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1455 McDowell Blvd,North Ste D <br /> ® Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> . IW Analytical FAX(707)792-0342 <br /> www sequmalabs com <br /> URS Corp-Sacramento Project Arco Site 434,Lodi,CA P310098 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50433 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/15/03 16 54 <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 3100252-EPA 5030 waters <br /> Blank(3100252-BLK1) Prepared&Analyzed 10/10/03 <br /> Tert-amyl methyl ether ND 1 0 ug/l <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 too " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> rogate Drbromofluoromethane 4 87 5 00 97 84-121 <br /> Surrogate 12-Dichloroethane d4 4 73 5 00 95 74 135 <br /> Surrogate Toluene-d8 436 500 87 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 63 500 93 86-119 <br /> Laboratory Control Sample(3100252-BSI) Prepared&Analyzed 10/10/03 <br /> Tert-amyl methyl ether 4 83 1 0 ug/l 500 97 70-116 <br /> Benzene 5 06 0 50 500 101 81-118 <br /> Tert-butyl alcohol 95 6 20 100 96 62-142 <br /> Di-isopropyl ether 477 10 500 95 71-121 <br /> 1,2 Dibromoethane(EDB) 522 050 Soo 104 92-117 <br /> 1,2-Dichloroethane 5 14 050 5 00 103 79-126 <br /> Ethanol 900 100 too 90 65-135 <br /> Ethylbenzene 5 14 050 500 103 89-122 <br /> Ethyl tert-butyl ether 4 78 1 0 500 96 71-110 <br /> Methyl tert-butyl ether 4 53 050 500 91 77-123 <br /> Toluene 5 10 050 5 00 102 84-119 <br /> Xylenes(total) 154 050 I S 0 103 86-132 <br /> Surrogate Drbromofluoromethane 433 500 91 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 5) 500 90 74-135 <br /> Surrogate Toluene-d8 447 500 89 84-119 <br /> Surrogate 4-Bromofluorobenzene 469 500 94 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 8 of 10 <br />