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l Blvd,North Sc <br /> Sequoia 1455 McDowPetaluma,CA 4t94a— ) (707)792-1865 <br /> �► Analytical FAX(707)7920342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/25/04 13 28 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Irmrt Units Level Result °/oREC Limits RPD Limit Notes <br /> Batch 4050243-EPA 5030B waters <br /> Laboratory Control Sample Dup(4050243-BS01) Prepared 05/11/04 Analyzed 05/12/04 <br /> Tert-amyl methyl ether 499 10 ugA Soo 100 78-117 1 20 <br /> Benzene 560 050 Soo 112 81-118 4 20 <br /> Tert-butyl alcohol 123 20 100 123 60-147 10 20 <br /> Di-isopropyl ether 550 10 500 110 70-125 4 20 <br /> Ethanol 233 100 100 233 55-200 26 20 QC01 QC20 <br /> Ethylbenzene 5 15 050 500 103 89-122 8 20 <br /> Ethyl tert-butyl ether 535 10 500 107 71-120 02 20 <br /> Methyl tert-butyl ether 544 050 500 109 70-122 6 20 <br /> Toluene 547 050 500 109 84119 7 20 <br /> Xylenes(total) 161 050 150 107 86-132 7 20 <br /> Surrogate Dibromofluoromethane 467 430 104 84-122 <br /> AKurrogate 1 2-Dichloroethane-d4 484 „ 430 108 74-135 <br /> arrogate Toluene-d8 456 450 101 84-119 <br /> Batch 4050263-EPA 5030B waters <br /> Blank(4050263-BLKI) Prepared&Analyzed 05/11/04 <br /> Teri-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 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 489 500 98 84-122 <br /> Surrogate 12-Dichloroethane-d4 503 500 101 74-135 <br /> Surrogate Toluene-d8 503 Soo 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 wei weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 15 of 21 <br />