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^Y* 1455 McDow <br /> Sequoia Petaell Blvd,North Ste <br /> luma,CA 449544 <br /> 4 <br /> Analytical (707)792-0342 <br /> 092-1865 <br /> FAX equ 7 <br /> www sequoiaEabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P401433 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/11/04 16 31 <br /> Volatile Organic Compounds by EPA Method 8260B- Quahty Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPA Limit Notes <br /> Batch 4020167-EPA 5030B waters <br /> Matrix Spike Dup(4020167-MSD1) Source P401433-12 Prepared 02/06/04 Analyzed 02/07/04 <br /> Teri-amyl methyl ether 95 8 20 ug/l 100 ND 96 78-117 1 20 <br /> Benzene 103 10 100 10 93 81-118 5 20 <br /> Tert-butyl alcohol 2730 400 2000 ND 136 60-147 27 20 QR-02 <br /> Di-isopropyl ether 959 20 100 ND 96 70-125 2 20 <br /> Ethanol 3140 2000 2000 ND 157 55-200 73 20 QR-02 <br /> Ethylbenzene 131 10 100 35 96 89-122 4 20 <br /> Ethyl tent-butyl ether 92 7 20 100 ND 93 71-120 02 20 <br /> Methyl tert-butyl ether 102 10 100 3 6 98 70-122 4 20 <br /> Toluene 87 8 10 100 2 0 86 84-119 5 20 <br /> Xylenes(total) 299 10 300 ND 100 86-132 5 20 <br /> Surrogate Dibromofluoromethane 6 12 600 102 84-122 <br /> Ourrogate 12-Dichloroethane-d4 601 600 100 74-135 <br /> rrogate Toluene-d8 5 95 600 99 84-119 <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 17 of 18 <br />