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.x <br /> a— ) <br /> Sequoia 1455 McDow Pe Petaluma,CA 949i Blvd North Sic54 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792.0342 <br /> . www sequolalabs corn <br /> URS Cote-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 %RBC RPD <br /> Analyte Pcsult Limit Units Level Result %REC Limits RPD Lunu Notes <br /> Batch 4020167-EPA 5030B waters <br /> Blank(4020167-BLK1) Prepared&Analyzed 02/06/04 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Dr-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl terl-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 590 600 98 84-122 <br /> urrogate 12-Drchloroethane-d4 603 600 100 74-135 <br /> urrogate Toluene-d8 601 600 100 84-119 <br /> Laboratory Control Sample(4020167-BSI) Prepared&Analyzed 02/06/04 <br /> Tert-amyl methyl ether 494 10 ug/l 500 99 78-117 <br /> Benzene 486 050 500 97 81-118 <br /> Tert-butyl alcohol 124 20 100 124 60-147 <br /> Di-isopropyl ether 492 10 500 98 70-125 <br /> Ethanol 301 100 100 301 55-200 Q-29 <br /> Ethylbenzene 498 050 500 100 89 122 <br /> Ethyl tert-butyl ether 483 10 500 97 71 120 <br /> Methyl tert-butyl ether 5 15 050 500 103 70-122 <br /> Toluene 440 050 500 88 84-119 <br /> Xylenes(total) 151 050 ]so 101 86-132 <br /> Surrogate Dibromofluoromethane 597 600 100 84-121 <br /> Surrogate 12-Drchloroethane-d4 604 600 101 74-135 <br /> Surrogate Toluene-d8 588 600 98 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 />