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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> ■ _ W�r `1 (707)792 1865 <br /> FAX Analytical wwseq 7) labsco2 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 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 4120463-EPA 5030B waters 1 EPA 8260B <br /> Matrix Spike(4120463-MSI) Source P412182-05 Prepared&Analyzed 12/22/04 <br /> Tert-amyl methyl ether 567 1 0 ug/l 500 ND 113 78-117 <br /> Benzene 497 050 Soo ND 99 81-118 <br /> Tert-butyl alcohol 106 20 100 ND 106 60-147 <br /> Di-isopropyl ether 561 10 500 ND 112 70-125 <br /> 1 2-Dibromoethane(EDB) 5 33 050 500 ND 107 85-125 <br /> 1 2-Dichloroethane 579 050 500 ND 116 77-126 <br /> Ethanol 133 100 100 38 95 55-200 <br /> Ethylbenzene 4 72 050 500 ND 94 89-122 <br /> Ethyl tert butyl ether 563 10 500 ND 113 71-120 <br /> Methyl tert-butyl ether 605 0 50 500 ND 121 70-122 <br /> Toluene 483 050 500 ND 97 84-119 <br /> lenes(total) 131 050 150 ND 87 86-132 <br /> rrogate Dibromofluoromethane 493 500 99 84-122 <br /> Surrogate 1 2-Dwhloroethane-d4 538 500 108 74-135 <br /> Surrogate Toluene-d8 4S8 500 98 84-119 <br /> Surrogate 4-Bromofluorobenzene 494 500 99 86-119 <br /> Matrix Spike Dup(4120463-MSDI) Source P412182-05 Prepared&Analyzed 12/22/04 <br /> Tert-amyl methyl ether 586 1 0 ugll 500 ND 117 78-117 3 20 <br /> Benzene 4 80 050 500 ND 96 81-118 3 20 <br /> Tert-butyl alcohol 108 20 100 ND 108 60-147 2 20 <br /> Di-isopropyl ether 5 58 1 0 500 ND 112 70-125 0 5 20 <br /> 1 2-Dibromoethane(EDB) 541 0 50 500 ND 108 85-125 1 20 <br /> 1,2-Dichloroethane 5 72 050 500 ND 114 77-126 1 20 <br /> Ethanol 132 loo 100 38 94 55-200 0 8 20 <br /> Ethylbenzene 4 76 050 500 ND 95 89-122 0 8 20 <br /> Ethyl tert-butyl ether 563 10 500 ND 113 71-120 0 20 <br /> Methyl tert-butyl ether 5 81 0 50 500 ND 116 70-122 4 20 <br /> Toluene 4 84 0 50 500 ND 97 84-119 0 2 20 <br /> Xylenes(total) 14 5 050 150 ND 97 86-132 10 20 <br /> Surrogate Dibromofluoromethane 520 5 00 104 84-122 <br /> Surrogate 12-Dichloroethane-d4 581 500 116 74-135 <br /> Surrogate Toluene-d8 506 500 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 10 500 102 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wtih 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 19 of 21 <br />