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Dr <br /> Sequoia Morgan 11i1,CA 95037 <br /> slCA95037i037 <br /> (408)776.9600 <br /> Analytical FAx(408)762 6308 <br /> . www.sequoialabs.con <br /> URS Corporation f 11 Project: ARCO#548,Stockton,Ca MMB0732 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 03/18/03 18:06 <br /> Total Purgeable Hydrocarbons (C6-C10)by EPA 8015B modified,BTEX 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(NIIMB0732-01)Air Sampled:-02125/03 12:55 Received:02/25/03 15:50 <br /> Gasoline Range Organics(C6-CIO) 14 2.4 ppmv t. 3B27021 02/27/03 02/27/03 8015Bm18021 <br /> B <br /> Benzene ND 0.031 <br /> Toluene 0.067 0.027 " <br /> Ethylbenzene ND 0.023 <br /> Xylenes(total) 0.27 0.023 <br /> Methyl tert-butyl ether ND 0.14 <br /> Surrogate:a,a,a-Trifluorotoluene 115% 56-134 <br /> INF Cat Air(MAM0732-02)Air Sampled:02/25/03 12:50 Received:02/.25/03 15:50 <br /> Gasoline Range Organics(C6-CIO) 14 2.4 ppmv 1 3B27021 02/27/03 02/27/03 8015Bm/8021 <br /> B <br /> Benzene ND 0.031 <br /> Toluene 0.068 0.027 <br /> Ethylbenzene ND 0.023 <br /> Xylenes(total) 0.28 0.023 " <br /> Methyl tent-butyl ether ND 0.14 <br /> Surrogate:a,a.a-Trifluorotoluene 112% 56-134 ^ " <br /> EFF Air(M MB0732-03)Air Sampled:02/25/03 12:45 Received:_02/25/0315:50__ <br /> Gasoline Range Organics(C6-C10) ND 2.4 ppmv 1 3B27021 02/27/03 02/27/03 8015Bm/8021 <br /> B <br /> Benzene ND 0.031 <br /> Toluene ND 0.027 <br /> Ethylbenzene ND 0.023 " <br /> Xylenes(total) ND' 0.023 <br /> Methyl tort-butyl ether ND 0.14 <br /> Surrogate:a,a,a-Trifluorotoluene 104% 56-134 " <br /> �equoia 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 /> 3 of 9 <br />