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1455 McDowell Blvd,North Ste 4 <br /> r <br /> ta) Sequoia Petal(707)792-1865 <br /> IW Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> t <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/09/04 18 12 <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 Limns RPD Limit Notes <br /> Batch 3120714-EPA 5030B waters <br /> Laboratory Control Sample Dup(3120714-BSDI) Prepared 12/25/03 Analyzed 12/26/03 <br /> Tert-amyl methyl ether 450 10 ug/l 500 90 78-117 7 20 <br /> Benzene 496 050 500 99 81-118 2 20 <br /> Tert-butyl alcohol 950 20 100 95 60-I47 0 6 20 <br /> Di isopropyl ether 504 10 5 00 101 70-125 2 20 <br /> 1 2-Dibromoethane(CDB) 4 94 050 500 99 85-125 5 20 <br /> 1 2-Dichloroethane 5 31 050 500 106 77-126 0 6 20 <br /> Ethanol 966 100 100 97 55-200 1 20 <br /> Ethylbenzene 5 16 050 500 103 89-122 0 2 20 <br /> Ethyl tert bury!ether 469 10 500 94 71-120 5 20 <br /> Methyl tert-butyl ether 466 050 500 93 70-122 5 20 <br /> Toluene 498 050 500 too 84-119 1 20 <br /> lenes(total) 15 1 050 IS 0 101 86-132 3 20 <br /> arrogate Drbromofluoromethane 513 500 103 84-122 <br /> Surrogate 1 2-Drchloroetharie-d4 520 500 104 74-135 <br /> Surrogate Toluene-d8 481 500 96 84-119 <br /> Surrogate 4 Bromofluorobenzene 515 500 103 86-119 <br /> Batch 3120719-EPA 5030B waters <br /> Blank(3124719-BLKI) Prepared&Analyzed 12/27/03 <br /> Tent-amyl methyl ether ND 10 ugA <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 10 " <br /> 12-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <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 /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 417 450 93 84-122 <br /> Surrogate 12-Drchloroerhane-d4 4 40 450 98 74-135 <br /> Surrogate Toluene-d8 4 59 456 102 84-119 <br /> Surrogate 4-Bromof7uorobenzene 4 60 450 102 86-119 <br /> equola Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the charm of <br /> custody document Unless otherx rse stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 17 <br />