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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865865 <br /> FAX(707)792 0342 <br /> Analytical www sequotalabs corn <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P311134 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR-36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/18/03 18 08 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPA <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3110310-EPA 5030 waters <br /> Blank(3110310-BLKI) Prepared&Analyzed 11/14/03 <br /> Tert-amyl methyl ether ND 10 ugll <br /> Benzene ND 050 " <br /> Tert-butyt alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(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 /> rrogate Di bromofluoromethane 4 70 450 104 84-122 <br /> Surrogate 12-Dichloroethane-d4 436 4 50 97 74-135 <br /> Surrogate Toluene-d8 5 04 450 112 84-119 <br /> Surrogate 4-Bromofluorobenzene 510 450 113 86-119 <br /> Laboratory Control Sample(3110310-BS1) Prepared&Analyzed 11/14/03 <br /> Tert-amyl methyl ether 453 1 0 ug/l 500 91 70-116 <br /> Benzene 467 050 500 93 81-118 <br /> Tert-butyl alcohol 101 20 100 101 62-142 <br /> Di-isopropyl ether 4 IS 10 500 83 71-121 <br /> 1,2-Dtbromoethane(EDB) 501 050 5 00 100 92-117 <br /> 1,2-Dichloroethane 437 050 500 87 79-126 <br /> Ethanol 144 100 100 144 65-135 Q-29 <br /> Ethylbenzene 4 87 050 500 97 89-122 <br /> Ethyl tert butyl ether 4 18 10 500 84 71-110 <br /> Methyl tert-butyl ether 4 33 050 500 87 77-123 <br /> Toluene 474 050 500 95 84-119 <br /> Xylenes(total) 148 050 15 0 99 86-132 <br /> Surrogate Dibromofluoromethane 4 70 450 104 84-122 <br /> Surrogate 12-Dichloroethane-d4 432 450 96 74-135 <br /> Surrogate Toluene-d8 5 10 450 113 84-119 <br /> Surrogate 4-Bromofluorobenzene 528 4 50 117 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chairs 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 I7 <br />