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• 1455 McDowell Blvd North Ste D <br /> a' ) Sequoia Petaluma,CA 94954 <br /> Analytical (707)792-1865342 <br /> € FAX(707)792-0342 <br /> 9 , <br /> 6AW, www sequoialahs com <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P310474 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 11 41 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> lAnalyle Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3144829-EPA 5030 waters <br /> Blank(3]00829-BLK1) Prepared&Analyzed 10/31/03 <br /> Tert-amyl methyl ether ND 1 0 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1 2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> AMMkXylenes(total) ND 0 50 " <br /> arrogate Dibromofluoromethane 5 36 500 107 84-122 <br /> Surrogate 12-Dchloroethane-d4 5 92 500 118 74-135 <br /> Surrogate Toluene-d8 4 94 5 00 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 47 5 00 109 86-119 <br /> Laboratory Control Sample(3100829-BSI) Prepared&Analyzed 10/31/03 <br /> Tert-amyl methyl ether 5 56 1 0 119/1 5 00 111 70-116 <br /> Benzene 4 51 0 50 500 90 81-118 <br /> Tert-butyl alcohol 974 20 100 97 62-142 <br /> Di-isopropyl ether 5 82 1 0 500 116 71-121 <br /> 1 2-Dtbromoethane(EDB) 5 57 0 50 " 500 1 1 1 92-117 <br /> 1,2-Dtchloroethane 4 87 0 50 500 97 79-126 <br /> Ethanol 100 100 100 100 65-135 <br /> Ethylbenzene 5 41 050 500 108 89-122 <br /> Ethyl tert-butyl ether 5 72 1 0 500 114 71-110 Q-29 <br /> Methyl tert-butyl ether 5 97 0 50 500 119 77-123 <br /> Toluene 5 33 0 50 5 00 107 84-119 <br /> Xylenes(total) 15 3 0 50 I5 0 102 86-132 <br /> Surrogate Dtbromofluoromethane 506 500 101 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 5 04 500 101 74-135 <br /> Surrogate Toluene-d8 509 500 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 528 Soo 106 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 /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 9 of 11 <br />