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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> 0 www sequoialabs coin <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 Vernon P Elarth 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 3100786-EPA 5030 waters <br /> Matrix Spike Dup(3100786-MSD1) Source P310487-03 Prepared&Analyzed 10/30/03 <br /> Teri amyl methyl ether 498 10 ugll 500 ND 100 70-116 06 20 <br /> Benzene 5 12 050 5 00 ND 102 81-118 0 2 20 <br /> Tert-butyl alcohol 111 20 100 ND 111 62-142 3 20 <br /> Dr-isopropyl ether 5 15 10 5 00 ND 103 71-121 06 20 <br /> Ethanol 124 100 I00 ND 124 65-135 32 20 QR-02 <br /> Ethylbenzene 559 050 500 ND 112 89-122 0 20 <br /> Ethyl tert-butyl ether 5 12 1 0 500 ND 102 71-110 2 20 <br /> Methyl tert-butyl ether 474 050 500 ND 95 77-123 06 20 <br /> Toluene 476 050 500 ND 95 84-119 0 20 <br /> Xylenes(total) 160 050 ]so ND 107 86-132 0 20 <br /> Surrogate Dibromofluoromethane 722 600 120 84-122 <br /> 0rrogate 1 2-Dichloroethane d4 676 600 113 74-135 <br /> urrogate Toluene-d8 625 600 104 84-119 <br /> Batch 3100829-EPA 5030 waters <br /> Blank(3100829-BLKI) Prepared&Analyzed 10/31/03 <br /> Tert amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Tert butyl alcohol ND 20 " <br /> Dt-isopropyl ether ND 10 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate DibromoJluoromethane 536 500 107 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 592 500 118 74-135 <br /> Surrogate Toluene-d8 494 500 99 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 entirely <br /> Page 12 of 14 <br />