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a— ) (71455 McDowell Blvd North Ste A <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 07)792-1865 <br /> (707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/0417 13 <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 /> L � <br /> Batch 4030678-EPA 5030B waters �"ssGZ ,t, S�f trO- <br /> Matrix Spike(4030678-MS1Source P403351-01 ire aced&Analyzed 03/24/04 <br /> Tert-amyl methyl ether 66 6 10 ug/l 500 ND 133 78-117 QM01 <br /> Benzene 63 6 5 0 500 1 2 125 81-118 QM01 <br /> Tert-butyl alcohol 1210 200 1000 ND 12I 60-147 <br /> Di-isopropyl ether 76 8 10 500 ND 154 70-125 QM01 <br /> 1,2-Dibromoethane(EDB) 63 7 50 500 ND 127 85-125 QM01 <br /> 1,2-Dichloroethane 71 6 so Soo ND 143 77-126 QM01 <br /> Ethanol 1160 1000 1000 ND 116 55-200 <br /> Ethylbenzene 577 5 0 Soo ND 115 89-122 <br /> Ethyl tert-butyl ether 72 3 10 Soo ND 145 71-120 QM01 <br /> Methyl tert-butyl ether 273 5 0 500 200 146 70-122 QM04 <br /> Toluene 61 6 5 0 500 1 7 120 84-119 QM01 <br /> ]enes(total) 181 5 0 150 ND 121 86-132 <br /> rogale Dibromofluoromethane 604 500 121 84-122 <br /> Surrogate 12-Dichloroethane-d4 696 500 139 74-135 QM01 <br /> Surrogate Toluene-d8 522 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 566 500 113 86-119 <br /> Matrix 5 ike Du 4030678-MSDI) SourceP403351-0I Prepared&Analyzed 03/24/04 <br /> Tert-amyl methyl ether 63 8 0 ugA 500 ND 128 78-117 4 20 QM01 <br /> Benzene 59 4 50 500 1 2 116 81-118 7 20 <br /> Tert-butyl alcohol 1100 200 1000 ND 110 60-147 10 20 <br /> Di-isopropyl ether 70 8 10 500 ND 142 70-125 8 20 QM01 <br /> 1,2-Dibrornoethane(EDB) 59 2 5 0 500 ND 118 85-125 7 20 <br /> 1,2-Dichloroethane 67 4 5 0 500 ND 135 77-126 6 20 QM01 <br /> Ethanol 1100 1000 1000 ND 110 55-200 5 20 <br /> Ethylbenzene 55 9 5 0 500 ND 112 89-122 3 20 <br /> Ethyl Cert-butyl ether 669 10 500 ND 134 71-120 8 20 QM01 <br /> Methyl tert-butyl ether 244 5 0 500 200 88 70-122 11 20 <br /> Toluene 56 3 5 0 Soo 1 7 109 84-119 9 20 <br /> Xylenes(total) 172 5 0 150 ND 115 86-132 5 20 <br /> Surrogate Dibromofluoromethane 5 74 5 00 115 84-122 <br /> Surrogate 12-Dichloroethane-d4 655 500 131 74-135 <br /> Surrogate Toluene-d8 496 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 548 5 00 110 86-119 <br /> uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 14 of 15 <br />