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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> l (408)7769600 <br /> Adak Analytical FAX(408)782-6308 <br /> www.seGuoialabs.con <br /> URS Corporation f 11 Project: ARCO#548,Stockton,Ca MMC0693 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 04/07/03 14:18 <br /> Total PUrgeable Hydrocarbons (C6-C10)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:Eotal Air C0693-0 Sampled:03/20/03 12:00Received:03/20/0318:30 RT-04 <br /> Gasoline Range Organics(C6-C10) 18 10 mg/m3 Air 1 3C25009 03/24/03 03/24/03 8015Bm18021 <br /> B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 <br /> Ethylbenzene ND 0.10 " <br /> Xylenes(total) ND 0.10 <br /> Methyi tent-butyl ether ND 0.50 <br /> Surrokate:a,a,a-Trifluorotoluene 965% 56-134 <br /> INF Cat Air C0693-02Air Sampled:03/20/03 11:50 Received:03/20/03 18:30 HT-04 <br /> Gasoline Range Organics(C6-C10) 11 10 mg/ml Air 1 3C25009 03/24/03 03/24/03 8015Bm/8021 <br /> B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 " <br /> sEthylbenzene ND 0.10 <br /> Xylenes(total) ND 0.10 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrorale:a,a,a-Trifluorotoluene 84.0% 56-134 " " <br /> HT-04 <br /> EFF Air C0693-03 Air Sam led:03120/0311:40 Received:03120/0318:30 <br /> Gasoline Range Organics(C6-C10) ND 10 mg/ml Air 1 3025009 03/24/03 03/24/03 8015Bm/8021 <br /> B <br /> Benzene ND 0.10 <br /> Toluene ND 0.10 <br /> Ethylbenzene ND 0.10 n R <br /> Xylenes(total) ND 0.10 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-Trifluorotoluene 98.S% 56-134 " <br /> Sequoia Analytical-Morgan Hill 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 on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 4of8 <br />