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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a- )► Analytical FAX(707)792-4342 <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 8015111802113-Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyie Result Limit Units Leve) Result %REC Limits RPD Limit Notes <br /> Batch 3110428-EPA 5030,waters <br /> Matrix Spike(3110428-MSI) Source: P311277-01 Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics 724 14 ppmv 780 2.5 92 65-135 <br /> Gasoline Range Organics 2550 50 mg/m'Air 2750 ND 93 65-135 <br /> Benzene 13.9 0.16 ppmv 12.7 ND 109 65-135 <br /> Benzene 44.2 0.50 mg/ml Air 40.5 ND 109 65-135 <br /> Toluene 60.5 0.13 ppmv 55.4 0.083 109 65-135 <br /> Toluene 228 0.50 mg/ml Air 208 0.31 109 65-135 <br /> Ethylbenzene 50.4 0.50 1145.0 ND 112 65-135 <br /> Ethylbenzene 1I.6 0.12 ppmv 10.4 ND 112 65-135 <br /> Xylenes(total) 54.7 0.12 " 50,2 0.034 109 65-135 <br /> Xylenes(total) 237 0.50 mg/ml Air 218 ND 109 65-135 <br /> Methyl tert-butyl ether 20.5 0.56 ppmv 17.5 ND 117 65-135 <br /> •Methyl tert-butyl ether 73.9 2.0 mg/ml Air 63.0 ND 117 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 339 300 113 65-135 <br /> Surrogate:a,a.a-Triuorotoluene 56.8 ppmv 50.3 113 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.8 1141.9 97 65-1.35 <br /> Surrogate:4-Bromofluorobenzene 292 mg/m'Air 300 97 65-135 <br /> Matrix Spike Dup(3110428-MSDI) Source:P311277-01 Prepared&Analyzed: 11/19/03 _ <br /> Gasoline Range Organics 2540 50 mg/m'Air 2750 ND 92 65-135 0.4 20 <br /> Gasoline Range Organics 722 14 ppmv 780 2.5 92 65-135 0.3 20 <br /> Benzene 44.1 0.50 mg/ml Air 40.5 ND 109 65-135 0,2 20 <br /> Benzene 13.8 0.16 ppmv 12.7 ND 109 65-135 0.7 20 <br /> Toluene 60.8 0.13 " 55.4 0.083 110 65-135 0.5 20 <br /> Toluene 229 0.50 mg/m'Air 208 0.31 110 65-135 0.4 20 <br /> Ethylbenzene 50.3 0.50 45.0 ND 112 65-135 0.2 20 <br /> Ethylbenzene 11.6 0.12 ppmv 10.4 ND 112 65-135 0 20 <br /> Xylenes(total) 237 0.50 mg/ml Air 218 ND 109 65-135 0 20 <br /> Xylenes(total) 54.7 0.12 ppmv 50.2 0.034 109 65-135 0 20 <br /> Methyl tert-butyl ether 20.6 0.56 1117.5 ND 118 65-135 0.5 20 <br /> Methyl tert-butyl ether 74.2 2.0 mg/m'Air 63.0 ND 118 65-135 0.4 20 <br /> Surrogate:a,a,a-Trifluorotoluene 56.2 ppmv 50.3 112 65-135 <br /> Surrogate:a,a,a-Trifluorwoluene 335 mg/m'Air 300 112 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.7 ppmv 41.9 97 65-135 <br /> Surrogate:4-Bromofluorobenzene 291 mg/m'Air 300 97 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 7 of 8 <br />