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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <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 Vemon P EIarth 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 Limit Notes <br /> Batch 3100778-EPA 5030 waters <br /> Laboratory Control Sample Dup(3100778-BSDI) Prepared&Analyzed I0/30/03 <br /> Tert-amyl methyl ether 524 10 ugll 500 105 70 116 3 20 <br /> Benzene 5 27 050 500 105 81-118 4 20 <br /> Tert-butyl alcohol 132 20 100 132 62-142 27 20 QR-02 <br /> Di isopropyl ether 5 84 10 500 117 71-12I 11 20 <br /> Ethanol 110 100 100 110 65-135 44 20 QR-02 <br /> Ethylbenzene 547 050 5 00 109 89-122 7 20 <br /> Ethyl tert-butyl ether 569 1 0 5 00 114 71-110 2 20 Q-29 <br /> Methyl tert-butyl ether 5 12 050 5 00 102 77-123 2 20 <br /> Toluene 542 050 500 108 84-119 3 20 <br /> Xylenes(total) 15 3 050 15 0 102 86-132 6 20 <br /> Surrogate Dibromofluoromethane 547 5 00 109 84-122 <br /> *arrogate 12-D+chloroethane-d4 556 „ 500 111 74-135 <br /> arrogate Toluene-d8 519 500 104 84-119 <br /> Batch 3100786-EPA 5030 waters <br /> Blank(3100786-BLKI) Prepared&Analyzed 10/30/03 <br /> Tett-amyl methyl ether ND 1 0 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl terl-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 676 600 113 84-122 <br /> Surrogate 12-Dtchloroethane-d4 617 600 104 74-135 <br /> Surrogate Toluene d8 607 6 00 101 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 10 of 14 <br />