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r5 <br /> c� 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> .� <br /> Analytical (707)7921865 <br /> FAX(707)792-0342 <br /> WWW sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308085 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 34 <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 Lunt Notes <br /> Batch 3080130-EPA 5030 waters <br /> Blank(3080130-BLKI) Prepared&Analyzed 08/07/03 <br /> Tert-amyl methyl ether ND 10 ugli <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> arrogate Dibromofluoromethane 684 600 114 84-122 <br /> Surrogate 12-Dichloroethane-d4 6 85 600 114 74-135 <br /> Surrogate Toluene-d8 630 6 00 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 672 6 00 112 86-119 <br /> Laboratory Control Sample(3080130-BSI) Prepared&Analyzed 08/07/03 <br /> Tert amyl methyl ether 4 90 to ug/l 5 00 98 70-116 <br /> Benzene 524 050 500 105 81-118 <br /> Tert-butyl alcohol 112 20 100 112 62-142 <br /> Di-isopropyl ether 5 17 10 500 103 71-121 <br /> 1,2 Dibromoethane(EDB) 533 050 5 00 107 92-117 <br /> 1,2 Dichloroethane 5 82 050 500 116 79-126 <br /> Ethyl tert butyl ether 493 10 500 99 71-110 <br /> Methyl ter[-butyl ether 492 050 500 98 77-123 <br /> Toluene 4 61 050 5 00 92 94-119 <br /> Surrogate Dtbromofluoromethane 6 78 6 00 113 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 6 80 600 113 74-135 <br /> Surrogate Toluene-d8 621 600 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 6 70 600 112 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 13 of 19 <br />