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�a <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma.CA 94954 <br /> (707)792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> URS Corp-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 8015B18021B -Quality Control <br /> Sequoia Analyticai-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3110428-EPA 5030,waters <br /> Blank3( 110428-B_LKl) Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Benzene ND 0.16 ppmv <br /> Benzene ND 0.50 mg/m'Air <br /> Toluene ND 0.13 ppmv <br /> Toluene ND 0.50 mg/ml Air <br /> Ethylbenzene ND 0.12 ppmv <br /> Ethylbenzene ND 0.50 mg/ml Air <br /> Xylenes(total) ND 0.12 ppmv <br /> Xylenes(total) ND 0.50 mg/ml Air <br /> Methyl tert-butyl ether ND 0.56 ppmv <br /> •Methyl tert-butyl ether ND 2.0 mg/m3 Air <br /> Surrogate:a,a,a-Trifluorotoluene 291 300 97 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 48.7 ppmv 50.3 97 65-135 <br /> Surrogate:4-Bromofluorobenzene 269 mg/m'Air 300 90 65-135 <br /> Surrogate:4-Bromofluorobenzene 37.6 ppmv 41.9 90 65-135 <br /> Laboratory Control Sample(3110428-BS1) Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics 719 14 ppmv 780 92 65-135 <br /> Gasoline Range Organics 2530 50 mg/ml Air 2750 92 65-135 <br /> Benzene 13.7 0.16 ppmv 12.7 108 65-135 <br /> Benzene 43.8 0.50 mg/ml Air 40.5 108 65-135 <br /> Toluene 61,1 0.13 ppmv 55.4 110 65-135 <br /> Toluene 230 0.50 mg/ml Air 208 I 1 1 65-135 <br /> Ethylbenzene 11.6 0.12 ppmv 10.4 112 65-135 <br /> Ethylbenzene 50.1 0.50 mglm3Air 45.0 Ill 65-135 <br /> Xylenes(total) 55.6 0.12 ppmv 50.2 111 65-135 <br /> Xylenes(total) 241 0.50 mg/ml Air 218 111 65-135 <br /> Methyl tert-butyl ether 18.1 0.56 ppmv 17.5 103 65-135 <br /> Methyl tert-butyl ether 65.2 2.0 mg/ml Air 63.0 103 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 54.8 ppmv 50.3 109 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 327 mg/m3 Air 300 109 65-135 <br /> Surrogate:4-Bromofluorobenzene 290 300 97 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.6 ppmv 41.9 97 65-135 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> 0 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 6 of 8 <br />