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1455 McDowell Blvd,North Ste D <br /> a_ _� Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <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 limn Notes <br /> Batch 5010138-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample(5010138-BS1) Prepared&Analyzed 01/11/05 <br /> Tert-amyl methyl ether 454 10 ugfl 500 91 78-117 <br /> Benzene 446 0 50 500 89 51-118 <br /> Tert-butyl alcohol 88 7 20 100 89 60-147 <br /> Di isopropyl ether 4 53 10 Soo 91 70-125 <br /> 1,2-Dichloroethane 4 56 050 Soo 91 77-126 <br /> Ethanol 128 100 100 128 55-200 <br /> Ethylbenzene 4 37 050 5 00 87 89-122 HM <br /> Ethyl tert-butyl ether 432 1 0 5 00 86 71-120 <br /> Methyl tert-butyl ether 4 57 050 500 91 70-122 <br /> Toluene 439 050 Soo 88 84-119 <br /> Xylenes(total) 13 7 050 15 0 91 86-132 <br /> Surrogate Dibromofluoromethane 4 96 500 99 84-121 <br /> Sa-urrogate 12-Dichloroethane-d4 4 76 500 95 74-135 <br /> Surrogate Toluene-d8 537 500 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 15 5 00 103 86-119 <br /> Matrix Spike(5010138-MSI) Source P501061-09 Prepared&Analyzed 01/11/05 <br /> Tert-amyl methyl ether 520 1 0 ug/I 5 00 ND 104 78-117 <br /> Benzene 539 050 500 ND 108 81-118 <br /> Tert-butyl alcohol 94 1 20 IOD ND 94 60-147 <br /> Di-isopropyl ether 527 1 0 500 ND 105 70-125 <br /> 1,2-Dichloroethane 508 050 500 ND 102 77-126 <br /> Ethanol 109 100 100 ND 109 55-200 <br /> Ethylbenzene 531 050 500 ND 106 89-122 <br /> Ethyl tert-butyl ether 497 1 0 500 ND 99 71-120 <br /> Methyl tert-butyl ether 752 050 500 2 5 100 70-122 <br /> Toluene 529 050 500 ND 106 84-119 <br /> Xylenes(total) 168 050 150 ND 112 86-132 <br /> Surrogate Dibromofluoromethane 5 00 500 100 84-112 <br /> Surrogate I 1-Dichloroethane-0 480 500 96 74-135 <br /> Surrogate Toluene-d8 537 500 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 507 500 101 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 bases <br /> This analytical report must be reproduced in its entirety <br /> Page 29 of 33 <br />