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1455 McDowell Blvd,North Ste D <br /> 4DSequoia Petaluma,CA 94954 <br /> (747)792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> WWW sequoialabs coni <br /> is <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P411027 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Jeff Brooks 12/06/04 15 39 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result lama Units Level Result °/uREC Limits RPD Limit Notes <br /> Batch 4110095-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(4110095-MSI) Source P411025-01 Prepared&Analyzed 11/03/04 <br /> Tert-amyl methyl ether 133 25 ugll 125 ND 106 78-117 <br /> Benzene 125 12 125 ND 100 81-118 <br /> Tert-butyl alcohol 2050 500 2500 ND 82 60-147 <br /> Dtasopropylether 122 25 125 ND 98 70-125 <br /> Ethanol 2400 2500 2500 ND 96 55-200 <br /> Ethylbenzene 119 12 125 ND 95 89-122 <br /> Ethyl tent-butyl ether 128 25 125 ND 102 71-120 <br /> Methyl tert-butyl ether 769 12 125 630 111 70-122 <br /> Toluene 120 12 " 125 ND 96 84-119 <br /> Xylenes(total) 362 12 375 ND 97 86-132 <br /> Surrogate Dybromofluoromethane 547 500 109 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 547 500 109 74-135 <br /> *arrogate Toluene-d8 593 H Soo 119 84-119 <br /> Surrogate 4-Bromofluorobenzene 500 500 100 86-119 <br /> Matrix Spike Dnp(4110095-MSDI) Source P411025-01 Prepared&Analyzed 11/03/04 <br /> Tert-amyl methyl ether 126 25 ug/l 125 ND 101 78-117 5 20 <br /> Benzene 116 12 125 ND 93 81-118 7 20 <br /> Tert-butyl alcohol 1950 500 2500 ND 78 60-147 5 20 <br /> Di-isopropyl ether 115 25 125 ND 92 70-125 6 20 <br /> Ethanol 2550 2500 2500 ND 102 55-200 6 20 <br /> Ethylbenzene 109 12 125 ND 87 89-122 9 20 LN <br /> Ethyl tert-butyl ether 121 25 125 ND 97 71-120 6 20 <br /> Methyl tert-butyl ether 742 12 125 630 90 70-122 4 20 <br /> Toluene 113 12 125 ND 90 84-119 6 20 <br /> Xylenes(total) 333 12 375 ND 89 86-132 8 20 <br /> Surrogate Dibromofluoromethane 549 500 110 84-122 <br /> Surrogate 1,2-Dichloroethane-l4 534 500 107 74-135 <br /> Surrogate Toluene-d8 5 83 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 508 " 500 102 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 /> 0 This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />