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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical www 7)792-0342 <br /> w scquequotalabs coin <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P501283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/27/05 08 37 <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 °/oREC Limits RPD limit Notes <br /> Batch 5010267-EPA 5030B waters/EPA 8260E <br /> Blank(5010267-BLKI) Prepared&Analyzed 01/25/05 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 050 " <br /> Tort-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 /> I <br /> Surrogate Dibromofluoromethane 4 76 500 95 84-122 <br /> Surrogate 1,2 Drchloroethane-d4 515 500 103 74-135 <br /> Surrogate Toluene-d8 472 500 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 472 500 94 86-119 <br /> Laboratory Control Sample(5010267-BSI) Prepared&Analyzed 01/25/05 <br /> Tert-amyl methyl ether 586 1 0 ug/I 500 117 78-117 <br /> Benzene 532 050 500 106 81 118 <br /> Tert-butyl alcohol 965 20 100 96 60-147 <br /> Di-isopropyl ether 5 53 1 0 500 111 70-125 <br /> Ethanol 93 5 100 100 94 55-200 <br /> Ethylbenzene 521 050 500 104 89 122 <br /> Ethyl ted-butyl ether 526 1 0 500 105 71-120 <br /> Methyl tert-butyl ether 557 050 500 111 70-122 <br /> Toluene 5 35 050 Soo 107 84-119 <br /> Xylenes(total) 161 050 150 107 86-132 <br /> Surrogate Dibromofluoromethane 496 500 99 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 -536 5 00 107 74-135 <br /> Surrogate Toluene-d8 497 500 99 84-119 <br /> Surrogate 4-Bromofluorobenzene 480 500 96 86-119 <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 12 <br />