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4DSequoia 1455 McDowell Blvd,North Ste D <br /> Pctaluma,CA 94954 <br /> Analytical 792-1865 1 <br /> FAX(707)792.0342342 <br /> www.sequoialabs.com <br /> URS Cote-Sacramento Project. Arco Site 548,Stockton,CA P401175 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 01129/04 14:59 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source '/oREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010217-EPA 5030B,waters <br /> Blank(4010217-BLK1) Prepared&Analyzed:01/14/04 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml 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 ten-butyl ether ND 2.0 " <br /> Methyl Cert-butyl ether ND 0.56 ppmv <br /> urrogate:a a,a-Trifluorotoluene 49.0 50.3 97 65-135 <br /> rrogate:a,a,a-Tris luorotoluene 292 mglm'Air 300 97 65-135 <br /> Surrogate:4-Bromofluarobenzene 40.2 ppmv 41.9 96 65-135 <br /> Surrogate:4-Bromofluorobenzene 287 mg/m'Air 300 96 65-135 <br /> Laboratory Control Sample(4010217-BSI) Prepared&Analyzed:01/14/04 <br /> Gasoline Range Organics 658 14 ppmv 780 84 65-135 <br /> Gasoline Range Organics 2320 50 mg/ml Air 2750 84 65-135 <br /> Benzene 12.8 0.16 ppmv 12.7 101 65-135 <br /> Benzene 40.9 0.50 mg/ml Air 40.5 101 65.135 <br /> Toluene 214 0.50 208 103 65-135 <br /> Toluene 56.8 0.13 ppmv 55.4 103 65-135 <br /> EthyUxnzene 11.1 0,12 104 107 65-135 <br /> Ethylbenzene 47.9 0.50 mg/ml Air 45.0 106 65-135 <br /> Xylenes(total) 224 0.50 218 103 65-135 <br /> Xylenes(total) 51.6 0.12 ppmv 50.2 103 65-135 <br /> Methyl tert-butyl ether 73.0 2.0 mg/m'Air 63.0 116 65-135 <br /> Methyl tert-butyl ether 20.3 0.56 ppmv 17.5 116 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 338 mglm'Air 300 113 65-135 <br /> Surrogate:a,a,a-Trfluorotoluene 56.7 ppmv 50.3 113 65-135 <br /> Surrogate:4-Bromofluorobenzene 311 mg/m'Air 300 104 65-135 <br /> Surrogate:4-Bromofluarobenzene 43.6 ppmv 41.9 104 65-135 <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 entirety. <br /> Page 4 of 6 <br />