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f <br />`1 �1 <br />` ( ■ Sequoia 885 Jarvis Drive <br /> Anal tical Morgan Hill, 77 95037 <br /> -9600 <br /> V (408)776-9600 <br /> ry J FAX(408)782-6308 <br /> 1 � <br /> www.sequoialabs.corn <br /> f <br /> URS Corporation[Arco I] Project:ARCO##2168,Stockton,CA MOK0609 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC81-0010 Reported: <br /> f { Sacramento CA,95833 Project Manager.Vemon P.Elarth 11/28/05 I5:22 <br /> I + <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 %R&C Limits RPD Limit Notes <br /> Batch 5K17013-EPA 5035/EPA 82608 <br /> Laboratory Control Sample Dup(5K17013-BSDI) Prepared&Analyzed: 11/17/05 <br /> e Gasoline Range Organics(C4-C 12) 0.519 0.10 mg/kg 0.440 118 53-126 4 25 <br /> a Surrogate:1,2-Dichloroethane-d4 0.00540 11 0.00500 108 60-125 <br /> Matrix Spike(5K17013-MSI) Source:MOK0815-01 Prepared&Analyzed: 11/17/05 <br /> tert-Amyl methyl ether 0.00974 0.0050 mg/kg 0.0100 0.00014 96 80-130 <br /> Benzene 0.00962 0.0050 0.0100 ND 96 65-125 <br /> tert-Butyl alcohol 0.0537 0.020 0.0500 ND 107 80-135 <br /> Di-isopropyl ether 0.00985 0.0050 0.0100 ND 98 85-115 <br /> 1,2-Dibromoethane(EDB) 0.0109 0.0050 0.0140 ND 109 85-130 <br /> 1,2-Di_hloroethane 0.0101 0.0050 0.0100 ND 101 63-124 <br /> Ethanol 0.291 0.10 0.200 0.026 132 35-150 IC <br /> Ethyl tert-bury]ether 0.00939 0.0050 I' 0.0100 ND 94 80-125 <br /> Ethylbenzene 0.0103 0.0050 0.0100 ND 103 80-135 <br /> i <br /> Methyl tert-butyl ether 0.00965 0,0050 0.0100 ND 97 75-115 <br /> Toluene 0.00908 0.0050 0.0100 0.00025 88 85-125 j <br /> Xylenes(total) 0.0306 0.0050 0.0300 ND 102 80-140 <br /> I <br /> + Surrogate:l,2-Dichloroethane-d4 0.00501 0.00500 100 60-125 <br /> Matrix Spike Dup(5K17013-MSD]) Source:MOK0815-01 Prepared&Analyzed: 11/17/05 <br /> tert-Amyl methyl ether 0.00991 0,0050 mg/kg 0.0100 0.00014 98 80-130 2 25 <br /> s Benzene 0.00977 0.0050 0.0100 ND 98 65-125 2 20 <br /> tert-Butyl alcohol 0.0559 0.020 " 0.0500 ND 112 80-135 4 20 <br /> Di-isopropyl ether 0.00996 0.0050 0.0100 ND 100 85-115 1 20 <br /> 1,2-Dibromoethane(EDB) 0.0104 0.0050 0.0100 ND 104 85-130 5 15 <br /> 11 1,2-Dichloroethane 0.0110 0.0050 0.0104 ND 110 63-124 9 25 <br /> Ethanol 0.241 0.10 0.200 0.026 108 35-150 19 40 IC <br /> Ethyl tert-butyl ether 0.04964 0.0050 0.0100 ND 96 80-125 3 25 I <br /> + Ethylbenzene 0.0103 0.0050 11 0.0100 ND 103 80-135 0 20 <br /> Methyl tert-butyl ether 0.00994 0.0050 " 0.0100 ND 99 75-115 3 35 <br /> 7- Toluene 0.00907 0.0050 0.0100 0.00025 88 85-125 0.1 15 <br /> Xylenes(total) 0.0306 0.0050 0.0300 ND 102 80-140 0 20 <br /> Surrogate:l,2-Dichloroethane-d4 0.00524 0.00500 105 60-125 <br /> i <br /> Sequoia Analytical-Morgan Hill The results in this report s <br /> apply to the samples analyzed in accordance with the chain of h <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> p..�, This analytical report must be reproduced in its entirety. <br /> t <br /> Page 8 of 9 <br /> �7 } <br /> 1 <br /> 1 <br />