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885 Jarvis Dr <br /> Sequoia MaginHill,CA 95037 <br /> (408)776-9600 <br /> ' Analytical FAX(408)782-6308 <br /> www sequoialabs cam <br /> URS Corporation[1] 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 /> GasolineTTEX\Oxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lirrut Notes <br /> Batch 2120501-EPA 5030B IP/T] <br /> Matrix Spike Dup(2120501-MSDI) Source MLL0772-08 Prepared&Analyzed 12/31/02 <br /> Methyl cert-butyl ether 00344 0 0050 mg/kg 00448 ND 76 60-140 5 25 <br /> Benzene 00210 00050 00272 ND 77 60-140 4 25 <br /> Toluene 0 180 00050 0 167 ND 107 60-140 5 25 <br /> Gasoline(C6-CIO) 199 10 220 ND 90 60-140 5 25 <br /> Surrogate 1 2-DCA-d4 00402 00500 80 60-140 <br /> Surrogate Toluene-d8 00638 00500 128 60-140 <br /> Surrogate 4-BFB 00570 00500 114 60-140 <br /> Batch 3010002-EPA 5030B [PIT] <br /> Blank(3010002-BLK1) Prepared&Analyzed 01/01/03 <br /> Ethanol ND 020 mg/kg <br /> Tert-butyl alcohol ND 0 050 " <br /> ethyl tert-butyl ether ND 0 0050 <br /> Di isopropyl ether ND 00050 <br /> Ethyl tert-butyl ether ND 00050 " <br /> Tert-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 /> Gasolme(C6-CIO) ND 10 " <br /> Surrogate 12-DCA-d4 00397 00500 79 60-140 <br /> Surrogate Toluene-d8 00573 00500 115 60-140 <br /> Surrogate 4-BFB 00494 00500 99 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 12 of 15 <br />