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Sequoia e <br /> 1455 McDowell <br /> CA 949 d,North Ste4 <br /> ,1)— (707)792 1865 <br /> AnalyticalmIW FAX(707)792-0342 <br /> • www sequoialabs 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 Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 3080132-EPA 5030 waters <br /> Blank(3080132-BLKl) Prepared&Anal zed 08/07/03 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) 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 1 0 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Aftylenes(total) ND 0 50'IW " <br /> Surrogate Dibromofluorom ethane 4 71 450 105 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 76 450 106 74-135 <br /> Surrogate Toluene-d8 4 91 450 109 84-119 <br /> Surrogate 4-8romgf7uorobenzene 4 54 450 101 86-119 <br /> Laboratory Control Sample(3080132-BS1) Prepared&Analyzed 08/07/03 <br /> Tert-amyl methyl ether 5 15 1 0 ug/l 5 00 103 70-116 <br /> Benzene 5 58 050 500 112 81-118 <br /> Tert-butyl alcohol 104 20 100 104 62-142 <br /> Di-isopropyl ether 5 33 1 0 5 00 107 71-121 <br /> 1,2-Dibromoethane(EDB) 5 71 0 50 5 00 114 92-117 <br /> 1 2-Dichloroethane 5 51 0 50 5 00 110 79-126 <br /> Ethyl tert-butyl ether 5 05 1 0 5 00 101 71-110 <br /> Methyl teri-butyl ether 5 17 050 5 00 103 77-123 <br /> Toluene 5 26 050 5 00 105 84-119 <br /> Surrogate Dibromofluoromethane 4 81 450 107 84-121 <br /> Surrogate 12-Dichloroethane-d4 4 68 450 104 74-135 <br /> Surrogate Toluene-d8 4 73 450 105 84-119 <br /> Surrogate 4 Bromofluoro benzene 4 82 450 107 86-119 <br /> equoia 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 18 of 2 l <br />