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1885 Jarvis Drive <br /> 4D— Sequoia Morgan Hill CA 95037 i <br /> � Analytical (408)776-9300 <br /> FAX(408)782-6308 <br /> www sequotalabs corn <br /> URS Corporatton(Arco II Project BP Heritage#11191,Stockton,CA MOG0813 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WW-0016 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/05/05 14 59 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Luuit units Level Result %REC Lands RPD Liirut Notes <br /> Batch 5G28004-EPA 5030B PIT/EPA 8260B <br /> Blank(5G28004-BLKI) Prepared&Analyzed 07/28/05 <br /> Cert-Amyl methyl ether ND 050 4911 <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <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-Cl2) ND 50 " <br /> W'Zogate 12-Dichloroethane d4 131 2 50 92 60-135 <br /> nk(5G28004-BLK2) Prepared&Analyzed 07/28/05 <br /> tert Amy]methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 <br /> Ethanol ND 100 <br /> Ethyl tent-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl ten-bury]ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C4-Cl2) ND 50 " <br /> Surrogate 12-Dichloroethane-0 142 150 97 60-135 <br /> Laboratory Control Sample(SG28004-BSI) Prepared&Analyzed 07/28/05 <br /> tert-Amyl methyl ether 10 5 050 ug/l 100 105 80-115 <br /> Benzene 113 050 100 113 65-115 <br /> tert-Butyl alcohol 444 20 500 89 75-150 <br /> D,isopropyl ether 10 0 050 100 100 75-125 <br /> Ethanol 200 100 200 100 70-135 <br /> Ethyl tert-butyl ether 9 83 0 50 100 98 75-130 <br /> Ethylbenzene 927 050 100 93 75-135 <br /> Methyl tert-butyl ether 10 3 050 100 103 65-125 <br /> Sequoia Analytical-Morgan Hill 77te 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 7 of 12 <br />