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885 Jarvis Dv <br /> c <br /> Sequoia Morgan Hill,CA 45037 <br /> F' <br /> 15) <br /> 08 <br /> Analytical (408)776-9600 <br /> + cvww.scquoFAX(408i labs c3om <br /> t URS Corporation[Arco!] Project:ARCO#2168,Stockton,CA MOK0822 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOCS 1-00 10 Reported; <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 11/28/05 16:55 <br /> J <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 5K21014-EPA 50351 EPA 8260E <br /> Blank(5K21014-BLK1) Prepared&Analyzed: 11/21/05 <br /> tert-Amyl methyl ether ND 0.0050 mg/kg <br /> Benzene ND 0.0050 I' <br /> tert-Butyl alcohol ND 0.020 <br /> Di-isopropyl ether ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 <br /> (` • 1,2-Dichloroethane ND 0.0050 <br /> Ethanol ND 0.10 " <br /> FEthyl tert-butyl ether ND 0.0050 " <br /> . Ethylbenzene ND 0.0050 " <br /> Methyl tent-butyl ether ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> FXylenes(total) ND 0.0050 " <br /> Gasoline Mange Organics(C4-C12) ND 0.10 " <br /> Surrogate, l,2-Dichloroethane-d4 0.00433 0.00500 87 60-125 <br /> Laboratory Control Sample(5K21014-BS1) Prepared&Analyzed: 11/21/05 <br /> tert-Amyl methyl ether 0.0161 0.0050 mg/kg 0.0150 107 80-130 <br /> Benzene 0.00530 0.0050 0.00516 103 65-125 <br /> tert-Butyl alcohol 0.157 0.020 0.143 110 80-165 <br /> Di-isopropyl ether 0.0160 0.0050 0.0151 106 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0165 0.0050 0.0149 111 85-130 <br /> 1,2-Dichloroethane 0.0138 0.0050 0.0147 94 63-124 <br /> Ethanol 0.152 0.10 „ 0.142 107 35-150 <br /> Ethyl tert-butyl ether 0.0163 0.0050 0.0150 109 80-125 <br /> Ethylbenzene 0.00730 0.0050 0.00754 97 80-135 <br /> { Methyl tert-butyl ether 0.00703 0.0050 „ 0.00702 100 75-115 <br /> Toluene 0.0364 0.0050 0.0372 98 85-125 <br /> Xylenes(total) 0.0410 0.0050 0,0412 100 80-140 <br /> Gasoline Range Organics(C4-C 12) 0.542 0.10 0.440 123 53-126 <br /> Surrogate, l,2-Dichloroethane-d4 0.00351 0.00500 70 60-125 <br />� t <br /> r <br /> F. <br /> FSequoia 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 5 of 9 <br /> i <br />