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1455 McDowell Blvd,North Ste D <br /> Sequoia(D— FAX Petaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> (707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11194,Tracy,Ca P308015 <br /> 2870 Gateway Oaks Dnve 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 /> Laboratory Control Sample Du 3080132-BSD1 Prepared&Analyzed 08/07/03 <br /> Tert-amyl methyl ether 5 58 1 0 ug/I 5 00 112 70-116 8 20 <br /> Benzene 576 0 50 Soo 115 81-118 3 20 <br /> Tert-butyl alcohol 95 9 20 100 96 62-142 8 20 <br /> Di-isopropyl ether 5 57 1 0 500 111 71-121 4 20 <br /> 1,2-Dibromoethane(EDB) 5 99 050 500 120 92-117 5 20 Q-LIM <br /> 1,2-Dichloroethane 5 69 0 50 5 00 114 79-126 3 20 <br /> Ethyl tert-butyl ether 5 44 1 0 5 00 109 71-110 7 20 <br /> Methyl tert-butyl ether 5 55 0 50 5 00 111 77-123 7 20 <br /> Toluene 5 47 050 5 00 109 84-119 4 20 <br /> Surrogate Dibromafluoromethane 497 450 110 84-122 <br /> *Urr:g.': <br /> gate 1 2-Dichloroethane d4 492 ;i 450 109 74-135 <br /> te Toluene d8 4 92 450 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 86 450 108 86-119 <br /> Batch 3080169-EPA 5030 waters <br /> Blank(3080169-BLK1) Prepared&Analyzed 08/09/03 <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-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <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 /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 4 76 450 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 73 450 105 74-135 <br /> Surrogate Toluene-d8 480 450 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 442 450 98 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 of its entirety <br /> Page 19 of 2l <br />