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• <br /> ID <br /> 8Jarvis Drive <br /> Sequoia Morgan Hi Hill,CA 95037 <br /> (408)776-9600 <br /> it Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[ArcoIJ Project:ARCO#0595,CA MPA0143 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project Manag-Vernon P.Elarth 01/20/06 11:00 <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 6A12019-EPA 5030B/5035A McOH/EPA 8260B <br /> Blank(6A12019-BLKI) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether ND 0.025 mg/kg PF <br /> Benzene ND 0.050 " <br /> tent-Butyl alcohol ND 5.0 PE <br /> Di-isopropyl ether ND 0.025 PF <br /> 1,2-Dibromoethane(EDB) ND 0.025 " <br /> 1,2-Dichloroethane ND 0.025 " <br /> Ethanol ND 10 IC <br /> Ethyl tert-butyl ether ND 0.025 " <br /> Ethylbenzene ND 0.050 " <br /> Methyl tert-butyl ether ND 0.025 PF <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 0.00477 0.00500 95 60-115 <br /> Laboratory Control Sample(6A12019-BSI) Prepared&Analyzed:01/12/06 <br /> tert-Amyl methyl ether 0.439 0.025 mg/kg 0.564 78 80-130 HM,PF <br /> Benzene 0.183 0.050 0.194 94 65-125 <br /> tert-Butyl alcohol 4.75 5.0 5.37 88 80-165 PE <br /> Di-isopropyl ether 0.423 0.025 0.567 75 85-115 HM,PF <br /> 1,2-Dibromoethane(EDB) 0.600 0.025 0.558 108 85-130 <br /> 1,2-Dichloroethane 0.505 0.025 0.552 91 63-124 <br /> Ethanol 5.97 10 5.31 112 35-150 IC <br /> Ethyl tert-butyl ether 0.485 0.025 0.564 86 80-125 <br /> Ethylbenzene 0.268 0.050 0.283 95 80-135 <br /> Methyl tert-butyl ether 0.257 0.025 0.263 98 75-115 PF <br /> Toluene 1.41 0.050 1.39 101 85-125 <br /> Xylenes(total) 1.57 0.050 1.55 101 80-140 <br /> Gasoline Range Organics(C4-C12) 16.1 2.5 16.5 98 60-140 <br /> Surrogate:1,1-Dichloroethane-d4 0.00478 0.00500 96 60-115 <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 /> Page 6 of 8 <br />