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665 JarvisDrive <br /> Sequoia Morgan H.11,CA 950375037 <br /> Analytical FAx <br /> 1a) (408)772.9600 <br /> (408)782-e306 <br /> www sequoialabs corn <br /> URS Corporation[Arcoll Project BP Heritage#11194,Tracy,CA MOE0217 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WZ-0011 Reported <br /> Sacramento CA,95833 Project Manager,teff Brooks 05/19/05 16 42 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5E13005-EPA 5030B PIT I EPA 8260B <br /> Blank(5E13005-BLK1) Prepared&Analyzed 05/13/05 <br /> tert-Amyl methyl ether ND 050 ugfl <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 5 0 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 485 500 97 60-1.35 <br /> Laboratory Control Sample(5E13005-BSI) Prepared&Analyzed 05/13/05 <br /> tert-Amyl methyl ether 974 050 ugll 100 97 80-115 <br /> Benzene 903 050 100 90 65-115 <br /> tert-Butyl alcohol 49 8 20 500 100 75-150 <br /> Dr-isopropyl ether 990 050 100 99 75-125 <br /> Ethanol 139 100 200 70 70-135 <br /> Ethyl tert-butyl ether 991 050 100 99 75-130 <br /> Ethylbenzene 953 050 100 95 75-135 <br /> Methyl tert-butyl ether 102 050 100 102 65-125 <br /> Toluene 966 050 100 97 85-120 <br /> Xylenes(total) 294 050 300 98 85-125 <br /> Surrogate 11-Dtchloroelhane-d4 489 500 98 60-135 <br /> Laboratory Control Sample(5E13005-BS2) Prepared&Analyzed 05/13/05 <br /> Benzene 5 07 0 50 ug/l 608 83 65-115 <br /> Ethylbenzene 769 050 784 98 75-135 <br /> Methyl tent-butyl ether 964 050 960 100 65-125 <br /> Toluene 341 050 32 9 104 85-120 <br /> Xylenes(total) 388 050 38 5 101 85-125 <br /> Gasoline Range Organics(C4-Cl2) 411 50 440 93 70-124 <br /> Surrogate 11-Dichloroethane-d4 S34 500 107 60-135 <br /> Sequoia Analyttcal-Morgan Hill 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 8 of 10 <br />