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Sequoia885Jarvis° <br /> Morgan Hid,CA 95037 <br /> Analytical (408)776-9600 <br /> FAx(408)782-6308 <br /> www.wgtwialabs.cmt <br /> URS Corporation[1] Project: ARCO#548,Stockton,Ca MMA0516 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager. Vern Elarth 01/27/03 14:40 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air(ppmv) by DHS LUFT <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF Total Air(MMA0516-01)Air Sampled:01/2210310:20 Received:01/22/0316.-25 _ <br /> Purgeable Hydrocarbons ND 2.8 ppmv 1 3010437 01/24/03 01/24/03 DHS LUFF - <br /> Benzene ND 0.016 " ^ <br /> Toluene ND 0.013 " ^ <br /> Ethylbenzene ND 0.012 <br /> Xylenes(total) ND 0.012 " Q-28 <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Tris luoro[oluene 73% 60-140 " <br /> INF Cat Air(MMA0516-02)Air _Sampled:01/22/03 10:10 Received:01/22/03 16:25 <br /> Purgeable Hydrocarbons ND 2.8 ppmv 1 3010437 41/24/03 01/24/03 DHS LUFT <br /> Benzene ND 0.016 " ^ <br /> Toluene ND 0.013 <br /> Ethylbenzene ND 0.012 " ^ <br /> Xylenes(total) ND 0.012 " ^ ^ Q-28 <br /> Methyl tent-butyl ether ND 0.14 ^ ^ <br /> 0urroga[e:a,a,a-Tr�uorotoluene 65% 60-140 ^ " _ <br /> EFF Alr(MMA0516-03)Air Sampled:_01122/03 10:!10 Received:01/22/0316:25 <br /> Purgeable Hydrocarbons ND 2.8 ppmv .1 3010437 01/24/03 01/24/03 DHS LUFr <br /> Benzene ND 0.016 <br /> Toluene ND 0.013 " " " ^ <br /> Ethylbenzene ND 0.012 <br /> Xylenes(total) ND 0.012 <br /> Methyl tent-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Trifluorololuene 67% 60-140 <br /> Sequoia Analytical-Morgan Hill 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 7 <br />