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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865865 <br /> Analytical FAX 792-0 <br /> www seqquot uoialabs com <br /> UR=GatewayOaks <br /> Project BP Heritage Site 11191,Stockton,Ca P404678 <br /> 12870ve Suite 300 Project Number WR36368 Reported <br /> SacProject Manager Vernon P Elarth 05/27/04 15 02 <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 4050236-EPA 5030B waters <br /> Blank(4050236-BLK1) Prepared&Analyzed 05/11/04 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 587 600 98 84-122 <br /> Surrogate 1,1-Dichloroethane-d4 613 600 102 74-135 <br /> lrrogare Toluene-d8 6 09 600 102 84-119 <br /> aboratory Control Sample(4050236-'BSS) Prepared&Analyzed 05/11/04 <br /> Teri amyl methyl ether 5 10 10 ug/l 500 102 78-117 <br /> Benzene 503 050 500 101 81-118 <br /> Teri-butyl alcohol 130 20 100 130 60-147 <br /> Di-isopropyl ether 548 10 Soo l 10 70-125 <br /> Ethanol 195 100 t00 195 55-200 <br /> Ethylbenzene 529 050 500 106 89-122 <br /> Ethyl tert-butyl ether 5 17 10 5 00 103 71-120 <br /> Methyl tert-butyl ether 5 11 050 5 00 102 70-122 <br /> Toluene 4 68 0 50 500 94 84-119 <br /> Xylenes(total) 160 050 15 0 107 86-132 <br /> Surrogate Drbromofluoromethane 5 87 600 98 84-122 <br /> Surrogate 12 Dichloroethane-d4 615 600 102 74-135 <br /> Surrogate Toluene-d8 5 89 600 98 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance wish 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 />