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1455 McDowell Blvd,Nortb Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,!D (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs Com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrtm-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 /> Analyte Result Limit Units Level Result %uREC Ldmlts RPD Limit Notes <br /> Batch 5010120- EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample(5010120-BSI) Prepared&Analyzed 01/10/05 <br /> Tert amyl methyl ether 477 10 um Soo 95 78-117 <br /> Benzene 488 050 Soo 98 81-118 <br /> Tert-butyl alcohol 91 3 20 100 91 60-147 <br /> Di isopropyl ether 487 1 0 500 97 70-125 <br /> 1,2-Dichloroethane 520 050 Soo 104 77-126 <br /> Ethanol 264 100 100 264 55-200 HL <br /> Ethylbenzene 524 050 500 105 89-122 <br /> Ethyl tert-butyl ether 474 1 0 500 95 71-120 <br /> Methyl tert butyl ether 472 050 500 94 70-122 <br /> Toluene 503 050 500 101 84-119 <br /> Xylenes(total) 15 8 050 150 105 86-132 <br /> Surrogate Dibromofluoromethane 512 500 104 84-111 <br /> Surrogate 12-Dichloroethane-d4 508 „ 500 101 74-135 <br /> Surrogate Toluene d8 528 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 548 500 110 86-119 <br /> Matrix Spike(5010120-MSI) Source P412479-10 Prepared&Analyzed 01/10/05 <br /> Tert amyl methyl ether 243 50 ugll 250 ND 97 78-117 <br /> Benzene 248 25 250 3 0 98 81 118 <br /> Tert bury]alcohol 4050 1000 5000 ND 81 60-147 <br /> Di-isopropyl ether 249 50 250 ND 100 70-125 <br /> 1,2-Dtchloroethane 248 25 250 ND 99 77-126 <br /> Ethanol 1320 5000 5000 ND 26 55-200 LN <br /> Ethylbenzene 254 25 250 ND 102 89-122 <br /> Ethyl tert-butyl ether 246 50 250 ND 98 71-120 <br /> Methyl tert butyl ether 1220 25 250 970 100 70-122 <br /> Toluene 244 25 250 4 3 96 84-119 <br /> Xylenes(total) 764 25 750 ND 102 86-132 <br /> Surrogate Dibromofluoromethane 525 5 00 105 84-122 <br /> Surrogate 12-Dichloroethane-d4 511 5 00 104 74-135 <br /> Surrogate Toluene-d8 518 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 04 5 00 101 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 27 of 33 <br />