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n Jarvis DriveSequoia tvtorgaHill CA 95037 <br /> (408)776 9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs coin <br /> URS Corporation[Arcot] Project ARCO 46100, Tracey,CA MOF0786 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 Y-0003 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/22/05 16 37 <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 5G12011 -EPA 5030E PIT/EPA 8260B <br /> Blank(5G 12011-BLK2) Prepared&Analyzed 07/12/05 <br /> Toluene ND 050 ug/I <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Surrogate 1 2-Drchloroethane-d4 245 250 98 60-135 <br /> Laboratory Control Sample(5G12011-BS1) Prepared&Analyzed 07/12/05 <br /> tert-Amyl methyl ether 101 0 50 ug/I 100 101 80-115 <br /> Benzene 1 1 5 0 50 100 115 65-115 <br /> tert Butyl alcohol 408 20 500 82 75-150 <br /> Di-isopropyl ether 104 050 100 104 75-125 <br /> l 2-Dibromoethane(EDB) 9 96 050 100 100 85-120 <br /> l 2-Drchloroethane 997 050 100 100 85 130 <br /> Qihanol 150 100 200 75 70 135 <br /> hyl cert-butyl ether 9 82 0 50 100 98 75 130 <br /> Ethylbenzene 11 6 0 50 100 116 75-135 <br /> Methyl tert-butyl ether 972 0 50 100 97 65-125 <br /> Toluene 110 050 too 110 85-120 <br /> Xylenes(total) 34 5 0 50 300 115 85-125 <br /> Surrogate 1 2-Drchloroethane-d4 221 250 88 60-135 <br /> Laboratory Control Sample(5G12011-BS2) Prepared&Analyzed 07/12/05 <br /> Benzene 604 0 50 ug/l 6 08 99 65-115 <br /> Ethylbenzene 879 050 7 84 112 75-135 <br /> Methyl tert-butyl ether 847 0 50 9 60 88 65-125 <br /> Toluene 359 0 50 329 109 85-120 <br /> Xylenes(total) 42 6 050 385 11 1 85-125 <br /> Gasoline Range Organics(C4-C 12) 472 50 440 107 70-124 <br /> Surrogate 1 2-Drchloroethane-d4 246 250 98 60-135 <br /> Sequoia Analytical-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 14 of 17 <br />