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a— ) (4885 Jams Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical <br /> 09)776-9600 <br /> FAX(408)782-6308 <br /> www sAmoialabs con <br /> rp <br /> URS Cooration[11 Project ARCO#2093,Tracy,CA MMD0164 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vern EIarth 04/16/03 08 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR- MMD 1 10 ter Sampled,03/31/03 11 40 Rece 04/02/03 16 <br /> Ethanol ND 100 ug/l I 3D10007 04/10/03 04/10/03 EPA 8260E <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 0 50 <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogale 1 2-Dichloroethane-d4 918% 78-129 " <br /> ATR-11 164-11 Water –Sainipled 03/31/0312 15 Received 04/02/03 16 30 <br /> Ethanol ND 100 ug/1 1 3D10007 04/10/03 04/10/03 EPA 8260B <br /> tent-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 0 50 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogate 12-Dtchloroethane-d4 966% 78-129 " <br /> ATR-12{MMDOI64-121 Water Sampled 03/31/0312.00 Received 04/02/03 16 30 <br /> Ethanol ND 100 ug/l 1 3D10007 04/10/03 04/10/03 EPA 8260B <br /> tert-Butyl alcohol ND 20 P, " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Dt-isopropyl ether ND 0 50 <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> Surrogate 11-Dtchloroethane-d4 924% 78-119 " <br /> i <br /> I <br /> I <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 /> bases This analytical report must be reproduced in its entirety <br /> 9of15 <br />