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(DPetaluma,Sequoia 1455 McDowell Blvd,North Ste D <br /> CA 94954 <br /> Analytical (707)792.1865X <br /> FA (707)792-0142 <br /> www.seguoialabs.com <br /> i. <br /> URS Corp-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 IT54 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Cat Air(P402257-01)Air Sampled:02/30/04 10:55 Received:02/11/04 10:00 <br /> Gasoline Range Organics 10 10 mg/ml Air 0.2 4020253 02/11/04 02/11/04 EPA <br /> 8015B/8021B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 " ^ <br /> Ethylbenzene ND 0.10 <br /> Xylenes(total) ND 0,10 <br /> Methyl tert-butyl ether ND 0.40 <br /> Surrogate:a,a,a-Trifluorotoluene 102% 65-135 " ^ <br /> Surrogate:4-Bromofluorobenzene 101 % 65-135 " <br /> Gasoline Range Organics 3.0 2.8 ppmv 0.2 ^ <br /> Benzene ND 0.032 <br /> Toluene ND 0.026 <br /> Ethylbenzene ND 0.024 ~ " <br /> Xylenes(total) ND 0.024 <br /> ethyl Cert-butyl ether ND 0.11 <br /> urragate:a,a,a-Trifluorotoluene --- - 102% 65-135 <br /> Surrogate:4-Bromofluorobenzene 101% 65-135 <br /> EFF Air(P402257-02)Air Sampled:02/10/04 10:45 Received:02/11/04 10:00 <br /> Gasoline Range Organics ND 10 mg/ml Air 0.2 4020253 02/11/04 02111/04 EPA <br /> 80151318021B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 ^ <br /> Ethylbenzene ND 0.10 <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.40 <br /> Surrogate:a,a,a-Trifluorotoluene /01% 65-135 " ^ <br /> Surrogate:4-Bromofluorobenzene 103% 65-135 ^ <br /> Gasoline Range Organics ND 2.8 ppmv 0.2 " <br /> Benzene ND 0.032 <br /> Toluene - - - - ND 0:026—" „ ,, „ <br /> Ethylbenzene ND 0.024 <br /> Xylenes(total) ND 0.024 <br /> Methyl tert-butyl ether ND 0.11 <br /> Surrogate:a,a,a-Trifluorotoluene 101 % 65-135 " <br /> Surrogate:4-Bromofluorobenzene 103% 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 stated, results are reported an a wet weight <br /> • basis. This analytical report must be reproduced in its entirety. <br /> Page 3 of 6 <br />