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1455 McDowell Blvd North Ste D <br /> -.�..-� Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> 42 <br /> Analytical wwsequAX ialabs om <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy CA P412386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/11/05 08 02 <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 %nREC Limits RPD Limit Notes <br /> Batch 5010096-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample(5010096-BS1) Prepared&Analyzed 01/07/05 <br /> Tert-amyl methyl ether 5 10 1 0 ug/l 500 102 78-117 <br /> Benzene 5 12 050 500 102 81-118 <br /> Tert-butyl alcohol 82 8 20 100 83 60-147 <br /> Di-Isopropyl ether 521 1 0 500 104 70-125 <br /> 1 2 Dibromoethane(EDB) 524 0 50 500 105 85-125 <br /> 1,2-Dichloroethane 526 050 " 500 105 77-126 <br /> Ethanol 213 100 100 213 55-200 HL <br /> Ethylbenzene 534 050 500 107 89-122 <br /> Ethyl tert-butyl ether 4 84 1 0 500 97 71-120 <br /> Methyl tent-butyl ether 4 97 0 50 500 99 70-122 <br /> Toluene 5 19 050 500 104 84-119 <br /> lenes(total) 159 050 IS 0 106 86-132 <br /> urrogate Dibromofluoromethane 523 5 00 105 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 508 500 102 74-135 <br /> Surrogate Toluene-d8 520 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 536 5 00 107 86-119 <br /> Laboratory Control Sample Dup(5010096-BSD1) Prepared&Analyzed 01/07/05 <br /> Tert-amyl methyl ether 5 10 1 0 ug/l 500 102 78-117 0 20 <br /> Benzene 538 050 500 108 81-118 5 20 <br /> Tert-butyl alcohol 88 0 20 100 88 60 147 6 20 <br /> Di-isopropyl ether 528 1 0 500 106 70 125 1 20 <br /> 1 2-Dibromoethane(EDB) 525 0 50 500 105 85-125 0 2 20 <br /> 1 2-Dlchloroethane 554 0 50 500 111 77-126 5 20 <br /> Ethanol 84 4 100 100 84 55-200 86 20 BA <br /> Ethylbenzene 550 050 500 110 89-122 3 20 <br /> Ethyl tert butyl ether 506 1 0 500 101 71-120 4 20 <br /> Methyl ten butyl ether 530 050 500 106 70-122 6 20 <br /> Toluene 544 050 500 109 84-119 5 20 <br /> Xylenes(total) 165 0 50 15 0 110 86-132 4 20 <br /> Surrogate Dibromofluoromethane 539 5 00 108 84-122 <br /> Surrogate 1 1-Dichloroeihane-d4 532 5 00 106 74-135 <br /> Surrogate Toluene-d8 532 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 523 S 00 105 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 14 of 15 <br />