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North Ste <br /> Sequoia 1455 McDowell Petaaluma ,CA 94954 <br /> a- ) (707)792-1965 <br /> 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 801513/802111-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 /> Matrix Spike(3110425-MSI) Source:P311175-03 Prepared&Analyzed: 11/19/03 _ <br /> Gasoline Range Organics 641 14 ppmv 780 6.1 81 65-135 <br /> Gasoline Range Organics 2260 50 mg/ml Air 2750 21 81 65-135 <br /> Benzene 35.7 0.50 40.5 0.12 88 65-135 <br /> Benzene 11.2 0.16 ppmv 12.7 0.037 88 65-135 <br /> Toluene 223 0.50 mg/m'Air 208 0.45 107 65-135 <br /> Toluene 59.4 0.13 ppmv 55.4 0.12 107 65-135 <br /> Ethylbenzene 47.1 0.50 mg/ml Air 45.0 ND 105 65-135 <br /> Ethylbenzene 10.9 0.12 ppmv 10.4 ND 105 65-135 <br /> Xylenes(total) 240 0.50 mg/m'Air 218 ND 110 65-135 <br /> Xylenes(total) 55.4 0.12 ppmv 50.2 ND 110 65-135 <br /> Methyl tert-butyl ether 73.9 2.0 mg/m'Air 63.0 1.7 115 65-135 <br /> Methyl tert-butyl ether 20.5 0.56 ppmv 17.5 0.47 114 65-135 <br /> .Surrogate:a,a,a-Trifluorotoluene 50.9 " 50.3 101 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 304 mg/m'Air 300 101 65-135 <br /> Surrogate:4-Bromoflucrobenzene 288 11300 96 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.3 ppmv 41.9 96 65-135 <br /> Matrix Spike Da (3710425-MSDI) Source:P311175-03 Prepared&Analyzed: 11/19/03 <br /> Gasoline Range Organics 2210 50 mg/ml Air 2750 21 80 65-135 2 20 <br /> Gasoline Range Organics 628 14 ppmv 780 6.1 80 65-135 2 20 <br /> Benzene 34.9 0.50 mg/ml Air 40.5 0.12 86 65-135 2 20 <br /> Benzene 11.0 0.16 ppmv 12.7 0.037 86 65-135 2 20 <br /> Toluene 220 0.50 mg/ml Air 208 0.45 106 65-135 1 20 <br /> Toluene 58.5 0.13 ppmv 55.4 0.12 105 65-135 2 20 <br /> Ethylbenzene 47.4 0.50 mg/ml Air 45.0 ND 105 65-135 0.6 20 <br /> Ethylbenzene 10.9 0.12 ppmv 10.4 ND 105 65-135 0 20 <br /> Xylenes(total) 55.6 0.12 " 50.2 ND 111 65-135 0.4 20 <br /> Xylenes(total) 241 0.50 mg/m'Air 218 ND 111 65-135 0.4 20 <br /> Methyl tert-butyl ether 73.2 2.0 " 63.0 1.7 113 65-135 1 20 <br /> Methyl tert-butyl ether 20.4 0.56 ppmv 17.5 0.47 114 65-135 0.5 20 <br /> Surrogate:a,a,a-Trifluorotoluene 302 mg/mI Air 300 lot 65-135 <br /> Surrogate:a,a,a-Tris luorotoluene 50.7 ppmv 50.3 101 65-135 <br /> Surrogate:4-Bromofluorobenzene 288 mg/m'Air 300 96 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.3 ppmv 41.9 96 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 8 <br />