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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> aIW FAX Analytical (707) <br /> (707)792-0342 <br /> www sequoia]abs com <br /> 40 <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P503073 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/16/05 14 19 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source "/WEC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 5030147-EPA 5030B waters/EPA 8260B <br /> Blank(5030147-BLKI) Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether ND 1 0 ugtl <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 10 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1 2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert butyl ether ND 10 " <br /> Methyl ten-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> arrogate Dibromofluoromethane 497 S 00 99 84-122 <br /> Surrogate 12 Dichloroethane-d4 504 5 00 101 74-135 <br /> Surrogate Toluene-d8 5 21 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 544 5 00 109 86-119 <br /> Laboratory Control Sample(5030147-BSI) Prepared&Analyzed 03/14/05 <br /> Tert amyl methyl ether 5 11 1 0 ug/l 500 102 78-117 <br /> Benzene 4 90 050 500 98 81-118 <br /> Tert-butyl alcohol 93 0 20 100 93 60-147 <br /> Di-isopropyl ether 527 1 0 500 105 70-125 <br /> 1,2-Dibromoethane(EDB) 506 050 500 101 85-125 <br /> 1,2-Dichloroethane 480 050 500 96 77-126 <br /> Ethanol 117 100 100 117 55-200 <br /> Ethylbenzene 4 97 050 500 99 89-122 <br /> Ethyl Cert butyl ether 5 11 1 0 500 102 71-120 <br /> Methyl tert-butyl ether 5 Is 050 Soo 103 70-122 <br /> Toluene 4 84 050 500 97 84-119 <br /> Xylenes(total) 15 4 050 15 0 103 86-132 <br /> Surrogate Drbromofluoromethane 515 500 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 5 08 5 00 102 74-135 <br /> Surrogate Toluene-d8 520 500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 45 5 00 109 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 15 of 19 <br />