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1455 McDowell Blvd,North Ste D <br /> Sequoia Peuiuma,CA 94954 <br /> 4, (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www,sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 548,Stockton,CA P306573 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 07/01/03 15:21 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060704-EPA 5030,waters <br /> Blank(3060704-BLKI) Prepared&Analyzed:06/27/03 <br /> Gasoline Range Organics ND 14 ppmv <br /> Gasoline Range Organics ND 50 mg/m'Air <br /> Benzene ND 0.50 " <br /> Benzene ND 0.16 ppmv <br /> Toluene ND 0.13 " <br /> Toluene ND 0.50 mg/m'Air <br /> Ethylbenzene ND 0.50 " <br /> Ethylbenzene ND 0.12 ppmv <br /> Xylenes(total) ND 0.12 " <br /> Xylenes(total) ND 0.50 mg/ml Air <br /> Methyl tent-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether ND 0.56 ppmv <br /> Surrogate:a,a,a-Trifluorotoluene 52.1 50.3 104 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 312 mg/m'Air 300 104 65-135 <br /> Surrogate. 4-Bromofluorobenzene 37.5 ppmv 41.9 89 65-135 <br /> Surrogate:4-Bromofluorobenzene 168 mg/m'Air 300 89 65-135 <br /> Laboratory Control Sample(3060704-BS]) Prepared&Analyzed:06/27/03 <br /> Gasoline Range Organics 586 14 ppmv 780 75 65-135 <br /> Gasoline Range Organics 2070 50 mg/m'Air 2750 75 65-135 <br /> Benzene 12.5 0.16 ppmv 10.5 119 65-135 <br /> Benzene 39.8 0.50 mg/ml Air 33.5 119 65-135 <br /> Toluene 204 0.50 " 202 101 65-135 <br /> Toluene 54.3 0.13 ppmv 53.8 101 65-135 <br /> Ethylbenzene 11.0 0.12 " 11.0 100 65-135 <br /> Ethylbenzene 47.6 0.50 mg/ml Air 47.5 100 65-135 <br /> Xylenes(total) 230 0.50 " 240 96 65-135 <br /> Xylenes(total) 53.1 0.12 ppmv 55.3 96 65-135 <br /> Methyl tert-butyl ether 48.3 2.0 mg/ml Air 54.5 89 65-135 <br /> Methyl tert-butyl ether 13.4 0.56 ppmv 15.1 89 65-135 <br /> Surrogate:a,a,a-Trfluorotoluene 346 mg/m'Air 300 115 65-135 <br /> Surrogate:a,a,a-Triuorotoluene 57.9 ppmv 50.3 115 65-135 <br /> Surrogate:4-Bromofluorobenzene 179 mg/m'Air 300 93 65-135 <br /> Surrogate:4-Bromofluorobenzene 39.0 ppmv 41.9 93 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 />