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1885 Jarvis 07 <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical (409)782 6309 <br /> FAX 408 7 <br /> www sequotalabs com i <br /> URS Corporation[Arcoll Project ARCO#5469,Stockton CA MOF0335 <br /> 2870 Gateway Oaks Dr,Ste 300 Protect Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/23/05 15 34 <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 5F16006- EPA 5030B P/T/EPA 8260B <br /> Blank(5F16006-BLK2) Prepared 06/16/05 Analyzed 06/17/05 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 50 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> �[enes(total) ND 050 11 <br /> so]ine Range Organics(C4-C12) ND 50 <br /> Surrogate 12-Dichloroethane-d4 4 77 500 95 60-135 <br /> Laboratory Control Sample(5F16006-BSI) Prepared&Analyzed 06/16/05 <br /> tcrt-Amyl methyl ether 107 050 u8/l 100 107 80-115 <br /> Benzene 9 91 050 100 99 65 115 <br /> tert-Butyl alcohol 506 5 0 500 101 75-150 <br /> Di-isopropyl ether 104 050 too 104 75-125 <br /> 1 2-Dibromoethane(EBB) 881 0 50 too 88 85-120 <br /> 1,2-Dichloroethane 906 0 50 100 91 85-130 <br /> Ethanol 176 100 200 88 70-135 <br /> Ethyl tert-butyl ether 990 0 50 100 99 75-130 <br /> Ethylbenzene 942 050 100 94 75-135 <br /> Methyl ten-butyl ether 932 050 too 93 65-125 <br /> Toluene 986 050 100 99 85-120 <br /> Xylenes(total) 31 3 050 300 104 85-125 <br /> Surrogate 12-Dichloroethane-d4 406 500 81 60-135 <br /> Sequoia Analytical-Morgan Hili 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 15 of 20 <br />