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t <br /> F.' <br /> 4ij \ Sequoia 885 Jarvis Drive <br /> )- Morgan r Morgan Hill,CA 95037 <br /> F li{ Analytical (408)776-9600 <br /> J FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arcot] Project:ARCO#2168,Stockton,CA MOK0900 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project NumberGOC81-0010 Reported; <br /> F Sacramento CA,95833 ProjectManager:Vemon P.Elarth 11/30/05 12:28 <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 5K28012-EPA 5035/EPA 8260B <br /> Laboratory Control Sample(5K28012-BSI) Prepared&Analyzed: 11/28/05 <br /> Ftert-Amyl methyl ether 0.0147 0.0050 mg/kg 0.0150 98 80-130 <br /> Benzene 0.00457 0.0050 0.00516 89 65-125 <br /> tert-Butyl alcohol 0.145 0.020 0.143 101 80-165 <br /> Di-isopropyl ether 0.0143 0.0050 0.0151 95 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0147 0.0050 0X149 99 85-130 � <br /> 1,2-Dichloroethane 0.0156 0.0050 0.0147 106 63-124 ? <br /> Ethanol 0.121 0.10 0,142 85 35-150 <br /> Ethyl tert-butyl ether 0.0146 0.0050 „ 0.0150 97 80-125 <br /> Ethylbenzene 0.00614 0.0050 0.00754 81 80-135 ' <br /> Methyl tert-butyl ether 0.00759 0.0050 0.00702 108 75-115 <br /> i <br /> Toluene 0.0315 0.0050 0.0372 85 85-125 ! <br /> r <br /> Xylenes(total) 0.0351 0.0050 0.0412 85 $0.140 f <br /> F Gasoline cs i <br /> an <br /> Range Or C4-C12 <br /> g g ( ) 0.497 0.10 0.440 113 53-126 I <br /> Surrogate:1,2-Dichloroethane-d4 0.00473 0.00500 95 60-115 <br /> I <br /> Matrix Spike(5K28012-MS1) Source:MOK0801-03 Prepared&Analyzed: 11/28/05 <br /> tert-Amyl methyl ether 0.0119 0.0050 mg/kg 0.0150 0.00017 78 80-130 LN <br /> Benzene 0.00352 0.0050 0.00516 ND 68 65-125 <br /> tert-Butyl alcohol 0.131 0.020 0.143 ND 92 80-135 <br /> Di-isopropyl ether 0.0109 0.0050 0.0151 ND 72 85-115 LN <br /> 1,2-Dibromoethane(EDB) 0.0113 0.0050 0.0149 ND 76 85-130 LN <br /> 1,2-Dichloroethane 0.0106 0.0050 0.0147 ND 72 63-124 <br /> FEthanol 0.0879 0.10 0.142 ND 62 35-150 <br /> Ethyl tert-butyl ether 0.0114 0.0050 0.0150 ND 76 80-125 LN <br /> Ethylbenzene 0.00476 0.0050 0.00754 ND 63 80-135 LN <br /> Methyl tert-bury]ether 0.00546 0.0050 0.00702 ND 78 75-115 <br /> Toluene 0.0255 0.0050 0.0372 0.00020 68 85-125 LN <br /> Xylenes(total) 0.0302 0.0050 0.0412 ND 73 80-140 LN <br /> Gasoline.Range Organics(C4-C12) 0.350 0.10 0,440 ND 80 53-126 <br /> FSurrogate:1,2-Dichloroethane-d4 0.00333 0.00500 67 60-115 <br /> Sequoia Analytical-Morgan Hill l <br /> tl � g 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 he reproduced in its entirety. <br /> F <br /> Page 10 of 12 <br />