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a <br /> I � I <br /> ~ 1455 McDowell Blvd,North Ste D <br /> Sequoia <br />{# Petaluma,CA 94454 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.com <br /> l <br /> y <br />! URS Corp-Sacramento Project: Arco Site 434,Lodi,CA P404300 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: G09JZ-0035 Reported: <br /> Sacramento CA,95833 Project Manager. Vernon P.Elarth 04/15/04 16:48 <br /> BTEX by 8021B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike S7ce %REC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 4040336-EPA 5030,soils ! <br /> Blank(4040336-BLKI) Prepared&Analyzed:'04/14/04 <br /> i Benzene ND 0.0050 mg/kg - <br /> Toluene ND 0.0050 <br /> Ethylbenzene ND 0.0050 " <br /> i <br /> Xylenes(total) ND 0.0050 " <br /> i Surrogate:a.a,a-Trifluorotoluene 0.283 0.300 94 65-135 <br /> Laboratory Control Sample(4040336-BSI) Prepared&Analyzed:04/14/04 <br /> Benzene 0.0321 0.0050 mg/kg 0.0335 96 65-135 <br /> I Toluene 0.172 0.0050 0.190 91 65-135 <br /> Ethylbenzene 0.0408 0.0050 0.0455 90 65-135 <br /> I� Xylenes(total) 0.197 0.0050 0.222 89 65-135 <br /> h <br /> Surrogate:a,a,a-Triuorotoluene 0.272 0.300 91 65-135 <br /> Matrix Spike(4040336-MSI) Source:P404234-19 Prepared&Analyzed:04/14/04 <br /> Benzene 0.0713 0.010 mg/kg 0.06700.0035 101 65-135 <br /> To]uene0.395 0.010 0.379 0.083 82 65-135 <br /> Ethylbenzene 0.0877 0.010 0.0910 0.0052 91 65-135 <br /> Xylenes(total) 0.409 0.010 0.444 0.018 88 65-135 <br /> Surrogate:a,a,a-Tris luorotoluene 0.189 0.300 96 65-135 <br /> Matrix Spike Dup(4040336-MSD]) Source:P404234-19 Prepared&Analyzed:04/14/04 <br /> Benzene 0.0374 0.010 mg/kg 0.0670 0.0035 51 65-135 62 20 QC20,QM07 <br /> Toluene 0.236 0.010 0.374 0.083 40 65-135 50 20 QC20,QM07 <br /> Ethylbenzene 0.0459 0.010 0.0910 0.0052 45 65-135 63 20 QC20,QM07 <br /> Xylenes(total) 0217 0.010 0.444 0._018 45 65-135 61 20 QC20,QM07 <br /> Surrogate:a,a,a-Tris luorotoluene 0.280 0.300 93 65-135 <br /> t <br /> III 1 <br /> I <br /> Sequoia Analytical-Petaluma 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 entirely. <br /> Page 7 of 9 <br /> i <br /> l l <br />