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.Y Se 1455 McDowell blvd North Ste <br /> quoia Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical <br /> FAX(707)7920342 <br /> www sequoia]abs coin <br /> • <br /> URS Corp-Sacramento project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <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 Limit Notes <br /> Batch 4070035- EPA 5030B waters <br /> Blank(4070035-BLK1) Prepared&Analyzed 07/02/04 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND l 0 " <br /> 1,2-Dibromoethane(EBB) ND 0 50 " <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 0 50 " <br /> Toluene ND 050ft " <br /> es(total) ND 050 " <br /> ogate Dibromofluoromethane 499 .500 100 84-122 <br /> Surrogate 12-Dichloroethane-d4 485 500 97 74-135 <br /> Surrogate Toluene-d8 514 5 00 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 529 500 106 86-119 <br /> Laboratory Control Sample(4070035-BSI) Prepared&Analyzed 07/02/04 <br /> Tert-amyl methyl ether 5 08 1 0 ug/l 500 102 78-117 <br /> Benzene 524 050 500 105 81-118 <br /> Tert-butyl alcohol 986 20 100 99 60-147 <br /> Di-isopropyl ether 5 15 1 0 500 103 70-125 <br /> 1,2-Dibromoethane(EDB) 5 79 050 5 00 116 85-125 <br /> 1 2-Dichloroethane 5 02 050 500 100 77-126 <br /> Ethanol 924 100 100 92 55-200 <br /> Ethylbenzene 5 14 050 500 103 89-122 <br /> Ethyl tert-butyl ether 5 01 l 0 500 100 71-120 <br /> Methyl tert-butyl ether 479 0 50 500 96 70-122 <br /> Toluene 542 0 50 5 00 108 84-119 <br /> Xylenes(total) 165 050 15 0 110 86-132 <br /> Surrogate Dibromofluoromethane 4 72 .500 94 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 72 500 94 74-135 <br /> Surrogate Toluene-d8 497 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 98 500 100 86-119 <br /> uota 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 18 <br />