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- 1885 Jarvis <br /> Drive <br /> Sequoia Morgan Hill CACA 950375037 <br /> D- (408)776 9600 <br /> � ► Analytical FAX(408)782-6308 <br /> www sequoialabs cum <br /> URS Corporation[Arcot] Project ARCO#6100,Tracey,CA MOH0072 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOC 1 Y-0005 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 08/05/05 10 25 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source °/.REC RPD <br /> Analyte Result Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch SH03004- EPA 5030B PIT/EPA 8260B <br /> Blank(5H03004-BLKI) Prepared&Analyzed 08/03/05 <br /> tert-Amyl methyl ether ND 050 mg/m'Air <br /> Benzene ND 050 <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 0 50 " <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-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 261 250 104 60-135 <br /> aboratory Control Sample(5H03004-BSI) Prepared&Analyzed 08/03/05 <br /> rt-Amyl methyl ether 104 050 mg/m'Air 10 0 104 80-115 <br /> Benzene 106 050 10 0 106 65-115 <br /> tert-Butyl alcohol 48 2 20 500 96 75-150 <br /> Di-isopropyl ether 960 0 50 100 96 75-125 <br /> Ethyl ten-butyl ether 9 92 050 100 99 75-130 <br /> Ethylbenzene 8 99 050 100 90 75-135 <br /> Methyl cert-butyl ether 108 050 10 0 108 65-125 <br /> Toluene 10 8 050 )0 0 108 85-120 <br /> Xylenes(total) 266 050 300 89 85-125 <br /> Surrogate 12-Dtchloroethane-d4 243 250 97 60-135 <br /> Laboratory Control Sample(SH03004-BS2) Prepared&Analyzed 08/03/05 <br /> Benzene 576 050 mg/m'Air 6 08 95 65-115 <br /> Ethylbenzene 696 050 784 89 75-135 <br /> Methyl tert-butyl ether 8 87 0 50 960 92 65-125 <br /> Toluene 36 6 050 32 9 111 85-120 <br /> Xylenes(total) 34 2 050 38 5 89 85-125 <br /> Gasoline Range Organics(C4 C12) 455 50 440 103 70-124 <br /> Surrogate 1 2-Dtchloroethane-d4 236 250 94 60-135 <br /> Sequoia Analytical -Morgan Hill The results to 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 to its entirety <br /> Page 9 of 11 <br />