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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> FAX� Analytical wwseq(707)792-0342 <br /> om <br /> www sequoialabs coni <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy CA P412386 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number GO9JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/11/05 08 02 <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 Limas RPD Limit Notes <br /> Batch 5010022-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample Dup(5010022-BSD1) Prepared&Analyzed 01/04/05 <br /> Tert-amyl methyl ether 1 07 1 0 ugll 1 00 107 78-117 3 20 <br /> Benzene 0 944 050 1 00 94 81-118 1 20 <br /> Tert-butyl alcohol 177 20 20 0 88 60-147 06 20 <br /> Di isopropyl ether 1 02 10 1 00 102 70-125 2 20 <br /> 1,2-Dtbromoethane(EDB) 0 900 050 1 00 90 85 125 4 20 <br /> 1 2 Dtchloroethane 0 971 050 1 00 97 77 126 03 20 <br /> Ethanol 265 100 200 132 55-200 3 20 <br /> Ethylbenzene 0 938 050 1 00 94 89-122 03 20 <br /> Ethyl tert-butyl ether 0 985 10 1 00 98 71-120 03 20 <br /> Methyl tert-butyl ether 0 959 050 1 00 96 70-122 2 20 <br /> Toluene 101 050 100 101 84-119 3 20 <br /> Alftylenes(total) 292 050 300 97 86 132 2 20 <br /> urrogate Dibromofluoromethane 4 77 500 95 84-122 <br /> Surrogate 12-Dtchloroethane-d4 457 500 91 74-135 <br /> Surrogate Toluene-d8 531 500 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 513 .500 103 86-119 <br /> Batch 5010096-EPA 5030B waters 1 EPA 8260B <br /> Blank(5010096-BLK1) Prepared&Analyzed 01/07/05 <br /> Tert-amyl methyl ether ND 1 0 ugll <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> DL isopropyl ether ND l 0 " <br /> 1 2-Dtbromoethane(EDB) ND 050 " <br /> 1 2 Dtchloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 5 16 500 103 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 532 5 00 106 74-135 <br /> Surrogate Toluene-d8 5 19 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 42 5 00 108 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 slated results are reported on a wet weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 13 of!5 <br />