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M <br /> j t Sequoia 885l,CA95037 <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation� L Arcot <br /> ] Project;ARGO#216$,Stockton,GA MOK0321 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: <br /> J 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 /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5K15030-EPA 5030B/5035A McOH/EPA 8260B <br /> Blank(5K15030-BLKI) Prepared; 11/I5/05 Analyzed: 11/19/05 <br /> tert-Amyl methyl ether ND 0.025 mg/kg <br /> Benzene ND 0.050 " <br /> tert-Butyl alcohol ND 5.0 " <br /> Di-isopropyl ether ND 0,025 " <br /> 1,2-Dibromoethane(EDB) ND 0.025 <br /> ,2-Dichlorcethane ND 0.025 <br /> Ethanol ND 10 <br /> Ethyl tert-butyl ether ND 0.025 <br /> Ethylbenzene ND 0.050 i <br /> Methyl.tert-butyl ether ND 0.025 <br /> Toluene ND 0.050 <br /> Xylenes(total) ND 0.050 " <br /> Gasoline Range Organics(C4-C 12) ND 2.5 " <br /> Surrogate:l,2-Dichloroethane-d4 0.00253 0.00250 101 60-125 <br /> Laboratory Control Sample(5K15030-BS1) Prepared: 11/15/05 Analyzed: 11/19/05 <br /> tert-Am 1 methyl ether <br /> Y Y 0.595 0.025 mg/kg 0.564 105 80-130 <br /> Benzene 0.192 0.050 0.194 99 65-125 <br /> tert-Butyl alcohol 6.25 5.0 5.37 116 80-165 <br /> Di-isopropyl ether 0.662 0.025 0.567 117 85-115 HL <br /> 1,2-Dibromoethane(EDB) 0.577 0.025 0.558 103 85-130 <br /> 1,2-Dichloroethane 0.515 0.025 0.552 93 63-124 <br /> Ethanol 8.08 10 5.31 152 35-150 HL <br /> Ethyl tert-butyl ether 0.602 0.025 0.564 107 80-125 <br /> Ethylbenzene 0.254 0.050 " 0.283 90 80-135 <br /> Methyl tert-butyl ether 0.262 0.025 ii 0.263 100 75-115 <br /> Toluene 1.30 0.050 1.39 94 85-125 <br /> Xylenes(total) 1.42 0.050 1.55 92 80-140 <br /> Gasoline Range Organics(C4-C12) 22.0 2.5 16.5 133 60-140 <br /> Surrogate, l,2-Dichloroethane-d4 0.00240 0.00150 96 60-125 � <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 8 of 12 <br />