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J9 <br /> a <br /> 1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> a— ) (707)792-1865 <br /> r <br /> Analytical FAX(707)792-0342 <br /> www se4uoialabs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P307501 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/11/03 13 44 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Uuits Level Result %REC Limits RPD Limit Notes <br /> Batch 3070681-EPA 5030 waters <br /> Blank 3070681-BLKI Prepared&Analyzed 07/31/03 <br /> Tert-amyl methyl ether ND 1 0 u8A <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoetbane(EDB) ND 0 50 " <br /> 1,2-Dichloroelbane ND 0 50 <br /> Ethanol ND 100 " <br /> i <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tort-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> AdKylenes(total) ND 0 50 " <br /> urrogate Dibromofluoromethane 5 11 450 114 84-121 <br /> Surrogate 12-Dichloroethane-d4 4 63 450 103 74-135 <br /> Surrogate Toluene-d8 446 450 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 3 81 450 85 86-119 S-LIM <br /> Laboratory Control Sample 3070681-BS1Prepared&Analyzed 07/31/03 <br /> Tert-amyl metbyl ether 4 88 1 0 ug/l 500 98 70-116 <br /> Benzene 5 48 0 50 500 110 81-118 <br /> Tert-butyl alcohol 111 20 100 111 62-142 <br /> Di-isopropyl ether 5 07 1 0 500 101 71-121 <br /> 1,2-Drbromoethane(EDB) 5 74 050 5 00 115 92-117 <br /> 1,2-Diebloroethane 5 62 050 5 00 112 79-126 <br /> Ethyl tert-butyl ether 494 1 0 5 00 99 71-110 <br /> Methyl tert-butyl ether 524 050 " 500 105 77-123 <br /> Toluene 574 050 500 115 84-119 <br /> Surrogate Dibromofluoromethane 528 450 117 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 81 450 107 74-135 <br /> Surrogate Toluene-d8 452 450 100 84-119 <br /> Surrogate 4-Bromof7uorobenzene 4 58 450 102 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 9 <br />