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Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma,CA 949544 <br /> (707)792 1665 <br /> Analytical 7j 792-0342 <br /> • wwwww sequequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404354 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/28/04 16 54 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source /gREC RPD <br /> Analyte Result Limit Units <br /> Level Result %REC Limits RPD Limit Notes <br /> Batch 4040616-EPA 5030 sods IY o (i lid <br /> Matrix Spike(4040616-MSI) Source P404402-04 Prepared&Analyzed 04/24/04 <br /> Tert-amyl methyl ether 0 0466`,.x0 0150 mg/kg 00500 ND 93 74-126 <br /> Benzene 00443 00050 00500 ND 89 75-123 <br /> Ter(-butyl alcohol 0 840 0 10 100 ND 84 66-129 <br /> Di-isopropyl ether 00467 00050 00500 ND 93 71-127 <br /> 1,2-Dihromoethane(EDB) 00471 00050 00500 ND 94 88-118 <br /> 1,2-Dichloroethane 00473 00050 00500 ND 95 79-119 <br /> Ethanol 0657 020 100 ND 66 70-140 —QM02— <br /> Ethylbenzene 00449 00050 00500 ND 90 65-135 <br /> Ethyl tert-butyl ether 00469 00050 00500 ND 94 72-123 <br /> Methyl tert-butyl ether 00454 0 0050 00500 ND 91 70-125 <br /> Toluene 00416 0 0050 00500 ND 83 76-123 <br /> 0rrogale Drhramofluoromethane 00501 00500 100 81-126 <br /> rrogate I 1-Diehloroethane-d4 00487 00500 97 73-131 <br /> Surrogate Toluene-d8 00533 00500 r 07 82-129 <br /> Matrix Spike Dup(4040616-MSD]) Sourc P404402-04 )or repared&Analy d 04/24/04 <br /> Tert-amyl methyl ether 0 0468 -060 mg/kg 00500 ND 94 74-126 0 4 35 <br /> Benzene 00428 0 0050 00500 ND 86 75-123 3 35 <br /> Tert-butyl alcohol 0 835 010 1 00 ND 84 66-129 0 6 35 <br /> Di-isopropyl ether 00465 0 0050 00500 ND 93 71-127 0 4 35 <br /> 1,2-Dibromoethane(EDB) 00470 0 0050 00500 ND 94 88-118 0 2 35 <br /> 1,2-Dtchloroethane 00462 0 0050 00500 ND 92 79-119 2 35 e <br /> Ethanol 0 603 020 100 ND 60 70-140 9 35j Q 2 <br /> Ethylbenzene 00429 00050 00500 ND 86� 65-135 5 35 <br /> Ethyl tert-butyl ether 00486 00050 00500 ND 97 72-123 4 35 <br /> Methyl tert-butyl ether 00474 00050 00500 ND 95 70-125 4 35 <br /> Toluene 00394 00050 00500 ND 79 76-123 5 35 <br /> Surrogate Dibrotnofluoromethane 00521 00500 104 81-126 <br /> Surrogate 1 2-Drchloroethane-d4 00510 00500 102 73-131 <br /> Surrogate Toluene-d8 00529 00500 106 82-129 <br /> S quota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the charn of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 46This analytical report must be reproduced in its entirety <br /> Page 12 of 13 <br />