-am I methyl ether fl ND !0$ 78-117 3 20 <br /> Benzene 5.78 0,50 5,00 ND 116 81-118 2 20 <br /> Tert-butyl alcohol 134 20 100 ND 134 60-147 17 20 <br /> Di-isopropyl ether 6.46 1.0 5.00 1.1 107 70-125 0.3 20 <br /> 1,2-Dibromoethane(EDB) 5.18 0.50 5.00 ND 104 85-125 3 20 <br /> 1,2-Dichloroethane 11.6 0.50 5.00 5.3 126 77-126 5 20 <br /> Ethanol 121 100 100 ND 121 55-200 13 20 <br /> Ethylbenzene 5.76 0.50 5.00 ND 115 89-122 4 20 r <br /> Ethyl tert-butyl ether 5.48 1.0 " 5.00 ND 110 71-120 1 20 <br /> Methyl tert-butyl ether 9.95 0,50 5.00 4.2 115 70-122 2 20 <br /> a <br /> Toluene 5.44 0.50 5.00 ND 109 84-119 3 20 <br /> Xylenes(total) 16.1 0.50 15.0 ND 107 86-132 2 20 <br /> Surrogate: Dibromofluoromethane 5.53 5,00 111 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 5.72 " 5.00 114 74-1.35 <br /> Surrogate: Toluene-d8 5.08 11 5.00 102 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.20 5.00 104 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise slated,results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety, <br /> I <br /> Page 24 of 37 <br />