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1455 McDowell Blvd,North Ste D <br /> X11 Sequoia petaluma,CA 94954 <br /> (707)792-1865 <br /> FAX Analytical wwseq(707)792-0342342 <br /> www sequoialabs corn <br /> is <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P407056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 37 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source °/oREC RPD <br /> Analyte Result Limit Units Level Result °/oREC Limits RPD Limit Notes <br /> Batch 4070285-EPA 5030B waters <br /> Matrix Spike(4070285-MSI) Source P407065-01 Prepared&Analyzed 07/16/04 <br /> Tert amyl methyl ether 221 50 ug/l 250 ND 88 78-117 <br /> Benzene 220 25 250 ND 88 81-118 <br /> Tert-butyl alcohol 10200 1000 5000 1000 184 60-147 QMOI <br /> Di-isopropyl ether 217 50 250 ND 87 70-125 <br /> 1 2-Dibromoethane(EDB) 257 25 250 ND 103 85-125 <br /> 1,2 Dichloroethane 247 25 250 ND 99 77-126 <br /> Ethanol 6910 5000 5000 ND 138 55-200 <br /> Ethylbenzene 237 25 250 ND 95 89-122 <br /> Ethyl tert-butyl ether 208 50 250 ND 83 71-120 <br /> Methyl tert-butyl ether 247 25 250 2 3 98 70-122 <br /> Toluene 242 25 250 ND 97 84-119 <br /> ,dailens(total) 730 25 750 ND 97 86-132 <br /> rrogate Dibromofluoromethane 546 " 500 109 84-122 <br /> Surrogate 12-Dichloroeihan-d4 536 500 107 74-135 <br /> Surrogate Toluene-d8 533 500 107 84-119 <br /> Surrogate 4-Bromofluorobeniene 4 71 500 94 86-119 <br /> Matrix Spike Dup(4070285-MSD1) Source P407065-01 Prepared&Analyzed 07/16/04 <br /> Tert-amyl methyl ether 224 50 ug/l 250 ND 90 78-117 1 20 <br /> Benzene 217 25 250 ND 87 81-118 1 20 <br /> Tert-butyl alcohol 10100 1000 5000 1000 182 60-147 1 20 QM01 <br /> Di-isopropyl ether 211 50 250 ND 84 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 260 25 250 ND 104 85-125 1 20 <br /> 1,2-Dichloroethane 243 25 250 ND W 77-126 2 20 <br /> Ethanol 4240 5000 5000 ND 85 55-200 48 20 QC20 <br /> Ethylbenzene 233 25 250 ND 93 89-122 2 20 <br /> Ethyl tert butyl ether 199 50 250 ND 80 71-120 4 20 <br /> Methyl cert-butyl ether 243 25 250 2 3 96 70-122 2 20 <br /> Toluene 229 25 250 ND 92 84-119 6 20 <br /> Xylenes(total) 710 25 750 ND 95 86-132 3 20 <br /> Surrogate Dibromofluoromeihane 5 21 500 144 84-122 <br /> Surrogate 12-Dtchloroethane-d4 542 500 108 74-135 <br /> Surrogate Toluene-d8 5 33 5 00 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 83 Soo 97 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 10 of 12 <br />