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D4]455 McDow <br /> Sequoia Petahell Blvd North Ste <br /> una CA 949544 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Urnits RPD Lamit Notes <br /> Batch 5030140-EPA 5030B waters/EPA 8260B <br /> Blank(5030140-BLK1) Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1 2 Dibromoethane(EDB) ND 050 " <br /> 1,2 Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND to " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> urrogate Drbromofluoromethane 517 500 103 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 532 500 106 74-135 <br /> Surrogate Toluene d8 538 500 108 84-119 <br /> Surrogate 4-Bromofluorobenzene 546 500 109 86-119 <br /> Laboratory Control Sample(5030140-BSI) Prepared&Analyzed 03/14/05 <br /> Tert-amyl methyl ether 479 1 0 ug/1 500 96 78-117 <br /> Benzene 466 050 " 500 93 8I-118 <br /> Tert-butyl alcohol 923 20 100 92 60-147 <br /> Di-isopropyl ether 472 10 500 94 70-125 <br /> 1 2-Dibromoethane(EDB) 5 12 050 500 102 85-125 <br /> 1 2-Dichloroethane 4 80 0 50 500 96 77-126 <br /> Ethanol 186 100 100 186 55-200 <br /> Ethylbenzene 491 050 500 98 89-122 <br /> Ethyl tert-butyl ether 460 1 0 500 92 71-120 <br /> Methyl tert-butyl ether 486 050 500 97 70-122 <br /> Toluene 468 050 500 94 84-119 <br /> Xylenes(total) 145 050 IS 0 97 86-132 <br /> Surrogate Drbromofluoromethane 555 500 111 84-122 <br /> Surrogate 1 2-Drchloroethane d4 535 500 107 74-135 <br /> Surrogate Toluene-d8 529 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 541 500 108 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 /> I <br /> Page 13 of 19 <br />