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l <br /> ell alum Nath Ste D <br /> 1455 Mcl7ow <br /> Sequoia Petaluma,CA 44954 <br /> I-a) (707)792-1865 <br /> Analytical FAX{707)M-0342 <br /> www,scquoiatabs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P3I0024 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 10/13/03 17:17 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B- 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 3090664-EPA 5030,waters <br /> Blank(3090664-BLK1) Prepared&Analyzed:09/30/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/ml Air <br /> Benzene ND 0.50 " <br /> Benzene ND 0.16 ppmv <br /> Toluene ND 0.13 " <br /> Toluene ND 0.50 mg/ml Air <br /> Ethylbenzene ND 0.50 " <br /> Ethylbenzene ND 0.12 ppmv <br /> Xylenes(total) ND 0.12 " <br /> Xylenes(total) ND 0.50 mglm'Air <br /> Methyl ten-butyl ether ND 2.0 " <br /> AMIethyl tett-butyl ether ND 0.56 ppmv <br /> arrogate:a,a a-Trifluorotoluene 53.4 50.3 106 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 318 mg/m'Air 300 106 65-135 <br /> Surrogate:4-Bromofluorobenzene 39.4 ppmv 41.9 94 65-135 <br /> Surrogate:4-Bromofluorobenzene 282 mg/m'Air 300 94 65-135 <br /> Laboratory Control Sample(3090664-BS1) Prepared&Analyzed:09/30/03 <br /> Gasoline Range Organics 684 14 ppmv 780 88 65-135 <br /> Gasoline Range Organics 2410 50 mg/ml Air 2750 88 65-135 <br /> Benzene 13.7 0.16 ppmv 10.7 128 65-135 <br /> Benzene 43.8 0.50 mg1W Air 34.0 129 65-135 <br /> Toluene 238 0.50 208 114 65-135 <br /> Toluene 63.4 0.13 ppmv 55.4 114 65-135 <br /> Ethylbenzene 11.6 0.12 10.8 107 65-135 <br /> Ethylbenzene 50.1 0.50 mg/m'Air 47.0 107 65-135 <br /> Xylenes(total) 256 0.50 241 107 65-135 <br /> Xylenes(total) 59.6 0.12 ppmv 55.6 107 65-135 <br /> Methyl tert-butyl ether 61.1 2.0 mg/ml Air 56.0 109 65-135 <br /> _Methyl tert-butyl ether 17.0 0.56 ppmv 15.6 109 65-135 <br /> Surrogate:a,a,a-Tris luorotoluene 359 mg/m'Air 300 120 65-135 <br /> Surrogate:a,a,a-Tris luorotoluene 60.1 ppmv 50.3 119 65-135 <br /> Surrogate:4-Bromofluorobenzene 300 mg/m'Air 300 100 65-135 <br /> Surrogate:4-Bromofluorobenzene 42.0 ppmv 41.9 100 65-135 <br /> �equoia 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 />