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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma CA 949544 <br /> (707)792-1865 <br /> Analytical FAX792-0342 <br /> www scqequoiuoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <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 5030212-EPA 5030B waters/EPA 8260B <br /> Blank(5030212-BLKI) Prepared&Analyzed 03/21/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1 2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Aftlenes(total) ND 050 " <br /> arrogate Drbromofluoromethane 5 80 5 00 116 84-122 <br /> Surrogate 12-Drchloroethane-d4 593 5 00 119 74-135 <br /> Surrogate Toluene-d8 529 5 00 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 552 5 00 110 86-119 <br /> Laboratory Control Sample(5030212-BSI) Prepared&Analyzed 03/21/05 <br /> Tert-amyl methyl ether 5 14 10 ug/l 500 103 78-117 <br /> Benzene 500 050 Soo 100 81-118 <br /> Tert-butyl alcohol 105 20 100 105 60-147 <br /> Di-isopropyl ether 4 80 1 0 500 96 70-125 <br /> 1 2-Dibromoethane(EDB) 534 050 500 107 85-125 <br /> 1 2-Drchloroethane 546 050 500 109 77-126 <br /> Ethanol 221 100 100 221 55-200 HL <br /> Ethylbenzene 523 050 500 105 89-122 <br /> Ethyl tert-butyl ether 4 83 1 0 500 97 71-120 <br /> Methyl tert-butyl ether 520 050 500 104 70-122 <br /> Toluene 5 17 050 500 103 84-119 <br /> Xylenes(total) 157 050 15 0 105 86-132 <br /> Surrogate Dibromofluoromethane 580 500 116 84-122 <br /> Surrogate 12-Dichloroethane-d4 545 5 00 109 74-135 <br /> Surrogate Toluene-d8 528 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 529 500 106 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 /> This analytical report must be reproduced in its entirety <br /> Page 14 of 18 <br />