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Sequoia ]455McDowPetaaluma,CA 49 4 <br /> a— ) (707)792-1865 <br /> r Analytical FAX(707)792.0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P409398 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/05/04 15 26 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-PetaIuma <br /> Reporting Spike Source %uREC RPD <br /> Analyie Result Lmit Units Level Result %uREC Limits RPD Limit Notes <br /> Batch 4100055-EPA 5030B waters/EPA 8260B <br /> Matnx Spike(4100058-MS1) Source P409397-18 Prepared&Analyzed 10/04/04 <br /> Tert-amyl methyl ether 24 1 50 ugll 250 ND 96 78-117 <br /> Benzene 245 25 250 029 97 81-118 <br /> Tert-butyl alcohol 462 I00 500 ND 92 60-147 <br /> Di-isopropyl ether 230 50 250 ND 92 70-125 <br /> 1 2-Dibromoethane(EDB) 23 1 25 250 ND 92 85-125 <br /> 1,2-Dichloroethane 116 25 250 94 88 77-126 <br /> Ethanol 417 500 500 ND 83 55-200 <br /> Ethylbenzene 240 25 250 PID 96 89-122 <br /> Ethyl tert-butyl ether 222 5 0 250 ND 89 71-120 <br /> Methyl tert-butyl ether 22 5 2 5 " 250 ND 90 70 122 <br /> Toluene 255 25 250 ND 102 84-119 <br /> Xylenes(total) 739 25 750 ND 99 86-132 <br /> ,agate Drbromofluoromeilrane 454 500 91 84-122 <br /> Surrogate 1 2-Dichloroethane d4 4 74 500 95 74-135 <br /> Surrogate Toluene-d8 519 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 491 Soo 98 86-119 <br /> Matrix Spike Dup(4100058-MSDI) Source P409397-18 Prepared&Analyzed 10/04/04 <br /> Tert-amyl methyl ether 282 50 ugli 250 ND 113 78-117 16 20 <br /> Benzene 273 25 250 029 108 81-118 11 20 <br /> Teri butyl alcohol 515 100 500 ND 103 60-147 11 20 <br /> Di-isopropyl ether 275 so 250 ND 110 70-125 18 20 <br /> 1,2-Dibromoethane(EDB) 263 25 250 ND 105 85-125 13 20 <br /> 1,2-Dichloroethane 130 25 250 94 144 77 126 11 20 LM <br /> Ethanol 455 500 500 ND 91 55-200 9 20 <br /> Ethylbenzene 275 25 250 ND 110 89-122 14 20 <br /> Ethyl tert-butyl ether 267 5 0 250 ND 107 71-120 18 20 <br /> Methyl tert-butyl ether 268 25 " 250 ND 107 70-122 17 20 <br /> Toluene 289 2 5 250 ND 116 84-119 12 20 <br /> Xylenes(total) 83 9 25 750 ND 112 86-132 13 20 <br /> Surrogate Dibromofluoromethane 503 500 101 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 499 500 100 74-135 <br /> Surrogate Toluene-d8 550 500 110 84-119 <br /> Surrogate 4-Bromof7uorobenzene 520 500 104 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 /> 0 This analytical report must be reproduced in its entirety <br /> Page 7 of 8 <br />