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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical {707)792 1865 <br /> . FAX equoi 792 0342 <br /> Wir www sequaialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11194,Tracy,Ca P308015 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/03 17 10 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lkmit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080169-EPA 5030 waters <br /> Laboratory Control Sample(3080169-BSI) Prepared&Analyzed 08/09/03 _ <br /> Tert-amyl methyl ether 5 03 l 0 u9/1 5 00 101 70-116 <br /> Benzene 544 0 50 5 00 109 81-118 <br /> Tert-butyl alcohol 106 20 100 106 62-142 <br /> Di-isopropyl ether 5 26 1 0 500 105 71-121 <br /> 1,2-Dibromoethane(EDB) 5 55 0 50 5 00 111 92-117 <br /> 1,2-Dichloroethane 5 16 0 50 5 00 103 79-126 <br /> Ethyl Cert-butyl ether 4 90 1 0 5 00 98 71-110 <br /> Methyl tent-butyl ether 5 00 0 50 5 00 100 77-123 <br /> Toluene 501 050 500 100 84-119 <br /> Surrogate Dibromofluoromethane 4 73 450 105 84-122 <br /> Surrogate 12-Dichloroethane-d4 450 450 100 74-135 <br /> rrogate Toluene-dS 4 81 450 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 68 450 104 86-119 <br /> Laboratory Control Sample Dup(3080169-BSD1) Prepred&Analyzed_08/09/03 <br /> Tert-amyl methyl ether 542 1 0 ug/1 500 108 70-116 7 20 <br /> Benzene 5 55 0 50 500 111 81-118 2 20 <br /> Tert-butyl alcohol 91 9 20 100 92 62-142 14 20 <br /> Di-isopropyl ether 5 33 1 0 500 107 71-121 1 20 <br /> 1 2-Dibromoethane(EDB) 593 050 500 119 92-117 7 20 Q-LIM <br /> 1,2-Dichloroelhane 549 050 500 110 79-126 6 20 <br /> Ethyl cert-butyl ether 5 18 1 0 500 104 71-110 6 20 <br /> Methyl Cert-butyl ether 534 050 500 107 77-123 7 20 <br /> Toluene 5 12 050 500 102 84-119 2 20 <br /> Surrogate Drbromofluoromethane 4 74 450 105 84-122 <br /> Surrogate 12-Dichloroethane-d4 453 450 101 74-135 <br /> Surrogate Toluene-d8 482 450 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 77 450 106 86-119 <br /> .Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ofcustody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 20 of 21 <br />