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1455 McDowell Blvd,North Ste D <br /> 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 2093,Tracy,CA P412280 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/05/05 08 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %aREC RPD <br /> Analyte Result Limit Units Level Result %uREC Limits RPD Limit Notes <br /> Batch 4120496-EPA 5030B waters I BPA 8260B <br /> Matrix Spike(4120496-MS1) Source P412280-01 Prepared&Analyzed 12/24/04 <br /> Tert-amyl methyl ether 489 10 ug/l Soo ND 98 78-117 <br /> Benzene 424 050 500 ND 85 81-118 <br /> Tert-butyl alcohol 910 20 100 ND 91 60-147 <br /> Di-isopropyl ether 468 1 0 Soo ND 94 70-125 <br /> 1,2-Dibromoethane(EDB) 460 050 500 ND 92 85-I25 <br /> 1,2-Dichloroethane 479 050 500 ND 96 77-126 <br /> Ethanol 83 8 100 100 ND 84 55-200 <br /> Ethylbenzene 425 050 500 ND 85 89-122 LN <br /> Ethyl tert-butyl ether 475 10 500 ND 95 71-120 <br /> Methyl tert-butyl ether 998 050 500 5 1 98 70-122 <br /> Toluene 427 050 500 ND 85 84-119 <br /> Xylenes(total) 127 050 150 ND 85 86-132 LN <br /> �urrogate Dibromofluoromethane 470 500 94 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 517 500 103 74-135 <br /> Surrogate Toluene-d8 482 500 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 477 500 95 86-119 <br /> Matrix Spike Dup(4120496-MSDI) Source P412280-01 Prepared&Analyzed 12/24/04 <br /> Tert-amyl methyl ether 480 1 0 ug/I 500 ND 96 78-117 2 20 <br /> Benzene 4 15 050 500 ND 83 81-118 2 20 <br /> Tert-butyl alcohol 87 2 20 100 ND 87 60-147 4 20 <br /> Di-isopropyl ether 4 52 10 500 ND 90 70-125 3 20 <br /> 1 2-Dibromoethane(EDB) 449 050 500 ND 90 85-125 3 20 <br /> 1,2-Dichloroethane 479 050 500 ND 96 77-126 0 20 <br /> Ethanol 930 100 100 ND 93 55-200 10 20 <br /> Ethylbenzene 408 050 5 00 ND 82 89-122 4 20 LN <br /> Ethyl tert-butyl ether 461 1 0 500 ND 92 71-120 3 20 <br /> Methyl tent-butyl ether 9 95 050 500 5 1 97 70-122 0 3 20 <br /> Toluene 420 050 Soo ND 84 84-119 2 20 <br /> Xylenes(total) 12 6 0 50 150 ND 84 86-132 0 8 20 LN <br /> Surrogate Dibromofluoromethane 4 71 500 94 84-122 <br /> Surrogate 1 2-Diehloroethane-d4 500 5 Oil 100 74-135 <br /> Surrogate Toluene-d8 4 75 5 00 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 71 5 00 94 86-119 <br /> Sequoia Analytical-Petaluma The results m this report apply to the samples analyzed in accordance with the churn 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 7 of 8 <br />