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IA55 McDowell Blvd, Ste D <br /> Sequoia Petaluma, <br /> CA CA 94954 <br /> Analytical (707)792-1865 <br /> FAX equoi labs ca42qW m www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site I 1194,Tracy,Ca P308015 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/03 17 10 <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 3080058-EPA 5030 waters <br /> Matrix Spike(3080058-MSI) Source P307552-06 Prepared&Analyzed 08/05/03 <br /> Tert-amyl methyl ether 257 5 0 ug/l 25 0 ND 103 70-116 <br /> Benzene 23 1 2 5 25 0 2 5 82 81-118 <br /> Tert-butyl alcohol 552 100 500 25 105 62-142 <br /> Di-isopropyl ether 23 2 5 0 25 0 ND 93 71-121 <br /> 1,2-Dibromoethane(EDS) 21 8 2 5 25 0 ND 87 92-117 Q-LIM <br /> I,2-Dichloroethane 21 5 2 5 25 0 ND 86 79-126 <br /> Ethyl tert-butyl ether 24 7 5 0 25 0 ND 99 71-110 <br /> Methyl tert-butyl ether 101 2 5 25 0 80 84 77-123 <br /> Toluene 23 1 2 5 25 0 1 0 88 84-119 <br /> Surrogate Dt brom ofluorom ethane 441 450 98 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 480 450 107 74-135 <br /> Orrogate Toluene-d8 498 450 111 84-119 <br /> arrogate 4-Bromofluorobenzene 538 450 120 86-119 S-LIM <br /> Matrix Spike Dup(308.0058-MSD1) Source P307552-06 Prepared&Analyzed 08/05/03_ <br /> Tert-amyl methyl ether T 25 8 5 0 ug/l 25 0 ND 103 70-116- 04 20 ^ <br /> Benzene 23 9 2 5 25 0 2 5 86 81-118 3 20 <br /> Tert-butyl alcohol 548 t00 500 25 105 62-142 0 7 20 <br /> Di-isopropyl ether 22 8 5 0 25 0 ND 91 71-121 2 20 <br /> 1,2-Dibromoethane(EDB) 22 2 2 5 25 0 ND 89 92-117 2 20 Q-LIM <br /> 1,2-Diehloroethane 22 9 2 5 25 0 ND 92 79-126 6 20 <br /> Ethyl tert-butyl ether 24 0 5 0 25 0 ND 96 71-110 3 20 <br /> Methyl tert-butyl ether 100 2 5 25 0 80 80 77-123 1 20 <br /> Toluene 22 2 2 5 25 0 1 0 85 84-119 4 20 <br /> Surrogate Dibromofluoromethane 4 36 450 97 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 81 450 107 74-135 <br /> Surrogate Toluene-d8 5 03 4 50 112 84-119 <br /> Surrogate 4-Bromofluorohenzene 518 450 115 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 15 of 21 <br />