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t. <br /> a— ) (7orth Ste <br /> Sequoia 1455McDowp�lama CA 94954 <br /> Analytical FAX <br /> 07)792-1845 <br /> (707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 1 t 191,Stockton,Ca P401434 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number 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 Lunit Notex <br /> Batch 4020169-EPA 5030B waters <br /> Laboratory Control Sample Dup(4020169-BSD1) Prepared&Analyzed 02/07/04 <br /> Tert-amyl methyl ether 540 1 0 ug/1 500 108 78-117 12 20 <br /> Benzene 533 050 5 00 107 81-118 4 20 <br /> Tert-butyl alcohol 119 20 100 119 60-147 9 20 <br /> Di-isopropyl ether 571 10 500 114 70-125 5 20 <br /> Ethanol 158 100 100 158 55-200 48 20 QR-07 <br /> Ethylbenzene 538 0 50 5 00 108 89-122 3 20 <br /> Ethyl ten-butyl ether 523 1 0 500 105 71-120 9 20 <br /> Methyl tert-butyl ether 539 050 5 00 108 70-122 8 20 <br /> Toluene 5 16 050 500 103 84-119 4 20 <br /> Xylenes(total) 162 050 15 0 108 86-132 3 20 <br /> Surrogate Drbromofluoromethane 442 4 50 98 84-122 <br /> *urrogate 12-Drchloroethane-d4 428 4 50 95 74-135 <br /> Surrogate Toluene-d8 4 61 4 50 102 84-119 <br /> Batch 4020192-EPA 5030B waters <br /> Blank(4020192-BLKI) Prepared&Analyzed 02/09/04 <br /> Tert-amyl methyl ether ND 1 0 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 427 4 50 95 84-122 <br /> Surrogate 12-Drchloroethane-d4 4 10 4 50 91 74-135 <br /> Surrogate Toluene-d8 4 54 4 50 101 84-119 <br /> Sequoia Analytical 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 12 of 14 <br />