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f F <br /> Sequoia 885 Jarvis Drivc <br /> Morgan Hill,CA 95037 <br /> F Analytical (408)772- <br /> t J FAX(408)782-636300 <br /> 08 <br /> www.sequoialahS.com <br /> fr <br /> URS Corporation[Arco/] Project:ARCO 92168,Stockton,CA MOK0822 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC8 1-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 11/28/05 16:55 <br /> S <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> JIt <br /> Reporting Spike Source ^/DREG <br /> Analyte Result Limit Units Level Result %REC Limits RPD :RPD <br /> Limit Notes <br /> F Batch 5K22027-EPA 5030B/5035A McOH/EPA 8260B <br /> Blank(5K22027-BLKI) Prepared: 11/22/05 Analyzed: 11/23/05 <br /> Ftett-Amyl methyl etherND 0.025 mg/kg <br /> Benzene ND 0.050 <br /> tert-Butyl alcohol ND 5.0 " <br /> Di-isopropyl ether ND 0.025 <br /> i <br /> 1,2-Dibromoethane(EDB) ND 0.025 <br /> 1,2-Dichloroethane ND 0.025 <br /> Ethanol ND 10 „ <br /> F' Ethyl tent-butyl ether ND 0.025 <br /> Ethylbenzene ND 0.050 <br /> Methyl tert-butyl ether ND 0.025 " <br /> Toluene ND 0.050 " <br /> Xylenes(total) ND 0.050F, TM <br /> Gasoline Range Organics(C4-Cl2) ND 2.5 <br /> Surrogate:l,2-Dichloroethane-d4 0.00602 0,00500 120 60-125 <br /> rR <br /> Laboratory Control Sample(5K22027-BSI) Prepared: 11/22//05 Analyzed: 11/23/05 , <br /> tert-Amyl methyl ether 0.558 0.025 mg/kg 0.564 99 80-130 I' <br /> Benzene 0,177 0.050 0.194 91 65-125 " <br /> Ftett-Butyl alcohol 6.52 5.0 5.37 121 80-165 <br /> Di-isopropyl ether 0.526 0.025 0.567 93 85-115 <br /> 1,2-Dibromoethane(EDB) 0.619 0.025 0.558 111 85-130 <br /> 1,2-Dichloroethane 0.597 0.025 0.552 108 63-124 <br /> F. Ethanol 5.61 10 'r 5.31 106 35-150 <br /> Ethyl tent-butyl ether 0,545 0.025 0.564 97 80-125 `. <br /> Ethylbenzene 0.267 0.050 0.283 94 80-135 <br /> F Mcthyl <br /> tert-bury]ether 0.270 0.025 0.263 103 75-115 <br /> Toluene 1.32 0.050 1.39 95 85-125 <br /> Xylenes(total) 1.50 0.050 1,55 97 80-140 <br /> Gasoline Range Organics(C4-C 12) 15.3 2.5 16.5 93 60-140 <br /> FSurrogate:1,2-Dichloroethane-d4 0.00601 0.00500 120 60-125 <br /> F. <br /> F t 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 7 of 9 <br /> i <br />