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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma, <br /> A 94954 <br /> j a1865 <br /> rte► Analytical FAX(707)792-0342 <br /> www sequotalabs corn <br /> • <br /> URS Corp-Sacramento Prolect.Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/04 14 40 <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 4110667-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4110667-MSI) Source P411365-04 Prepared 11/26/04 Analyzed 11/27/04 <br /> Tert-amyl methyl ether 541 100 ugJl 500 ND 108 78-117 <br /> Benzene 4190 50 500 3500 138 81-118 BB LM <br /> Teri-butyl alcohol 9870 2000 10000 ND 99 60-147 <br /> Di-isopropyl ether 507 100 500 ND 101 70-125 <br /> 1,2-Dibromoethane(EDB) 560 50 500 ND 112 85-125 <br /> 1,2-13tchloroethanc 603 50 500 ND 121 77-126 <br /> Ethanol 8890 10000 10000 ND 89 55-200 <br /> Ethylbenzene 1690 50 500 1100 118 89-122 <br /> Ethyl tert-butyl ether 539 100 500 ND 108 71-120 <br /> Methyl tert-butyl ether 549 50 500 11 108 70-122 <br /> Toluene 1090 50 500 510 116 84-119 <br /> Xylenes(total) 4840 50 1500 3100 116 86-132 <br /> � <br /> urrogate Dibromofluoromethane 525 500 105 84-121 <br /> Surrogate 12-Dichloroethane-d4 516 " 500 105 74-135 <br /> Surrogate Toluene-d8 518 .500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 535 500 107 86-119 <br /> Matrix Spike Dup(4110667-MSD1) Source P411365-04 Prepared 11/26/04 Analyzed 11/27/04 <br /> Tert-amyl methyl ether 517 100 ug/l 500 ND 103 78-117 5 20 <br /> Benzene 4160 50 " 500 3500 132 81-118 0 7 20 BB,LM <br /> Tert-butyl alcohol 10400 2000 10000 ND 104 60-147 5 20 <br /> Di-isopropyl ether 511 100 500 ND 102 70-125 08 20 <br /> 1,2-Dibromoethane(EDB) 560 50 500 ND 112 85-125 0 20 <br /> 1,2-Dtchloroethane 575 50 500 ND 115 77-126 5 20 <br /> Ethanol 9780 10000 10000 ND 98 55-200 10 20 <br /> Ethylbenzene 1720 50 500 1100 124 89-122 2 20 LM <br /> Ethyl tert-butyl ether 517 100 500 ND 103 71-120 4 20 <br /> Methyl tert-butyl ether 524 50 500 11 103 70-122 5 20 <br /> Toluene 1090 50 500 510 116 84-119 0 20 <br /> Xylenes(total) 5000 50 1500 3100 127 86-132 3 20 <br /> Surrogate Dibromofluoromethane 5 41 500 108 84-122 <br /> Surrogate I 1-Dichloroethane-d4 514 500 103 74-135 <br /> Surrogate Toluene-d8 5 16 500 103 84-119 <br /> Surrogate 4-Bromofluorobenxene 544 500 109 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 16 of 19 <br />