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CD Seq 885 Jarvis Dave <br /> u�la Morgan Hill CA 95037 <br /> Analytical FAX(408 408)776-6608 <br /> 782-6308 <br /> www sequoialabs cam <br /> URS Corporation [Arco I Project ARCO 46100,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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6AO4010- EPA 5030B PIT/EPA 82608 <br /> Matrix Spike Dup(6A04010-MSDI) Source MOL0908-01 Prepared&Analyzed 01/04/06 <br /> tert-Amyl methyl ether 1320 50 ug,9 1500 ND 88 80-115 4 15 <br /> Benzene 3720 50 516 3200 10] 65-115 10 20 <br /> tert-Butyl alcohol 16600 2000 14300 ND 116 75-120 16 25 <br /> Di-isopropyl ether 1230 50 1510 ND 81 75-125 14 15 <br /> 1,2-Dibromoethane(EDB) 1810 50 1490 ND 121 85-120 12 15 LM <br /> 12-Dichloroethane 1470 50 1470 ND 100 85-130 7 20 <br /> Ethanol 19100 10000 14200 ND 135 70-135 9 35 IC <br /> Ethyl tert-butyl ether 1280 50 1500 ND 85 75-130 11 25 <br /> Ethylbenzene 1200 50 754 380 109 75-135 24 15 BA <br /> Methyl tert-butyl ether 777 50 702 270 72 65-125 16 20 <br /> Toluene 4050 50 3720 47 108 85-120 11 20 <br /> Aees(total) 4910 50 4120 830 99 85-125 22 20 BA <br /> Wine Range Organics(C4-C12) 44300 5000 44000 10000 78 60-140 1 25 <br /> Surrogate 12-Dichloroethane-d4 2 16 250 86 60-135 <br /> �uola Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 18 of 19 <br />