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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.segnoialabs.com <br /> • URS Corporation[Arco II Project: ARCO#548,Stockton,Ca MMD0499 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: NIP Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 04/29/03 16:20 <br /> Total Purgeable Hydrocarbons(C6-C1.0) by EPA 8015B modified,BTEXM by EPA 8021B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air(MMD0499-01)Air Sampled:04/15/03 10:35 Received:04/15/03 14:20 <br /> Gasoline Range Organics(C6-C10) 13 10 mg/m'Air 1 3D17032 04/17/03 04/17/03 8015Bm18021B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 <br /> Ethylbenzene ND 0.10 " <br /> Xylenes(total) ND 0.10 " <br /> Methyl tent-butyl ether ND 0.50 <br /> Surrogate:a,a,a-Triuorotoluene 95.5% 56-134 " <br /> INF Cat Air(MMD0499-02)Air Sampled:04/15/03 10:30 Received:04/15/03 14:20 <br /> Gasoline Range Organics(C6-C10) 13 I0 mg/m'Air I 3DI7032 04/17/03 04/17/03 8015Bm/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 0.50 " <br /> Surrogate_a,a,a-Trifluorotoluene 106% 56-134 <br /> • EFF Air(MMD0499-03)Air Sampled:04/15/03 10:25 Received:04/15/03 14:20 _ <br /> Gasoline Range Organics(C6-C10) ND 10 mg/ml Air I 3DI7032 04/17/03 04/17/03 8015Bm/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 0.50 ~ <br /> Surrogate:a,a,a-Trifluorotoluene 80.0% 56-134 " <br /> Sequoia Analytical-Morgan Hili 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 /> 4 of 9 <br />