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Ft <br /> Sequoia 885 Jarvis Drive <br /> Morgan Hilt,CA 95037 <br /> Analytical (40a)776-9600 <br /> i FAX(408)782-6308 <br /> Fi <br /> www,sequoialabs.com <br /> URS Corporation[Arco/ <br /> 1 Project.ARCO#2168,Stockton,CA MOK0321 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Numbcr:GOC81-0010 <br />' Reported: <br /> Sacramento CA,95833 Project ManageraJernon P.Elarth <br /> 11/23/05 12:41 <br /> Volatile Organic Compounds by EPA Method 826013- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5K15030-EPA 503OB/5035A McOH/EPA 8260B <br /> Laboratory Control Sample Dup(5K15030-BSDI) Prepared: 11/15/05 Analyzed: 11/19/05 <br /> tert-Amyl methyl ether 0.625 0,025 mg/kg 0.564 111 80-130 5 <br /> Benzene 25 <br /> 0.197 0.050 0.194 102 65-125 3 24 <br /> tert-Butyl alcohol 6.74 5.0 5,37 126 80-165 8 25 <br /> Di-isopropyl ether 0.694 0.025 0.567 122 85-115 5 <br /> 1,2-Dibromoethane EDB 20 HL <br /> (EDB) 0.634 0.025 0.558 ]14 85-130 9 15 <br /> 1,2-Dichloroethane 0.546 0.025 4,552 99 63-124 6 <br /> Ethanol 25 <br /> Eth9.42 ] 5.31 177 35-150 15 40 HL <br /> ylbenzene tether 0.628 0.0255 0.564 111 80-125 ,. 4 I <br /> 25 <br /> F. Eth <br /> y 0.264 0.050 0.283 93 80-135 4 <br /> Methyl tett-butyl ether 0,275 0.025 0.263 105 75-115 5 35 <br /> Toluene 1.43 0.050 1.39 103 85.125 10 15 <br /> Xylenes(total) ii i <br /> 1.50 0.050 1.55 97 80-]40 5 20 � <br /> Gasoline Range Organics(C4-C12) 22,7 2.5 16.5 I38 60-140 3 25 <br /> i <br /> Surrogate:1,1-Dichloroethane-d4 0.00135 0.00250 94 60-125 <br /> Batch 5K16007-EPA 5035/EPA 8260B <br /> Blank(5KI6007-BLK1) Prepared&Analyzed: 11/16/05 <br /> tert-Amyl methyl ether ND 0.0050 mg/kg <br /> Benzene NO 0.0050 " <br /> tert-Butyl alcohol ND 0.020 <br /> Di-isopropyl ether ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 " IE <br /> 1,2-Dichloroethane NO 0.0050 <br /> Ethanol ND 0.10 IC <br /> Ethyl tert-butyl ether ND 0.0050 " <br /> Ethylbenzene ND 0.0050 <br /> Methyl tert-butyl ether ND 0.0050 <br /> Toluene ND 0.0050 " <br /> Xylenes(total) li <br /> ND 0.0050 <br /> F <br /> Gasoline Range Organics(C4-C12) ND 0.10 <br /> Surrogate:1,2-Dichloroethane-d4 0.00490 0.00500 98 60-125 <br /> f i <br /> FiSequoia 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 /> F This analytical report must be reproduced in Its entirety. <br /> D :; <br /> Page 9 of 12 <br />