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Sequoia 1455 McDowell Hath Ste D <br /> 14DPetaluu ma,CA 94954 <br /> (707)792-1865 <br /> AW Analytical 7)792-0342 <br /> www.seqw.segcroialabs.can <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P305579 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager. Vernon P.Elarth 06/13/03 09:21 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source °/eREC RPD <br /> Analyte Result Limit Units Level Result °/.REC limits RPD limit Notes <br /> Batch 3050763-EPA 5030,waters <br /> Blank(3050763-BLK1) Prepared&Analyzed:05/30/03 <br /> Gasoline Range Organics ND 50 mg/m'Air <br /> Gasoline Range Organics ND 14 ppmv <br /> Benzene ND 0.16 " <br /> Benzene ND 0.50 mg/ml Air <br /> Toluene ND 0.13 ppmv <br /> Toluene ND 0.50 mg/m'Air <br /> Ethylbenzene ND 0.12 ppmv <br /> Ethylbenzene ND 0,50 mg/ml Air <br /> Xylenes(total) ND 0.12 ppmv <br /> Xylenes(total) ND 0.50 mg/m'Air <br /> Methyl tett-butyl ether ND 0.56 ppmv <br /> Methyl tett-butyl ether ND 2,0 mg/ml Air <br /> Surrogate:a,a,a-Trifluorotoluene 50.8 ppmv 50.3 101 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 303 mg/rn'Air 300 101 65-135 <br /> Surrogate:4-Bromofluorobenzene 302 300 101 65-135 <br /> Surrogate:4-Bromofluorobenzene 42.2 ppmv 41.9 101 65-135 <br /> Laboratory Control Sample(3050763-BSI) Prepared&Analyzed:05/30/03 <br /> Gasoline Range Organics 653 14 ppmv 780 84 65-135 <br /> Gasoline Range Organics 2300 50 mg/m'Air 2750 84 65-135 <br /> Benzene I2.1 0.16 ppmv 12.5 97 65-135 <br /> Benzene 38.7 0.50 mg/m'Air 40.0 97 65-135 <br /> Toluene 211 0.50 186 113 65-135 <br /> Toluene 56.2 0.13 ppmv 49.3 114 65-135 <br /> Ethylbenzene 10.3 0.12 10.8 95 65-135 <br /> Ethylbenzene 44.5 0.50 mg/m'Air 47.0 95 65-135 <br /> Xylenes(total) 230 0.50 210 110 65-135 <br /> Xylenes(total) 53.0 0.12 ppmv 48.6 109 65-135 <br /> Methyl tert-butyl ether 21.1 0.56 17.2 123 65-135 <br /> Methyl tert-butyl ether 76.0 2.0 mg/ml Air 62.0 123 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 56.0 ppmv 50.3 111 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 334 mg/m,Air 300 111 65-135 <br /> Surrogate:4-Bromofluorobenzene 44.6 ppmv 41.9 106 65-135 <br /> Surrogate:4-Bromofluorobenzene 319 mg/m'Air 300 106 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 5 of 7 <br />