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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www.sequoialabs.wm <br /> URS Com-Sacramento Project: Arco Site 548,Stockton,CA P310501 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 11/04/03 12:38 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B-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 3100490-EPA 5030 waters <br /> Blank(3100490-BLK1) Prepared&Analyzed: 10/21/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/m'Air <br /> Benzene ND 0.50 " <br /> Benzene ND 0.16 ppmv <br /> Toluene ND 0.13 " <br /> Toluene ND 0.50 mg/ml Air <br /> Ethylbenzene ND 0.50 " <br /> Ethylbenzene ND 0.12 ppmv <br /> Xylenes(total) ND 0.12 " <br /> Xylenes(total) ND 0.50 mg/ml Air <br /> Methyl tert-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether ND 0.56 ppmv <br /> Surrogate:a,a,a-Trifluorotoluene 49.7 1150.3 99 65-135 <br /> Surrogate:a,a,a-Tris luorotoluene 196 mg/m'Air 300 99 65-135 <br /> Surrogate:4-Bromofluorobenzene 38.2 ppmv 41.9 91 65-135 <br /> Surrogate:4-Bromofluorobenzene 273 mg/m'Air 300 91 65-135 <br /> Laboratory Control Sample(3100490-BS1) Prepared&Analyzed:10/2 1/03 <br /> Gasoline Range Organics 635 14 ppmv 780 81 65-135 <br /> Gasoline Range Organics 2240 50 mg/ml Air 2750 81 65-135 <br /> Benzene 12.9 0.16 ppmv 10.7 121 65-135 <br /> Benzene 41.0 0.50 mg/ml Air 34.0 121 65-135 <br /> Toluene 217 0.50 " 208 104 65-135 <br /> Toluene 57.7 0.13 ppmv 55.4 104 65-135 <br /> Ethylbenzene 11.1 0,12 10.8 103 65-135 <br /> Ethylbenzene 48.3 0.50 mg/ml Air 47.0 103 65-135 <br /> Xylenes(total) 228 0.50 241 95 65-135 <br /> Xylenes(total) 52.6 0.12 ppmv 55.6 95 65-135 <br /> Methyl tert-butyl ether 73.1 2.0 mg/ml Air 56.0 131 65-135 <br /> Methyl tert-butyl ether 20.3 0.56 ppmv 15.6 130 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 342 mg/m'Air 300 114 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 57.3 ppmv 50.3 114 65-135 <br /> Surrogate:4-Bromofluorobenzene 292 mg/m'Air 300 97 65-135 <br /> Surrogate:4-Bromofluorobenzene 409 ppmv 41.9 98 65-135 <br /> Sequoia Analytical-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 5 of 7 <br />