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.t <br /> lvd,North Ste <br /> (D Sequoia 1455 McDowell luma,CA 94954 <br /> Analytical (707)792- <br /> FAX(707)792-01865 342342 <br /> www sequoialabs eom <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P401434 <br /> 2870 Gateway Oaks Drive 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 Rewlt Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020169-EPA 5030B waters <br /> Blank(4020169-BLK1) Prepared&Analyzed 02/07/04 <br /> Ten amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol 335 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tort-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 443 " 450 98 84-122 <br /> urrogate 12-Dtehloroethane-d4 438 450 97 74-135 <br /> Surrogate Toluene-d8 446 450 99 84-119 <br /> Laboratory Control Sample(4020169-BSI) Prepared&Analyzed 02/07/04 <br /> Tert-amyl methyl ether 479 10 ug/l. 500 96 78-117 <br /> Benzene 5 14 050 500 103 81-118 <br /> Teri-butyl alcohol 109 20 100 109 60-147 <br /> Di-isopropyl ether 543 to 500 109 70-125 <br /> Ethanol 259 100 100 259 55-200 Q-29 <br /> Ethylbenzene 520 050 500 104 89-122 <br /> Ethyl ten-butyl ether 479 10 500 96 71-120 <br /> Methyl tert-butyl ether 497 050 500 99 70-122 <br /> Toluene 494 050 500 99 84-119 <br /> Xylenes(total) 157 050 150 105 86-132 <br /> Surrogate Dibromofluoromethane 434 450 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 417 450 93 74-135 <br /> Surrogate Toluene-d8 461 450 102 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 11 of 14 <br />