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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1965 <br /> a— )W Analytical FAX(707)792-0342 <br /> 0 www sequoialabs 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 ElWh 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 Limit Units Level Result "/.REC Limits RPD Limit Notes <br /> Batch 4050290-EPA 5030B waters <br /> Matrix Spike(4050290-MSI) Source P405003-03 Prepared&Analyzed 05/12/04 <br /> Tert-amyl methyl ether 281 50 ug/1 250 25 102 78-117 <br /> Benzene 247 2 5 25 0 027 98 81-118 <br /> Tert-butyl alcohol 776 100 500 240 107 60-147 <br /> Di-isopropyl ether 25 1 5 0 25 0 ND 100 70-125 <br /> Ethanol 540 500 500 ND 108 55-200 <br /> Ethylbenzene 26 1 2 5 250 ND 104 89-122 <br /> Ethyl tert-butyl ether 24 4 50 250 ND 98 71-120 <br /> Methyl tert-butyl ether 181 2 5 250 160 84 70-122 <br /> Toluene 24 1 2 5 250 ND 96 84-119 <br /> Xylenes(total) 776 2 5 75 0 ND 103 86-132 <br /> Surrogate Drbromofluoromethane .562 6 00 94 84-122 <br /> Allh�urrogate 1 2-Drchloroethane-d4 5 77 600 96 74-135 <br /> IIIWurrogafe Toluene-d8 599 6 00 100 84-119 <br /> Matrix Spike Dup(4050290-MSDI) Source P405003-03 Prepared&Analyzed 05/12/04 <br /> Tert-amyl methyl ether 279 5 0 ug/l 250 25 101 78-117 0 7 20 <br /> Benzene 24 3 2 5 25 0 027 96 81-118 2 20 <br /> Tert-butyl alcohol 822 100 500 240 116 60-147 6 20 <br /> Di-isopropyl ether 246 5 0 250 ND 98 70-125 2 20 <br /> Ethanol 694 500 500 ND 139 55-200 25 20 QC20 <br /> Ethylbenzene 248 2 5 250 ND 99 89-122 5 20 <br /> Ethyl tert-butyl ether 242 so 250 ND 97 71-120 08 20 <br /> Methyi tert-butyl ether 183 25 250 160 92 70-122 1 20 <br /> Toluene 23 3 2 5 250 ND 93 84-119 3 20 <br /> Xylenes(total) 767 25 750 ND 102 86-132 1 20 <br /> Surrogate Dibromofluoromethane 366 600 94 84-122 <br /> Surrogate 1 2-Dichloroeihane-d4 600 600 100 74-135 <br /> Surrogate Toluene-d8 .589 6 00 98 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 /> 0 This analytical report must be reproduced in its entirety <br /> Page 20 of 21 <br />