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�l <br /> a— ) t4551vIcDowell aNorth Ste <br /> Sequoia Petaluma, <br /> a,CA 949544 <br /> 4 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-6342 <br /> . www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P310466 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 16 09 <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 %RFC Limits RPD Limit Notes <br /> Batch 3100786-EPA 5030 waters <br /> Laboratory Control Sample(3100786-BSI) Prepared&Analyzed 10/30/03 <br /> Tert-amyl methyl ether 5 12 10 ug/I 500 IO2 70-116 <br /> Benzene 530 050 500 106 81-118 <br /> Teri-butyl alcohol 116 20 100 116 62-142 <br /> Di-isopropyl ether 5 25 10 5 00 105 71-121 <br /> Ethanol 220 100 100 220 65-135 Q-29 <br /> Ethylbenzene 562 050 500 112 89-122 <br /> Ethyl Cert-butyl ether 5 18 1 0 500 104 71-110 <br /> Methyl tert butyl ether 482 0 50 5 00 96 77-123 <br /> Toluene 5 14 0 50 5 00 103 84-119 <br /> Xylenes(total) 16 7 050 150 111 86-132 <br /> Surrogate Dibromofluoromethane 707 " 600 118 84-121 <br /> rrrogate 12-Dichloroethane-d4 651 I' 600 108 74-135 <br /> urrogate Toluene-d8 633 600 106 84-119 <br /> Matrix Spike(3100786-MSI) Source P310487-03 Prepared&Analyzed 10/30/03 <br /> Tett-amyl methyl ether 4 95 10 ug/I 500 ND 99 70-116 <br /> Benzene 5 1 1 050 500 ND 102 81-118 <br /> Ter-butyl alcohol 108 20 100 ND 108 62-142 <br /> Di-isopropyl ether 5 12 10 500 ND 102 71-121 <br /> Ethanol 899 100 100 ND 90 65-135 <br /> Ethylbenzene 559 050 5 00 ND 112 89-122 <br /> Ethyl tert-butyl ether 504 10 500 ND 101 71-110 <br /> Methyl tert-butyl ether 4 71 050 5 00 ND 94 77-123 <br /> Toluene 476 050 500 ND 95 84-119 <br /> Xylenes(total) 160 050 150 ND 107 86-132 <br /> Surrogate Dibromofluoromethane 737 6 00 113 84-122 S-LIM <br /> Surrogate 1 1-Dichloroethane-d4 646 6 00 108 74-135 <br /> Surrogate Toluene-d8 610 600 102 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 /> This analytical report must be reproduced in its entirety <br /> Page 11 of 14 <br />