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1455 McDowell Blvd North Ste D <br /> / \ <br /> Sequoia Petaluma CA 94954 <br /> Q (707)792 1865 <br /> FAX Analytical wwseq 7ialabs 342 <br /> www seyuoialabs corn <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Sate 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <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 4120414-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4120414-MS1) Source P412205-01 Prepared&Analyzed 12/20/04 <br /> Tert amyl methyl ether 551 l 0 ug/1 500 ND 110 78-117 <br /> Benzene 469 050 500 ND 94 81-118 <br /> Tert-butyl alcohol 92 l 20 100 ND 92 60-147 <br /> Di-isopropyl ether 5 19 10 500 ND 104 70-125 <br /> 1 2-Dibromoethane(EDB) 5 04 050 500 ND 101 85-125 <br /> 1,2-Dichloroethane 542 0 50 500 ND 108 77 126 <br /> Ethanol 805 100 100 ND 80 55-200 <br /> Ethylbenzene 4 70 050 500 ND 94 89-122 <br /> Ethyl tert-butyl ether 532 1 0 500 ND 106 71-120 <br /> Methyl tert-butyl ether 116 050 500 56 120 70-122 <br /> Toluene 4 74 050 500 ND 95 84-119 <br /> Allilikylenes(total) 14 3 050 15 0 ND 95 86-132 <br /> urrogate Dibromofluoromethane 4 73 500 95 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 535 5 00 107 74-135 <br /> Surrogate Toluene-d8 484 500 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 491 500 98 86-119 <br /> Matrix Spike Dup(4120414-MSDI) Source P412205-01 Prepared&Analyzed 12/20/04 <br /> Tert-amyl methyl ether 5 51 1 0 ugll 500 ND 110 78-117 0 20 <br /> Benzene 4 84 0 50 500 ND 97 81-118 3 20 <br /> Tert-butyl alcohol 91 2 20 100 ND 91 60-147 1 20 <br /> Di isopropyl ether 5 14 1 0 500 ND 103 70 125 1 20 <br /> 1 2-Dibromoethane(EDB) 5 15 050 500 ND 103 85-125 2 20 <br /> 1 2-Dichloroethane 5 53 050 500 ND 111 77-126 2 20 <br /> Ethanol 102 100 l00 ND 102 55 200 24 20 RB <br /> Ethylbenzene 4 82 050 500 ND 96 89-122 3 20 <br /> Ethyl tert-butyl ether 5 It 1 0 5 00 ND 102 71-120 4 20 <br /> Methyl tert-butyl ether 11 1 0 50 500 5 6 110 70-122 4 20 <br /> Toluene 474 050 500 ND 95 84 119 0 20 <br /> Xylenes(total) 136 050 150 ND 91 86-132 5 20 <br /> Surrogate Dtbromofluoromethane 457 500 91 84 122 <br /> Surrogate 12-Dtchloroethane-d4 5 11 5 00 102 74-135 <br /> Surrogate Toluene-d8 484 500 97 84-119 <br /> Surrogate 4-Bromofluorobemene 496 500 99 86 119 <br /> Sequoia Analytical -Petaluma The results to this report apply to the samples analyzed to 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 to its entirety <br /> Page 17 of 21 <br />