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5 e q u of a 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> 1W Analytical <br /> FAX(707)792-0342 <br /> www.soquoialabs.cvm <br /> URS Corn-Sacramento Project: Arco Site 548,Stockton,CA P311411 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 11/26/03 17:39 <br /> Purgeable Hydrocarbons and BTEX by EPA 801513/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 3110425-EPA 5030,waters <br /> Blank 3110425-BLKl Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/m'Air <br /> Benzene ND 0.16 ppmv <br /> Benzene ND 0.50 mglm'Air <br /> Toluene ND 0.50 " <br /> Toluene ND 0.13 ppmv <br /> Ethylbenzene ND 0.12 " <br /> Ethylbenzene ND 0.50 mg/ml Air <br /> Xylenes(total) ND 0.50 " <br /> Xylenes(total) ND 0.12 ppmv <br /> Methyl tert-butyl ether ND 0.56 " <br /> Methyl tert-butyl ether ND 2.0 mg/ml Air <br /> Surrogate:a,a,a-Trifluorotoluene 191 11 300 97 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 48.7 ppmv 50.3 97 65-135 <br /> Surrogate:4-Bromofluorobenzene 41.1 1141.9 98 65-135 <br /> Surrogate:4-Bromofluorobenzene 194 mg/m'Air 300 98 65-135 <br /> Laboratory Control Sample(3110425-BSI) Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics 729 14 ppmv 780 93 65-135 <br /> Gasoline Range Organics 2570 50 mg/m'Air 2750 93 65-135 <br /> Benzene 43.3 0.50 40.5 107 65-135 <br /> Benzene 13.6 0.16 ppmv 12.7 107 65-135 <br /> Toluene 61.8 0.13 55.4 112 65-135 <br /> Toluene 233 0.50 mg/ml Air 208 112 65-135 <br /> Ethylbenzene 48.9 0.50 45.0 109 65-135 <br /> Ethylbenzene 11,3 0.12 ppmv 10.4 109 65-135 <br /> Xylenes(total) 247 0.50 mg/m'Air 218 113 65-135 <br /> Xylenes(total) 57.0 0.12 ppmv 50.2 114 65-135 <br /> Methyl tert-butyl ether 22,6 0.56 1117.5 129 65-135 <br /> Methyl tert-butyl ether 81.3 2.0 mg/ml Air 63.0 129 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 56.2 ppmv 50.3 112 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 335 mg/m'Air 300 112 65-135 <br /> Surrogate,4-Bromofluorobenzene 42.5 ppmv 41.9 101 65-135 <br /> Surrogate:4-Bromofluorobenzene 304 mg/m'Air 300 101 65-135 <br /> Sequoia Amalytical-Petaluma The results in this report apply to the samples analyzed in accordance with the Chain <br /> of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 4 of 8 <br />