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th <br /> Sequoia ]455McDowPetaaluma,,CCA 4t9 4 <br /> a— ) {707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Protect Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-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 /> Analyto Result Limit Units Level Result %REC limits RPD Limit Notes <br /> Batch 5010012-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5010012-MSI) Source P412423-06 Prepared&Analyzed 01/03/05 <br /> Tert-amyl methyl ether 547 10 ug/l 5 00 ND 109 78-117 <br /> Benzene 462 0 50 500 0 082 91 81-118 <br /> Tert-butyl alcohol 867 20 l00 ND 87 60-147 <br /> Di-isopropyl ether 477 10 " 500 ND 95 70-125 <br /> 1,2-Dtchloroethane 579 0 50 5 00 12 92 77-126 <br /> Ethanol 121 100 " 100 ND 121 55-200 <br /> Ethylbenzene 482 050 " 500 ND 96 89-122 <br /> Ethyl tert-butyl ether 496 1 0 500 ND 99 71 120 <br /> Methyl tert-butyl ether 482 050 5 00 0 10 94 70-122 <br /> Toluene 480 050 500 ND 96 84-119 <br /> Xylenes(total) 148 050 " 150 ND 99 86-132 <br /> Surrogate Dibromofluoromethane 4 78 500 96 84-122 <br /> arrogate 12 Drchloroethane-d4 458 500 92 74-135 <br /> Surrogate Toluene-d8 5 22 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 523 500 105 86-119 <br /> Matrix Spike Dup(5010012-MSD1) Source P412423-06 Prepared&Analyzed 01/03/05 <br /> Pert-amyl methyl ether 582 10 ug/1 500 ND 116 78-117 6 20 <br /> Benzene 4 84 0 50 500 0 082 95 81-118 5 20 <br /> I <br /> Tert-butyl alcohol 90 6 20 100 ND 91 60-147 4 20 <br /> Di-isopropyl ether 487 to 5 00 ND 97 70-125 2 20 <br /> 1,2-Diehloroethane 600 0 50 5 00 12 96 77-126 4 20 <br /> Ethanol 138 100 100 ND 138 55-200 13 20 <br /> Ethylbenzene 4 89 050 500 ND 98 89-122 1 20 <br /> Ethyl tert-butyl ether 5 10 10 500 ND 102 71-120 3 20 <br /> Methyl tert-butyl ether 497 0 50 500 010 97 70-122 3 20 <br /> Toluene 502 050 500 ND 100 84-119 4 20 <br /> Xylenes(total) 154 050 ISO ND 103 86-132 4 20 <br /> Surrogate Dtbromofluoromethane 4 76 500 95 84-122 <br /> Surrogate 12 Drchloroethane-d4 469 5 00 94 74-135 <br /> Surrogate Toluene-d8 536 5 00 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 535 5 00 107 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 as entrrery <br /> Page 21 of 33 <br />