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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> �� Analytical (707)792 1865 <br /> FAX(707)792 0342 <br /> www sequotalabs corn <br /> URS Corp-Sacramento Protect BP Heritage Site 11194,Tracy,Ca P502088 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Jeff Brooks 02/16/05 16 54 <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 5020202-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5020202-MSI) Source P502088-01 Prepared&Analyzed 02/14/05 <br /> Tert-amyl methyl ether —478 10 ug/l 500 ND 96 78-117 <br /> Benzene 430 050 500 ND 86 81-118 <br /> Teri-butyl alcohol 935 20 100 ND 94 60-147 <br /> Di-isopropyl ether 450 10 500 ND 90 70-125 <br /> Ethanol 759 100 100 ND 76 55-200 <br /> Ethylbetizene 489 050 500 ND 98 89-122 <br /> Ethyl tert-butyl ether 464 10 500 ND 93 71-120 <br /> Methyl tert-butyl ether 283 050 500 24 86 70-122 <br /> Toluene 452 050 Soo ND 90 84-119 <br /> Xylenes(total) 141 050 150 ND 94 86-132 <br /> Surrogate Dibromofluoromethane 542 500 108 84-111 <br /> 0Surrogate 1,2-Dichloroethane-d4 527 500 105 74-135 <br /> -ragate Toluene-d8 S06 So0 101 84-119 <br /> urrogate 4-Bromofluorobenzene 510 500 104 86-119 <br /> Matrix Spike Dup(5020202-MSD]) Source P502088-01 Prepared&Analyzed 02/14/05 <br /> Tert-amyl methyl ether 539 10 ug/! 500 ND 108 78-117 12 20 <br /> Benzene 465 050 500 ND 93 81-118 8 20 <br /> Tert-butyl alcohol 102 20 100 ND 102 60-147 9 20 <br /> Di-isopropyl ether 4 85 10 500 ND 97 70-125 7 20 <br /> Ethanol 906 100 I00 ND 9I 55-200 18 20 <br /> Ethylbenzene 5 07 050 500 ND 101 89-122 4 20 <br /> Ethyl tert-butyl ether 504 10 500 ND 101 71-120 8 20 <br /> Methyl ter(-butyl ether 292 050 500 24 104 70-122 3 20 <br /> Toluene 501 050 5 00 ND 100 84-119 10 20 <br /> Xylenes(total) 149 050 150 ND 99 86 132 6 20 <br /> Surrogate Dibromofluoromethane 511 500 104 84-121 <br /> Surrogate 1 2-Dichloroethane44 522 Soo 104 74-135 <br /> Surrogate Toluene-d8 514 500 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 514 500 103 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 /> • This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />