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' 1455 McDowell Blvd North Ste D <br /> 4 D (707)Sequoia Petaluma,CA 94954 792 1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequotalabs coin <br /> URS Corti-Sacramento Project Arco Site 6020,Manteca,CA P312071 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/22/03 13 19 <br /> Volatile Orgamc Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120260-EPA 5030B waters <br /> Laboratory Control Sample Du 3120260-BSD1 Prepared&Analyzed 12/09/03 <br /> Tert-amyl methyl ether 5 25 1 0 ug/l 5 00 105 70-116 6 20 <br /> Benzene 5 41 0 50 500 108 81-118 6 20 <br /> Tert-buty]alcohol 117 20 100 117 62-142 2 20 <br /> Di-isopropyl ether 5 31 1 0 5 00 106 71-121 8 20 <br /> 1,2-Dibromoethane(EPB) 5 43 0 50 500 109 92-117 6 20 <br /> 1,2-Dtchloroethane 5 10 0 50 5 00 102 79-126 8 20 <br /> Ethanol 85 4 100 100 85 65-135 11 20 <br /> Ethylbenzene 5 83 0 50 500 117 89-122 3 20 <br /> Ethyl tert-butyl ether 5 05 1 0 500 101 71-110 7 20 <br /> Methyl tent-butyl ether 5 21 0 50 5 00 104 77-123 9 20 <br /> Toluene 5 36 0 50 500 107 84-119 3 20 <br /> ylenes(total) 179 0 50 15 0 119 86-132 1 20 <br /> rrogate Dibromofluoromethane 5 72 600 95 84-122 <br /> Surrogate 12-Dtchloroethane-d4 5 62 600 94 74-135 <br /> Surrogate Toluene-0 607 6 00 101 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 99 600 100 86-119 <br /> Batch 3120274-EPA 5030B waters <br /> Blank(3120274-BLKl) Prepared&Analyzed 12/10/03 <br /> Tert-amyl methyl ether ND 1 0 ugA <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl ter-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 <br /> Surrogate Dibromofluorom ethane 4 83 450 107 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 4 80 450 107 74-135 <br /> Surrogate 7'oluene-d8 499 450 711 84-119 <br /> Surrogate 4-Bromofluorobenzene 500 450 111 86-119 <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed to accordance with the chain <br /> • of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page 15 of 17 <br />