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r j <br /> Sequoia 885 Jarvis Drive <br /> Morgan Hill,CA 95437 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> f <br /> URS Corporation[Arcot] Project:ARCO#2168,Stockton,CA MOK0321 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC81-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 11/23/05 12:41 <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 5KI6007-EPA 5035/EPA 8260B <br /> Laboratory Control Sample(5K16007-BSI) Prepared&Analyzed: 11/16/05 <br /> ( " tert-Amyl methyl ether 0.0158 0.0050 mg/kg 0.0150 105 80-130 <br /> Benzene 0,00511 0.0050 0.00516 99 65-125 <br /> tert-Butyl alcohol 0.145 0.020 0.143 101 80-165 <br /> Di-isopropyl ether 0.0161 0.0050 0.0151 107 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0160 0.0050 11 0.0149 107 85-130 <br /> t hl <br /> 1,2-Dicoroethane <br /> f 0.0180 0.0050 0.0147 122 63-124 <br /> Ethanol 0.196 0.10 0.142 138 35-150 IC <br /> Ethyl tent-butyl ether 0.0162 0.0050 0.0150 108 80-125 <br /> Ethylbenzene 0.00727 0.0050 0.00754 96 80-135 <br /> Methyl tert-butyl ether 0.00825 0.0050 0.00702 <br /> 118 75-115 HL <br /> Toluene 0.0320 0.0050 0.0372 86 85-125 <br /> Xylenes(total) 0.0398 0.0050 " 0.0412 97 80-140 <br /> Gasoline Range Organics(C4-C 12) 0.514 0.10 0.440 117 53-126 <br /> Surrogate:l,1-Dichloroethane-d4 0.00532 0.00500 106 60-125 <br /> Matrix Spike(5K16007-MSI) Source:MOK0689-01 Prepared&Analyzed: 11/16/05 <br /> tert-Amyl methyl ether0.0156 0.0050 mg/kg 0.0150 0.00015 103 80-130 <br /> Benzene 0.00501 0.0050 0.00516 ND 97 65-125 <br /> tert-Butyl alcohol 0.144 0.020 ii 0.143 ND 101 80-135 <br /> Di-isopropyl ether 0.0161 0.0050 0.0151 ND 107 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0150 0.0050 0.0149 ND 101 85-130 <br /> 1,2-Dichloroethane 0.0162 0.0050 0.0147 ND 110 63-124 <br /> Ethanol 0.179 0.10 0.142 0.026 108 35-150 IC <br /> Ethyl tert-butyl ether 0.0162 0.0050 0.0150 ND 108 80-125 <br /> Ethylbenzene 0.00668 0.0050 0.00754 ND 89 80-135 <br /> Methyl tert-bury]ether 0.00798 0.0050 0.00702 ND 114 75-115 <br /> Toluene 0.0301 0.0050 0,0372 0.00021 80 85-125 LN <br /> Xylenes(total) 0.0368 0.0050 0.0412 0.00072 88 80-140 <br /> Gasoline Range Organics(C4-C12) 0.977 0.10 0.440 0.71 61 53-126 <br /> Surrogate:l,1-Dichloroethane-d4 0.00505 0.00500 101 60-125 <br /> F <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 staled,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety, <br /> Page 10 of 12 <br />