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I' <br /> Sequoia 885t[,CJarvis 5037 <br /> '��'�' Morgan Hill,CA 95037 <br /> ' (408)776-9600 <br /> �► Analytical FAX(408)782-6308 <br /> www.scquoialabs.com <br /> F, <br /> URS Corporation rArcoI] Project:ARCO#2168,Stockton,CA MOK0900 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC8 1-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 11/30/05 12;2$ <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 /> Batch 5K23041-EPA 50351 EPA 8260B <br /> Blank(5K23041-BLKI) Prepared&Analyzed: 11/23/05 <br /> tent-Amyl methyl ether ND 0.0050 mg/kg <br /> Benzene ND 0.0050 <br /> tert-Butyl alcohol ND 0.020 " <br /> Di-isopropyl ether ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 <br /> r 1,2-Dichloroethane ND 0.0050 <br /> Ethanol ND 0.10 " <br /> Ethyl tert-butyl ether ND 0,0050 <br /> Ethylbenzene ND 0.0050 " JI <br /> Methyl tert-butyl ether ND 0.0050 <br /> Toluene ND 0.0050 <br /> Xylenes(total) ND 0.0050 <br /> Gasoline Range Organics(C4-C12) ND 0.10 <br /> Surrogate:l,2-Dichloroethane-d4 0.00370 0.00500 74 60-125 <br /> Laboratory Control Sample(5K23041-BSI) Prepared&Analyzed: 11/23/05 <br /> Cert-Amyl methyl ether 0.0166 0.0050 mg/kg 0.0150 111 80-130 <br /> I <br /> Benzene 0.00533 0.0050 0.00516 103 65-125 <br /> tert-Butyl alcohol 0.155 0.020 0.143 108 80-165 <br /> Di-isopropyl ether 0.0163 0.0050 0.0151 108 85-115 f <br /> i <br /> 1,2-Dibromoethane(EDB) 0.0167 0.0050 0.0149 112 85-130 <br /> 1,2-Dichloroethane 0.0176 0.0050 0.0147 120 63-124 <br /> Ethanol 0,150 0.10 0.142 106 35-150 <br /> Ethyl tert-butyl ether 0.0165 0.0050 0.0150 110 80-125 <br /> Ethylbenzene 0.00683 0.0050 0.00754 91 80-135 <br /> Methyl tert-butyl ether 0.00817 0.0050 " 0.00702 116 75-115 111, <br /> i <br /> Toluene 0.0360 0.0050 0.0372 97 85-125 <br /> Xylenes(total) 0.0396 0.0050 0.0412 96 80-140 <br /> Gasoline Range Organics{C4-C12) 0.527 0.10 0.440 120 53-126 <br /> Surrogate:1,1-Dichloroethane-d4 0.00450 0.00500 90 60-125 <br /> F i <br /> F. Sequoia Analytical-Morgan Hill <br /> q � g . The results in this report apply to the samples analyzed in accordance with the thorn 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 8 of 12 <br /> F <br />