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'^ ^ 885 JarvisDrive <br /> SCA equoia Morgan 4 507 <br /> 08)776-9600 <br /> Analytical FAX(408)782-6308 <br /> F, J www.sequoialabs.com <br /> F <br /> URS Corporation[Arcot] Project:ARCO 42168,Stockton,CA MOK0822 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC8 1-00 10 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 11/28/05 16:55 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> 3 <br /> Sequoia Analytical- Morgan Hill <br /> 4 Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> FBatch 5K21014-EPA 50351 EPA 8260E <br /> Matrix Spike(5K21014-MS1) Source:MOK0789-01 Prepared&Analyzed: 11/21/05 <br /> tert-Amyl methyl ether 0.0154 0.0050 mg/kg 0.0150 0.00015 102 80-130 <br /> Benzene 0.00495 0.0050 0.00516 ND 96 65-125 <br /> tertBuryl alcohol 0.155 0.020 0.143 0.0041 106 80-135 <br /> Di-isopropyl ether 0.0155 0.0050 0.0151 ND 103 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0140 0.0050 0.0149 ND 94 85-130 <br /> 1,2-Dichloroethane 0.0129 0.0050 0.0147 ND 88 63-124 <br /> Ethanol 0.107 0.10 0.142 ND 75 35-150 <br /> Ethyl tert-bury]ether 0.0156 0.0050 0.0150 ND 104 80-125 <br /> Ethylbenzene 0.00628 0.0050 0.00754 ND 83 80-135 <br /> Methyl tert-butyl ether 0.00810 0.0050 0.00702 0.0015 94 75-115 <br /> Toluene 0.0324 0,0050 0.0372 0.00030 86 85-125 t <br /> Xylenes(total) 0.0356 0.0050 0.0412 0.00083 84 80-140 <br /> Gasoline Range Organics(C4-C12) 0.451 0.10 '0.440 ND 102 53-126 <br /> Surrogate:1,2-Dichlaroethane-d4 0.00370 0.00500 74 60-125 <br /> Matrix Spike Dup(5K21014-MSD1) Source:MOK0789-01 Prepared&Analyzed: 11/21/05 <br /> tert-Amyl methyl ether 0.0152 0.0050 mg/kg 0.0150 0.00015 100 80-130 1 25 <br /> Benzene 0.00473 0.0050 0.00516 ND 92 65-125 5 20 <br /> tert-Butyl alcohol 0.150 0.020 0.143 0.0041 102 80-135 3 20 <br /> Di-isopropyl ether 0.0151 0.0050 " 0.0151 ND 100 85-115 3 20 <br /> 1,2-Dibromoethane(EDB) 0.0135 0.0050 0.0149 ND 91 85-130 4 15 <br /> 1,2-Dichloroethane 0.0140 0.0050 0.0147 ND 95 63-124 8 25 <br /> Ethanol 0.111 0.10 0.142 ND 78 35-150 4 40 <br /> Ethyl tert-butyl ether 0.0154 0.0050 0.0150 ND 103 80-125 1 25 <br /> Ethylbenzene 0.00613 0.0050 0.00754 ND 81 80-135 2 20 <br /> Methyl tert-butyl ether 0.00921 0.0050 0.00702 0.0015 110 75-115 13 35 <br /> Toluene 0.0306 0.0050 0.0372 0.00030 81 85-125 6 IS LN <br /> Xylenes(total) 0.0347 0.0050 " 0.04I2 0.00083 82 80-140 3 20 <br /> Gasoline Range Organics(C4-C12) 0.448 0.10 0.440 ND 102 53-126 0.7 25 <br /> Surrogate:1,2-Dichlaroethane-d4 0.00387 0.00500 77 60-125 } <br /> F <br /> F <br /> r <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 /> F <br /> Page 6 of 9 <br /> F1 <br />