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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma, 79 94954 <br /> -1865 <br /> �► Analytical (707)792-1865 <br /> 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 Analytical-Petaluma <br /> Reporting Spike Source "/.REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4100134-EPA 5030B waters 1 EPA 8260B <br /> Matnx Spike(4100134-MSI) Source P409529-04 Prepared&Analyzed 10/06/04 <br /> Tert-amyl methyl ether 545 10 ug/I 500 ND 109 78-117 <br /> Benzene 501 050 500 ND 100 81-118 <br /> Tert-butyl alcohol 930 20 100 ND 83 60-147 <br /> Di-isopropyl ether 171 10 500 12 102 70-125 <br /> 1 2-Dibroinciethane(EDB) 539 050 500 ND 108 85-125 <br /> 12-Dichloroethane 511 050 500 ND 102 77-126 <br /> Ethanol 181 100 100 26 155 55-200 <br /> Ethylbenzene 556 050 500 ND 111 89-122 <br /> Ethyl tert-butyl ether 529 10 500 ND 106 71-120 <br /> Methyl tert-butyl ether 571 050 500 079 98 70-122 <br /> Toluene 535 050 500 ND 107 84-119 <br /> --Xylenes(total) 170 050 150 ND 113 86-132 <br /> 119we Dibromofluoromethane 535 500 107 84-112 <br /> Surrogate I 1-Dichloroethane-d4 524 500 105 74-135 <br /> Surrogate Toluene-d8 550 500 110 84-119 <br /> Surrogate 4-Bromofluorobenzene 540 500 108 86-119 <br /> Matnx Spike Dup(4100134-MSDI) Source P409529-04 Prepared&Analyzed 10/06/04 <br /> Tert-amyl methyl ether 560 10 ug/1 500 ND 112 78-117 3 20 <br /> Benzene 4 93 050 5 00 ND 99 81-118 2 20 <br /> Tert-butyl alcohol 84 9 20 100 ND 85 60-147 2 20 <br /> Di-isopropyl ether 17 0 10 500 12 100 70-125 0 6 20 <br /> 1,2-Dibromoethane(EDB) 546 050 500 ND 109 85-125 1 20 <br /> 1 2-Dichloroethane 5 14 050 500 ND 103 77-126 06 20 <br /> Ethanol 172 100 100 26 146 55-200 5 20 <br /> Ethylbenzene 539 050 500 ND 108 89-122 3 20 <br /> Ethyl tert-butyl ether 540 10 500 ND 108 71-120 2 20 <br /> Methyl tert-butyl ether 606 050 500 0 79 105 70-122 6 20 <br /> Toluene 525 050 500 ND 105 84-119 2 20 <br /> Xylenes(total) 16 6 050 150 ND 111 86-132 2 20 <br /> Surrogate Dibromofluoromethane 533 500 107 84-122 <br /> Surrogate I 1-Dichloroethane-d4 535 Soo 107 74-135 <br /> Surrogate Toluene-d8 5 51 500 110 84-119 <br /> Surrogate 4-Bromofluorobenzene 530 " 500 106 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 20 of 21 <br />