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1455 McDowell Blvd,North Ste D <br /> r i1 <br /> { Sequoia Petaluma,C94954 <br /> ''►ri (707)799 2-1665 <br /> Analytical <br /> FAXs"oi labsco2 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P404678 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project 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 Dotes <br /> Batch 4050236-EPA 5030B waters <br /> Laboratory Control Sample Dup(4050236-BSDI) Prepared&Analyzed 05/11/04 <br /> Tert-amyl methyl ether 531 10 ug/I 500 106 78-117 4 20 <br /> Benzene 527 050 500 105 81-118 5 20 <br /> Tert-butyl alcohol 112 20 100 112 60-147 15 20 <br /> Di-isopropyl ether 587 10 500 117 70-125 7 20 <br /> Ethanol 114 100 100 114 55 200 52 20 QC20 <br /> Ethylbenzene 525 050 500 105 89-122 08 20 <br /> Ethyl tert-butyl ether 557 to 500 111 71-120 7 20 <br /> Methyl tert-butyl ether 554 050 500 1 1 1 70-122 8 20 <br /> Toluene 480 050 500 96 84-119 3 20 <br /> Xylenes(total) 159 050 150 106 86 132 06 20 <br /> Surrogate Dibromofluaromethane 605 600 101 84-122 <br /> Surrogate 1 2-Dichloroethane d4 632 600 105 74-135 <br /> ogate Toluene-d8 601 600 100 84-119 <br /> atch 4050263-EPA 5030B waters <br /> Blank(4050263-BLKI) Prepared&Analyzed 05/11/04 <br /> Tert-amyl methyl ether ND 10 ug/1 <br /> Benzene ND 050 " <br /> Teri-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl Cert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 4 89 500 98 84-122 <br /> Surrogate 12-Dichloroethane-d4 503 500 101 74-135 <br /> Surrogate Toluene-d8 5 03 500 101 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 staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 11 of 14 <br />