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{ <br /> Sequoia 885 Jarvis Drive <br /> ��".�',� Morgan Hill,CA 95037 <br /> FAnalytics[ FAX(408)776-9604 <br /> (408)782-6308 <br /> www.sequoialabs.com <br /> F <br /> URS Corporation[Arcola Project:ARCO#2168,Stockton,CA MOK0608 <br /> F, 2870 Gateway Oaks Dr.,Ste 300 Project Nutnber:GOC81-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 11/28/05 15:08 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> F' Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> FBatch 5K22027-EPA 5030B/5035A McOH/EPA 8260B <br /> Laboratory Control Sample Dup(SK22027-BSD1) Prepared: 11/22/05 Analyzed: 11/23/05 <br /> tert-Amyl methyl ether 0.566 0.025 mg/kg 0.564 100 80-130 1 25 <br /> Benzene 0.176 0.050 0.194 91 65-125 0.6 20 <br /> tert-Butyl alcohol 7.13 5.0 5.37 133 80-165 9 25 <br /> Di-isopropyl ether 0.525 0.025 0.567 93 85-115 0.2 20 <br /> 1,2-Dibromoethane(EDB) 0.636 0.025 0.558 114 85-130 3 15 <br /> 1,2-Dichloroethane 0.601 0.025 0.552 109 63-1244 0.7 25 <br /> Ethanol 5.67 10 5.31 107 35-150' 1 40 <br /> Ethyl Cert-butyl ether 0.541 0.025 " 0,564 96 80-125 0.7 25 <br /> F Ethylbenzene 0.255 0.050 0.283 <br /> 90 80-135 5 20 <br /> Methyl tert-butyl ether 0.267 0.025 0.263 102 75-115 1 35 <br /> Toluene 1.32 0.050 1.39 95 85-125 0 15 <br /> Xylenes(total) 1.48 0.050 1.55 95 80-140 1 20 <br /> FI' <br /> Gasoline Range Organics(C4-C 12) 15.2 2.5 16.592 60-140 0.7 25 <br /> Surrogate:1,2-Dichloroethane-d4 0.00597 0.00500 119 60-115 ' <br /> F <br /> F <br /> I <br /> r I <br /> I <br /> F 1 <br /> i <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 8 of 9 <br /> E <br /> t <br />