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�ro <br /> 1455 McDowell Blvd,North Ste D <br /> (D Sequoia Petaluma,CA 94954 <br /> (707)792-1665 <br /> W Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P401434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Dumber WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/11/04 16 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 Luntt Notes <br /> Batch 4020192-EPA 5030B waters <br /> Laboratory Control Sample(4020192-BSI) Prepared&Analyzed 02/09/04 <br /> Ten-amyl methyl ether 463 1 0 ug/l 500 93 78-117 <br /> Benzene 494 0 50 500 99 81-118 <br /> Tert-butyl alcohol 137 20 100 137 60-147 <br /> Di-isopropyl ether 4 85 10 5 00 97 70-125 <br /> Ethanol 166 100 100 166 55-200 <br /> Ethylbenzene 525 050 5 00 105 89-122 <br /> Ethyl tert-butyl ether 449 1 0 5 00 90 71-120 <br /> Methyl tent butyl ether 462 050 5 00 92 70-122 <br /> Toluene 4 84 050 500 97 84-119 <br /> Xylenes(total) 15 7 0 50 15 0 105 86-132 <br /> Surrogate Drbromofluoromethane 4 15 450 92 84-122 <br /> wsurrrr'o'g-le <br /> gate 12-Dlchloroethane-d4 356 4 50 79 74-135 <br /> Toluene-d8 4 41 4 50 98 84-119 <br /> Laboratory Control Sample Dup(4020192-BSD1) Prepared&Analyzed 02/09/04 <br /> Tert-amyl methyl ether 460 1 0 ug/l 500 92 78-117 0 7 20 <br /> Benzene 477 050 500 95 81-118 4 20 <br /> Tert-butyl alcohol 119 20 100 119 60-147 14 20 <br /> Di-isopropyl ether 4 89 10 500 98 70-125 0 8 20 <br /> Ethanol 162 100 100 162 55-200 2 20 <br /> Ethylbenzene 491 050 500 98 89-122 7 20 <br /> Ethyl tert-butyl ether 4 54 1 0 5 00 91 71-120 1 20 <br /> Methyl tert butyl ether 4 62 0 50 5 00 92 70-122 0 20 <br /> Toluene 4 68 0 50 500 94 84-119 3 20 <br /> Xylenes(total) 14 8 050 150 99 86-132 6 20 <br /> Surrogate Dtbromofluoromethane 427 4 50 95 84-122 <br /> Surrogate 12-Dlchloroethane-d4 3 79 450 84 74-135 <br /> Surrogate Toluene-0 446 4 50 99 84-119 <br /> •Sequoia Analytical -Petaluma The results to 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 13 of 14 <br />