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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-4342 <br /> www.sequoialabs.com <br /> URS Corp-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 01/29/04 14:59 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPA <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010217-EPA S030B,waters <br /> Matrix Spike(4010217-MS1) Source:P401126-06 Prepared&Analyzed:01/14/04 <br /> Gasoline Range Organics 2320 50 mg/ml Air 2750 36 83 65-I35 <br /> Gasoline Range Organics 659 14 ppmv 780 10 83 65-135 <br /> Benzene 40.2 0.50 mg/ml Air 40.5 0.86 97 65-135 <br /> Benzene 12.6 0.16 ppmv 12.7 0.27 97 65-135 <br /> Toluene 55.5 0.13 55.4 0.077 100 65-135 <br /> Toluene 209 0.50 mg/m'Air 208 0.29 100 65-135 <br /> Ethylbenzene 47.7 0.50 " 45.0 ND 106 65-135 <br /> Elhylbenzene 11.0 0.12 ppmv 10.4 ND 106 65-135 <br /> Xylenes(total) 50.8 0.12 " 50.2 0.077 I01 65-135 <br /> Xylenes(total) 220 0.50 mglm'Air 218 0.34 101 65-135 <br /> Methyl tent-butyl ether 19.2 0.56 ppmv 17.5 0.21 109 65-135 <br /> Methyl tert-butyl ether 69.0 2.0 mg/m'Air 63.0 0.75 108 65-135. <br /> 4rrogale:a,a,a-Trifluorotoluene 53.4 ppmv 50.3 106 65-135 <br /> rrogate.aa,a-Tryluorotoluene 319 mg/m'Air 300 106 65-135 <br /> Surrogate:4-Bromofluorobenzene 42.1 ppmv 41.9 100 65-135 <br /> Surrogate:4-Bromofluorobenzene 301 mg/m'Air 300 100 65-135 <br /> I <br /> Matrix Spike Dup(4070217-MSD1) Source:P401126-06 Prepared&Analyzed:01/14/04 <br /> Gasoline Range Organics 642 14 ppmv _ -780 10 81 65-135 3 20 <br /> Gasoline Range Organics 2260 50 mg/ml Air 2750 36 81 65-135 3 20 <br /> Benzene 40.0 0.50 1140.5 0.86 97 65-135 0.5 20 <br /> Benzene 12.6 0.16 ppmv 12.7 0.27 97 65-135 0 20 <br /> Toluene 208 0.50 mg/ml Air 208 0.29 100 65-135 0.5 20 <br /> Toluene 55.3 0,13 ppmv 55.4 0.077 100 65-135 0.4 20 <br /> Ethylbenzene 10.8 0.12 10,4 ND 104 65-135 2 20 <br /> Ethylbenzene 46.8 0.50 mg/ml Air 45.0 ND 104 65-135 2 20 <br /> Xylenes(total) 217 0.50 218 0.34 99 65-135 1 20 <br /> Xylenes(total) 50.2 0.12 ppmv 50.2 0.077 100 65-135 1 20 <br /> Methyl tert-butyI ether 71.7 2.0 mg/ml Air 63.0 0.75 113 65-135 4 20 <br /> Methyl tent-butyl ether 19.9 0.56 ppmv 17.5 0.21 113 65-135 4 20 <br /> Surrogate:a,a,a-Triuorotoluene 55.2 " 50.3 110 65-135 <br /> Surrogate:a,a,a-Tris luorotoluene 330 mg/m'Air 300 110 65-135 <br /> Surrogate:4-Bromofluorobenzene 42.9 ppmv 41.9 102 65-135 <br /> Surrogate:4-Bromofluorobenzene 307 mg/"Air 300 102 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 6 <br />