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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792 1865 <br /> • FAX CgUOL labs c 42 <br /> WWW sequoialabs com <br /> URS Cort-Sacramento Project BP Heritage 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 /> lAnatyle Result Limit Units Level Result %REC Limits RPD Limit Nates <br /> Batch 3080058-EPA 5030 waters <br /> Blank(3080058-BLKI) Prepared&Analyzed 08/05/03 <br /> Tert-amyl methyl ether ND 10 u8A <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 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> AMIlylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 446 450 99 84-112 <br /> Surrogate 12-Dichloroethane-d4 4 82 450 107 74-135 <br /> Surrogate Toluene-d8 500 4 50 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 480 450 107 86-119 <br /> Laboratory Control Sample(3080058-BSI) Prepared&Analyzed 08/05/03 <br /> Tert-amyl methyl ether 5 65 1 0 ug/I 5 00 113 70-116 <br /> Benzene 4 81 050 5 00 96 81-118 <br /> Tert-butyl alcohol 117 20 100 117 62-142 <br /> Di-isopropyl ether 5 00 1 0 5 00 100 71-121 <br /> 1,2-Dibromoethane(EDS) 4 85 0 50 5 00 97 92-117 <br /> 1,2-Dichloroethane 4 80 0 50 5 00 96 79-126 <br /> Ethyl tert-butyl ether 5 36 1 0 5 00 107 71-110 <br /> Methyl tert-butyl ether 5 31 0 50 5 00 106 77-123 1 <br /> Toluene 4 85 050 5 00 97 84-119 <br /> Surrogate Dibromofluoromethane 4 19 450 93 84-122 <br /> Surrogate 12-Dichloroethane-d4 443 450 98 74-135 <br /> Surrogate Toluene d8 4 95 450 110 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 01 450 111 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 slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 14 of 21 <br />