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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> iW Analytical FAX(707)792-0342 <br /> 0 www.sequoialabs.00m <br /> URS Corp-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 I2:38 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Sotuee %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3100490-EPA 5030,waters <br /> Matrix Spike(3100490-MS1) Source:P310257-01 Prepared&Analyzed: 10/21/03 <br /> Gasoline Range Organics 2150 50 mg/ml Air 2750 13 78 65-135 <br /> Gasoline Range Organics 611 14 ppmv 780 3,6 78 65-135 <br /> Benzene 39.1 0.50 mg/ml Air 34.0 ND 115 65-135 <br /> Benzene 12.3 0.16 ppmv 10.7 ND 115 65-135 <br /> Toluene 55.6 0.13 1. 55.4 0.038 100 65-135 <br /> Toluene 209 0.50 mgim'Air 208 0.14 100 65-135 <br /> Ethylbenzene 46.1 0.50 " 47.0 ND 98 65-135 <br /> Ethylbenzene 10,6 0.12 ppmv 10.8 ND 98 65-135 <br /> Xylenes(total) 51.0 0.12 " 55.6 0.10 92 65-135 <br /> Xylenes(total) 221 0.50 mg/ml Air 241 0,44 92 65-135 <br /> Methyl cert-butyl ether 21.0 0.56 ppmv 15.6 0.68 130 65-135 <br /> Methyl Cert-butyl ether 75.6 2.0 mg/ml Air 56.0 2.4 131 65-135 <br /> SSurrogate,a,a,a-Trifluorotoluene 57.1 ppmv 50.3 114 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 341 mg/m'Air 300 114 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.9 ppmv 41.9 98 65-135 <br /> Surrogate:4-Bromofluorobenzene 293 mg/m'Air 300 98 65-135 <br /> Matrix Spike Dup(3100490-MSD1) Source_:P31€1257-01 Prepared&Analyzed: 10/21/03 - <br /> Gasoline Range Organics 606 14 ppmv 780 3.6 77 65-135 0.8 20 <br /> Gasoline Range Organics 2130 50 mg/m'Air 2750 13 77 65-135 0.9 20 <br /> Benzene 38.9 0.50 34.0 ND 114 65-135 0.5 20 <br /> Benzene 12.2 0.16 ppmv 10.7 ND 114 65-135 0.8 20 <br /> Toluene 206 0.50 mg/ml Air 208 0.14 99 65-135 1 20 <br /> Toluene 54.9 0.13 ppmv 55.4 0.038 99 65-135 1 20 <br /> Etbylbenzene 10.4 0.12 1110.8 ND 96 65-135 2 20 <br /> Ethylbenzene 45.1 0.50 mg/ml Air 47.0 ND 96 65-135 2 20 <br /> Xylenes(total) 217 0.50 241 0.44 90 65-135 2 20 <br /> Xylenes(total) 50.0 0.12 ppmv 55.6 0.10 90 65-135 2 20 <br /> Methyl tert-butyl ether 77.9 2.0 mg/m'Air 56.0 2.4 135 65-135 3 20 <br /> Methyl tett-butyl ether 21.6 0.56 ppmv 15.6 0.68 134 65-135 3 20 <br /> Surrogate:a,a.a-Trifluorotoluene 55.7 1150.3 111. 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 332 mg/m'Air 300 111 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.5 ppmv 41.9 97 65-135 <br /> Surrogate, 4-Bromofluorobenzene 290 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 6 of 7 <br />