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t . <br /> Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)762-630$ <br /> www.scquoialabs.com <br /> URS Corporation[Arcoll Project:ARCO#2168,Stockton,CA MOK0321 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC81-00 10 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 11/23/05 12:41 <br /> 1. . <br /> Volatile Organic Compounds by EPA Method 82601B- Quality Control <br /> 1 <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> j I Batch 5K11009-EPA 50351 EPA 8260B <br /> FFF Matrix Spike(5K11009-MSJ) Source:MOK0320-01 Prepared&Analyzed: 11/11/05 <br /> tert-Amyl methyl ether 0.0128 0.0050 mg/kg 0.0150 0.00014 84 80-130 <br /> Benzene 0.00515 0.0050 0.00516 0.0016 69 65-125 <br /> tert-Butyl alcohol 0.256 0.020 " 0,143 0.011 171 80-135 LM <br /> Di-isopropyl ether 0.0151 0.0050 " 0.0151 ND 100 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0131 0.0050 1, 0.0149 ND 88 85-130 <br /> 1,2-Dichloroethane 0.0129 0.0050 110.0147 ND 88 63-124 l <br /> Ethanol 0.163 0.10 0.142 ND 115 35-150 <br /> IC i <br /> Ethyl tert-butyl ether 0.0133 0.0050 0.0150 ND 89 80-125 <br /> Ethylbenzene 0.00670 0.0050 0.00754 0.00055 82 80-135 <br /> Methyl tert-butyl ether 0.00853 0.0050 0.00702 ND 122 75-115 LM <br /> Toluene 0.0326 0.0050 0.0372 0.00016 87 85-125 <br /> Xylenes(total) 0.0362 0.0050 0.0412 0.00049 87 80-140 <br /> r Gasoline Range Organics(C4-C12) 0.702 0.10 0.440 0.50 46 53-126 LN <br /> Surrogate:42-Dichloroethane-d4 0.00411 11 <br /> 0.00500 82 60-125 , <br /> Matrix Spike Dup(5K11009-MSD1) Source:MOK0320-01 Prepared&Analyzed: 11/11/05 1 <br /> tert-Amyl methyl ether 0.0124 0.0050 mg/kg 0,0150 0.00014 82 80-130 3 25 1 <br /> Benzene 0.00521 0.0050 0.00516 0.0016 70 65-125 1 20 <br /> cert-Butyl alcohol 0.273 0.020 0.143 0.011 183 80-135 6 20 LM <br /> Di-isopropyl ether 0.0147 0.0050 0.0151 ND 97 85-115 3 20 <br /> 1,2-13ibromoethane(EDB) 0.0128 0.0050 0.0149 ND 86 85-130 2 15 <br /> I,2-Dichloroethane 0.0112 0.0050 0.0147 ND 76 63-124 14 25 <br /> Ethanol 0.159 0.10 0.142 ND 112 35-150 2 40 IC <br /> Ethyl tert-butyl ether 0.0128 0.0050 0.0150 ND 85 80-125 4 25 <br /> Ethylbenzene 0.00639 0,0050 0.00754 0.00055 77 80-135 5 20 LN <br /> Methyl tett-butyl ether 0.00758 0.0050 0.00702 ND 108 75-115 12 35 <br /> Toluene 0.0313 0.0050 0.0372 0.00016 84 85-125 4 15 LN <br /> Xylenes(total) 0.0344 0.0050 0.0412 0.00049 82 80-140 5 20 <br /> Gasoline Range Organics(C4-C 12) 0.657 0.10 0.440 0.50 36 53-126 7 25 LN <br /> Surrogate:42-Dichloroethane-d4 0.00383 0.00500 77 60-125 <br /> 6 .t <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 /> F <br /> This analytical report must be reproduced in its entirety. ; <br /> Page 7 of 12 <br />