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6) Sequoia 885 Jarvis drive <br /> Morgan Hill CA 95037 <br /> 6) Analytical FAX(408408)78822 6 633 700 <br /> 08 <br /> www sequoialabs coin <br /> URS Corporation [Arco]a Project ARCO#6100,Tracey,CA MOL0796 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOC 1 Y-0005 Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 01/16/06 16 27 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %P-FC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6A04010- EPA 5030B PIT/EPA $260B <br /> Blank(6A04010-BLK2) Prepared&Analyzed 01/04/06 <br /> tert-Amyl methyl ether ND 050 ug/1 <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0 50 " <br /> 2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 IC <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Cnes(total) ND 050 <br /> " <br /> C. Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 204 250 82 60-135 <br /> Laboratory Control Sample(6A04010-BSI) Prepared&Analyzed 01/04/06 <br /> tert-Amyl methyl ether 14 2 0 50 ug/1 150 95 80-115 <br /> Benzene 451 050 5 16 87 65-115 <br /> tert-Butyl alcohol 166 20 143 116 75-150 <br /> Di-isopropyl ether 15 0 0 50 151 99 75-125 <br /> 1 2-Dibromoethane(EDB) 166 050 14 9 111 85-120 <br /> 1,2-Dichloroethane 156 0 50 14 7 106 85-130 <br /> Ethanol 394 100 142 277 70-135 HI„IC <br /> Ethyl tert-butyl ether 14 2 050 15 0 95 75-130 <br /> Ethylbenzene 801 0 50 754 106 75-135 <br /> Methyl tert-butyl ether 5 15 050 702 73 65-125 <br /> Toluene 384 050 372 103 85-120 <br /> Xylenes(total) 406 0 50 41 2 99 85-125 <br /> Gasoline Range Organics(C4-C12) 324 50 440 74 60-140 <br /> Surrogate 1 2-Dtchloroelhane-d4 217 250 87 60-135 <br /> o <br /> uola Analytical- Morgan H111 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 16 of 19 <br />