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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> 4D (707)792 1865 <br /> Analytical FAX e 792 0 <br /> www squoiquotalabs co792 <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <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 Lima Notes <br /> Batch 5030210-EPA 5030B waters 1 EPA 8260B <br /> Blank(5030210-BLK1) Prepared&Analyzed 03/21/05 <br /> Ten-amyl methyl ether ND 1 0 ugll <br /> Benzene ND 0 50 " <br /> Ten-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 1 0 " <br /> 1,2-Drbromoethane(EDB) ND 050 " <br /> 1 2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> lenes(total) ND 0 50 <br /> urrogate Dibromofluaromethane 4 84 500 97 84-122 <br /> Surrogate 12-Drchloroethane-d4 4 82 500 96 74-135 <br /> Surrogate Toluene-d8 494 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 529 5 00 106 86-119 <br /> Laboratory Control Sample(5030210-BSI) Prepared&Analyzed 03/21/05 <br /> Tert-amyl methyl ether 5 11 10 ugll 500 102 78-117 <br /> Benzene 500 050 500 100 81-118 <br /> Tert-butyl alcohol 112 20 100 112 60-147 <br /> Di-isopropyl ether 489 10 500 98 70-125 <br /> 1 2-Dibromoethane(EDB) 5 38 050 5 00 108 85-125 <br /> 1,2 Drchloroethane 524 050 5 00 105 77-126 <br /> Ethanol 98 6 100 100 99 55-200 <br /> Ethylbenzene 540 050 5 00 108 89-122 <br /> Ethyltert-butylether 467 l 0 500 93 71-120 <br /> Methyl tert-butyl ether 494 050 500 99 70-122 <br /> Toluene 544 050 500 109 84-119 <br /> Xylenes(total) 15 7 050 15 0 105 86-132 <br /> Surrogate Drbromofluoromethane 5 00 5 00 100 84-122 <br /> Surrogate 11-Drchloroethane-d4 486 5 00 97 74-135 <br /> Surrogate Toluene-d8 5 00 5 00 100 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 82 5 00 96 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 in its entirety <br /> Page 12 of 18 <br />