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1455McDowPealuma CA 94954 <br /> lvd North Ste D <br /> la) Sequoia (707)792-1865 <br /> FAX equoi labs c 42 <br /> Analytical <br /> www sequoialahs 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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5030210-EPA 5030E waters/EPA 8260B <br /> Matrix Spike(5030210-MSI) Source P503196-01 Prepared&Analyzed 03/21/05 <br /> Tert-amyl methyl ether 481 1 0 ug/1 500 ND 96 78-117 <br /> Benzene 470 050 500 ND 94 81-118 <br /> Tert-bury]alcohol 106 20 100 ND 106 60-147 <br /> Di-isopropyl ether 467 1 0 500 ND 93 70-125 <br /> 1,2-Dtbromoethane(EDB) 534 050 500 ND 107 85-125 <br /> 1,2-Dichloroethane 468 050 500 ND 94 77-126 <br /> Ethanol 108 100 100 ND 108 55-200 <br /> Ethylbenzene 5 19 050 500 ND 104 89-122 <br /> Ethyl tert butyl ether 453 1 0 500 ND 91 71-120 <br /> Methyl tert-butyl ether 480 050 500 ND 96 70-122 <br /> Toluene 495 050 500 ND 99 84-119 <br /> AgKylenes(total) 153 050 " 150 ND 102 86-132 <br /> arrogate Dibromofluoromethane 439 500 88 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 433 500 87 74-135 <br /> Surrogate Toluene-d8 447 500 89 84-119 <br /> Surrogate 4-Bromofluorobenzene 463 500 93 86-119 <br /> Matrix Spike Dup(5030210-MSD]) Source P503196-01 Prepared&Analyzed 03/21/05 <br /> Tert amyl methyl ether 484 1 0 ug/l 500 ND 97 78-117 06 20 <br /> Benzene 464 050 500 ND 93 81-1 t 8 1 20 <br /> Tert-butyl alcohol 109 20 100 ND 109 60-147 3 20 <br /> Di-isopropyl ether 463 10 500 ND 93 70-125 09 20 <br /> 1,2 Dtbromoethane(EDB) 532 050 500 ND 106 85-125 04 20 <br /> 1,2-Dtchloroethane 466 050 500 ND 93 77-126 04 20 <br /> Ethanol 118 100 100 ND 118 55-200 9 20 <br /> Ethylbenzene 499 050 500 ND 100 89-122 4 20 <br /> Ethyl tert-butyl ether 454 1 0 500 ND 91 71-120 02 20 <br /> Methyl tert-butyl ether 482 050 500 ND 96 70-122 04 20 <br /> Toluene 496 050 500 ND 99 84-119 02 20 <br /> Xylenes(total) 15 1 050 150 ND 101 86-132 1 20 <br /> Surrogate Dibromofluoromethane 456 500 91 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 442 500 88 74-135 <br /> Surrogate Toluene-d8 466 500 93 84-119 <br /> Surrogate 4-Bromofluorobenzene 465 500 93 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 13 of 18 <br />