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Y !'err ' 1455 McDowell Blvd CA Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707)7920342 <br /> www sequoialabs corn <br /> • <br /> URS Corp-Sacramento Projecl BP Heritage Site 11191,Stockton,Ca P307259 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/28/03 18 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 Notes <br /> Batch 3070391 -EPA 5030 waters <br /> Blank(3070391-BLK1) Prepared&Analyzed 07/18/03 <br /> Benzene ND 050 ug/l <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 583 600 97 84-122 <br /> Surrogate 12-Dichloroethane d4 4 95 600 82 74-135 <br /> Surrogate Toluene-d8 602 600 100 84-119 <br /> Laboratory Control Sample(3070391-BSI) Prepared&Analyzed 07/18/03 <br /> Tert amyl methyl ether 469 1 0 ug/l 500 94 70-116 <br /> enzene 494 050 500 99 81-118 <br /> ert butyl alcohol 160 20 100 160 62-142 Q-LIM <br /> Di-isopropyl ether 424 10 500 85 71-121 <br /> Ethyl tert butyl ether 432 1 0 500 86 71-110 <br /> Methyl tert-butyl ether 435 050 5 00 87 77-123 <br /> Toluene 4 82 050 5 00 96 84-119 <br /> Surrogate Dibromofluoromethane 549 600 92 84-122 <br /> Surrogate 12-Dichloroethane-d4 531 600 88 74-135 <br /> Surrogate Toluene-d8 618 600 103 84-119 <br /> Matrix Spike(3070391-MS1) Source P307158-06 Prepared&Analyzed 07/18/03 <br /> Teri-amyl methyl ether 488 100 ug/I 500 ND 98 70-116 <br /> Benzene 507 50 500 26 96 81-118 <br /> Tert butyl alcohol 9380 2000 10000 ND 94 62-142 <br /> Di-isopropyl ether 431 100 500 ND 86 71-121 <br /> Ethyl Cert-butyl ether 433 100 500 ND 87 71-110 <br /> Methyl tert butyl ether 462 50 500 89 75 77-123 Q-LTM <br /> Toluene 529 50 500 77 90 84-119 <br /> Surrogate DibromoJluoromethane 552 6 00 92 84-122 <br /> Surrogate 12-Dichloroethane-d4 531 600 88 74-135 <br /> Surrogate Toluene-d8 641 600 107 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 9 of 11 <br />