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1455 McDowell Blvd Nortb Ste D <br /> ,!D Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792.0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia AnalyticaI -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result LAMA Units Level Result "/REC Limits RPD Limit Notes <br /> Batch 4100101 -EPA 5030B waters/EPA 8260B <br /> Matnx Spike(4100101-MSI) Source P409434-03 Prepared&Analyzed 10/05/04 <br /> Tert-amyl methyl ether 541 to ugll 500 ND 108 78-117 <br /> Benzene 503 050 500 ND 101 81-118 <br /> Tert-butyl alcohol 876 20 100 ND 88 60-147 <br /> Di-isopropyl ether 506 10 500 ND 101 70-125 <br /> 1,2-Dibromoethane(EDS) 560 050 Soo ND 112 85-125 <br /> 1,2-Dichloroethane 5 11 050 500 ND 102 77-126 <br /> Ethanol 116 100 100 ND 116 55-200 <br /> Ethylbenzene 567 050 500 ND 113 89-122 <br /> Ethyl tert-butyl ether 523 10 500 ND 105 71-120 <br /> Methyl cert-butyl ether 5 36 050 500 ND 107 70-122 <br /> Toluene 541 050 500 ND 108 84-119 <br /> .111111111�ylcnes(total) 173 050 150 ND 115 86-132 <br /> rrogate Dibramofluoromethane 537 Soo 107 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 544 500 109 74-135 <br /> Surrogate Toluene-d8 583 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 553 500 111 86-119 <br /> Matrix Spike Dup(4100101-MSDI) Source P409434-03 Prepared&Analyzed 10/05/04 <br /> Tert-amyl methyl ether 554 10 ug/I 500 ND 111 78-117 2 20 <br /> Benzene 498 050 500 ND 100 81-118 1 20 <br /> Tert-butyl alcohol 87 1 20 100 ND 87 60-147 06 20 <br /> Di-isopropyl ether 5 11 10 Soo ND 102 70-125 1 20 <br /> 1 2-Dibromoethane(EDB) 555 050 500 ND 111 85-125 09 20 <br /> 1,2-Dichloroethane 5 14 050 500 ND 103 77-126 0 6 20 <br /> Ethanol 130 100 100 ND 130 55 200 11 20 <br /> Ethylbenzene 545 050 500 ND 109 89-122 4 20 <br /> Ethyl tert-butyl ether 525 10 500 ND 105 71-120 04 20 <br /> Methyl tert-butyl ether 544 050 500 ND 109 70-122 1 20 <br /> Toluene 532 050 500 ND 106 84-119 2 20 <br /> Xylenes(total) 16 8 050 150 ND 112 86-132 3 20 <br /> Surrogate Dibromofluoromethane 545 300 109 84-122 <br /> Surrogate 12-Dichloroethane-d4 550 500 110 74-135 <br /> Surrogate Toluene-d8 587 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 554 500 111 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 18 of 21 <br />