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885 Jarvis Dr <br /> 4D Sequoia Magan Hill,CA 95037 <br /> IW Analytical (408)772-9 <br /> 600 <br /> FAX 408 782-6308 <br /> www sequotalabs can <br /> URS Corporation[11 Project ARCO#2093,Tracy,CA MLL0772 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 01/07/03 14 23 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Leel Result %REC Limits RPD Limit Notes <br /> Batch 2120501 -EPA 5030E [PIT] <br /> Blank(2120501-BLKi) Prepared&Analyzed 12/31/02 <br /> Ethanol ND 020 mg/kg <br /> Teri-butyl alcohol ND 0 050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 " <br /> Teri-amyl methyl ether ND 00050 " <br /> 1,2-Dichloroethane ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 <br /> Benzene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 00050 <br /> Xylenes(total) ND 0 010 " <br /> Gasoline(C6-C10) ND 10 " <br /> arrogate 12-DCA-d4 00342 00500 68 60-140 <br /> Surrogate Toluene-d8 00575 00-500 115 60-140 <br /> Surrogate 4-BFB 00482 00500 96 60 140 <br /> Blank(2120501-BLK2) Prepared&Analyzed 01/01/03 <br /> Ethanol ND 020 mg/kg <br /> Teri-butyl alcohol ND 0 050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 0 0050 " <br /> Teri-amyl methyl ether ND 00050 " <br /> 1,2-Dichloroelhane ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> Benzene ND 00050 " <br /> Ethylbenzene ND 00050 <br /> Toluene ND 00050 " <br /> Xylenes(total) ND 0 010 <br /> Gasoline(C6-C 10) ND 10 " <br /> Surrogate 12-DCA-d4 00397 00500 79 60-140 <br /> Surrogate Toluene-d8 00573 00500 115 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 /> Page 10 of 15 <br />