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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA94954 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequmalahs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %aREC RPD <br /> Analyte Result Limit Units Level Result °/oREC limits RPD Limit Notes <br /> Batch 5030223-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5030223-MSI) Source P503177-03 Prepared&Analyzed 03/22/05 <br /> Tert-amyl methyl ether 474 to ug/l 500 ND 95 78-117 <br /> Benzene 485 050 500 ND 97 81-118 <br /> Tert-bury]alcohol 115 20 100 63 109 60-147 <br /> Di-isopropyl ether 475 10 500 ND 95 70-125 <br /> l 2-Dibromoethane(EDB) 503 050 500 ND 101 85-125 <br /> 1,2-Dichloroethane 508 050 500 ND 102 77-126 <br /> Ethanol 921 100 100 ND 92 55-200 <br /> Ethylbenzene 5 14 050 500 013 100 89-122 <br /> Ethyl tert-butyl ether 442 1 0 500 ND 88 71-120 <br /> Methyl tert-butyl ether 4 95 050 500 031 93 70-122 <br /> Toluene 5 12 050 500 ND 102 84-119 <br /> A�ylenes(total) 15 4 050 I S 0 031 101 86-132 <br /> arrogate Dibromofluoromethane 499 5 00 100 84-122 <br /> Surrogate 12-Dichloroethane-d4 502 5 00 100 74-135 <br /> Surrogate Toluene-d8 487 5 00 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 494 5 00 99 86-119 <br /> Matrix Spike Dup(5030223-MSD]) Source P503177-03 Prepared&Analyzed 03/22/05 <br /> Tert-amyl methyl ether 505 l 0 ug/l 5 00 ND 101 78-117 6 20 <br /> Benzene 504 050 500 ND 101 81-118 4 20 <br /> Tert-butyl alcohol 118 20 100 6 3 112 60-147 3 20 <br /> Di-isopropyl ether 499 10 5 00 ND 100 70-125 5 20 <br /> 1,2-Dibromoethane(EDB) 543 0 50 500 ND 109 85-125 8 20 <br /> 1,2-Dichloroethane 531 050 Soo ND 106 77-126 4 20 <br /> Ethanol 101 100 too ND 101 55-200 9 20 <br /> Ethyibenzene 537 050 500 013 105 89-122 4 20 <br /> Ethyl tert-butyl ether 477 10 5 00 ND 95 71-120 8 20 <br /> Methyl tert-butyl ether 534 050 500 031 101 70-122 8 20 <br /> Toluene 538 050 500 ND 108 84-119 5 20 <br /> Xylenes(total) 163 050 150 031 107 86-132 6 20 <br /> Surrogate Dibromofluoromethane 482 500 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 495 500 99 74-13S <br /> Surrogate Toluene-d8 483 500 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 501 500 100 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 17 of 18 <br />