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Dr <br /> 4D Sequoia 8llams Mogan HiQ,,CA 9503737 <br /> AW <br /> Analytical (408)776.9600 <br /> J FAX(408)782-6308 <br /> www sequoialahs can <br /> URS 49Corporation[t] 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 VernElarth 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 Level Result %REC Limits RPD Limit Notes <br /> Batch 3010002-EPA 5030B [P/TJ <br /> Blank(3010002-BLK2) Prepared&Analyzed 01/02/03 <br /> Ethanol ND 020 mg/kg <br /> Tert-butyl alcohol ND 0 050 " <br /> Metbyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tent-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 /> Gasoline(C6-Cl0) ND 10 " <br /> rrogate 11-DCA-d4 00324 00500 65 60-140 <br /> Surrogate Toluene-d8 00606 00500 121 60-140 <br /> Surrogate 4-BFB 00517 00500 103 60-140 <br /> Laboratory Control Sample(3010002-BSI) Prepared&Analyzed 01/01/03 <br /> Methyl tert-butyl ether 00332 00050 mg/kg 00448 74 60-140 <br /> Benzene 00214 00050 00272 79 70-130 <br /> Toluene 0 171 00050 0 167 102 70-130 <br /> Gasoline(C6-Clo) 205 1 0 220 93 70-130 <br /> Surrogate 1 2-DCA-d4 00394 00500 79 60-140 <br /> Surrogate Toluene-d8 00574 00500 115 60-140 <br /> Surrogate 4-BFB 00536 00500 107 60-140 <br /> Laboratory Control Sample(3010002-BS2) Prepared&Analyzed 01/02/03 <br /> Methyl tent-butyl ether 00328 00050 mg/kg 00448 73 60-140 <br /> Benzene 00204 00050 00272 75 70-130 <br /> Toluene 0163 00050 0167 98 70-130 <br /> Gasoline(C6-C 10) 192 1 0 220 87 70-130 <br /> Surrogate 12-DCA-d4 00385 00500 77 60-140 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chat."of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> • This analytical report must be reproduced to its entirety <br /> Page 13 of 15 <br />