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�j Sequoia 1455McDowell Blvd- <br /> ufna,CNorth 49154 <br /> te b <br /> Pelalumq CA 94454 <br /> (707)792 1865 <br /> Analytical FAX(701)792 0342 <br /> www segtuonlabs coin <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton CA P411025 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA 95670 Project Manager(lusty Benkosky 01/04/05 11 35 <br /> Volatile Organic Compounds by EPA Method 8260E- 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 4110095-EPA 5030B waters I EPA 8260B <br /> Blank(4110095-BLKI) Prepared&Analyzed 11/03/04 <br /> Tert amyl methyl ether ND 10 u9A <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 <br /> Di-tsopropyl ether ND 10 " <br /> 12 Dibromocthanc(EDB) ND 050 " <br /> 12 Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tent butyl ether ND 10 " <br /> Methyl tett-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 • <br /> Surrogate Drbromofluoromahone 525 500 105 84-122 <br /> Surrogate 12 Dichloroethane-d4 335 " 500 107 74 135 <br /> Surrogate Toluene-d8 371 500 114 84-119 <br /> Surrogate 4-Bromofluorobenzene 513 Soo 103 86-119 <br /> Laboratory Control Sample(4110095-BSI) Prepared&Analyzed 11/03/04 <br /> Tart-amyl methyl ether 566 10 ito 500 113 78-117 <br /> Be117;ue 577 050 " 500 115 81 118 <br /> Tert butyl alcohol 813 20 100 81 60-147 <br /> Ds-isopropyl ether 547 10 500 109 70-125 <br /> 1 2-Dibromoethane(EDB) 528 050 500 106 85-125 <br /> 1 2 Dichloroethane 527 050 500 105 77-126 <br /> Ethanol 132 100 100 132 55 200 <br /> Ethylbenzene 551 050 5 00 110 89-122 <br /> Ethyl tert-butyl ether 564 10 Soo 113 71-120 <br /> Methyl tert-butyl ether 603 050 500 121 70-122 <br /> Toluene 552 050 500 l t0 84 119 <br /> Xylenes(total) 169 050 150 112 86 132 <br /> Surrogate Dibromofluoromethane 543 500 109 84 122 <br /> Surrogate 12 Drchloroethane-& 521 500 104 74435 <br /> Surrogate Taluene-l8 586 500 117 84-119 <br /> -Surrogate 4-Bromofluorobenzene- _- -_-_ _ 508 — _ - -5 00 - - 101 86 119 <br /> Sequoia Analytical-Petaluma The resulis rn 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 7of9 <br />