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(i) (707) <br /> 1455 Mcbowell Blvd North SteSequoia Petaluma,CA 949544792-1865 <br /> TW Analytical FAX(707)792 0342 <br /> Iswww sequotalabs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P310466 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon]? Elarth 11/04/03 16 09 <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 Lmmit Notes <br /> Batch 3100778-EPA 5030 waters <br /> Blank(3100778-BLKI) Prepared&Analyzed 10/30/03 <br /> Tert-amyl methyl ether ND 1 0 ug/1 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 516 500 103 84-122 <br /> Oarrogate 12-Dichloroethane-d4 582 Soo 116 74-135 <br /> arrogate Toluene d8 512 500 102 84-119 <br /> Laboratory Control Satn le(3100778-BSI) Prepared&Analyzed 10/30/03 <br /> Tert-amyl methyl ether 539 10 ug/l 500 108 70-116 <br /> Benzene 548 050 500 110 81-118 <br /> Tert-butyl alcohol 101 20 100 101 62-142 <br /> Di-isopropyl ether 525 1 0 5 00 105 71-121 <br /> Ethanol 704 100 100 70 65-135 <br /> Ethylbenzene 5 89 050 500 118 89-122 <br /> Ethyl tert-butyl ether 579 1 0 500 116 71-110 Q-29 <br /> Methyl tert-butyl ether 522 050 5 00 104 77-123 <br /> Toluene 558 0 50 500 112 84-119 <br /> Xylenes(total) 162 050 15 0 108 86-132 <br /> Surrogate Dtbromofluoromethane 553 .500 111 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 566 500 113 74-135 <br /> Surrogate Toluene-d8 531 500 106 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 14 <br />