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Sequoia 1455 McDowell Blvd,North Ste D <br /> ,�DPetaluma,CA 94954 <br /> Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Cote-Sacramento Project: Arco Site 548,Stockton,CA p402257 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36608 Reported- <br /> Sacramento CA,95833 Project Manager: Vernon P.Elarth 02/26/04 17:54 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br /> Sequoia Analytical-PetaIuma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020253-EPA 5030B,waters <br /> I <br /> Blank(4020253-BLK2) Preared&Anal zed.02/11/04 <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 mg/m'Air <br /> Methyl cert-butyl ether ND 2.0 " <br /> Methyl tert-butyl ether ND 0.56 ppmv <br /> urrogate:a,a,a-Trifluorotoluene 47.2 50.3 94 65-135 <br /> urrogate:a,a,a-Trifluorotoluene 282 mg/m'Air 300 94 65-135 <br /> Surrogate:4-Bromofluorobenzene 40.8 ppmv 41.9 97 65-135 <br /> Surrogate:4-Bromofluorobenzene 292 mg/m'Air 300 97 65-135 <br /> Laboratory Control Sample 4020253-BS1Prepared&Anal zed:02/11/04 <br /> Gasoline Range Organics 759 14 ppmv 780 97 65-135 <br /> Gasoline Range Organics 2670 50 mg/ml Air 2750 97 65-135 <br /> Benzene 12.8 0.16 ppmv 12.5 102 65-135 <br /> Benzene 40.7 0.50 mglm'Air 40.0 102 65-135 <br /> Toluene 212 0.50 186 114 65-135 <br /> Toluene 56.3 0.13 ppmv 49-3 114 65-135 <br /> Ethylbenzene 11.2 0.12 1110.0 112 65-135 <br /> Ethylbenzene 48.5 0.50 mg/m'Air 43.5 111 65-135 <br /> Xylenes(total) 227 0.50 210 108 65-135 <br /> Xylenes(total) 52.3 0.12 ppmv 48.6 108 65-135 <br /> Methyl cert-butyl ether 58.7 2.0 mg/m'Air 62.0 95 65-135 <br /> Methyl tert-butyl ether 16.3 0.56 ppmv 17.2 95 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 303 mg/m'Air 300 101 65-135 <br /> Surrogate:a,a,a-Trifluorotoluene 50.8 ppmv 50.3 101 65-135 <br /> Surrogate:4-Bromofluorobenzene 304 mg/m'Air 300 101 65-135 <br /> Surrogate:4-Bromofluorobenzene 42.5 ppmv 41.9 101 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 slated,results are reported an a wet weight <br /> . basis. This analytical report must be reproduced in its entirety. <br /> Page 4 of 6 <br />