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885 Jarvis Dr <br /> Sequoia Mogan Hill,CA 95037 <br /> a— N <br /> W Analytical FAX(408)782608 <br /> www sequoialabs coil <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 EIarth 01/07/03 14 23 <br /> Gasolme\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 [PIT] <br /> Laboratory Control Sample(3010002-BS2) Prepared&Analyzed 01/02/03 <br /> Surrogate Toluene-d8 00558 mg/kg 00500 112 60-140 <br /> Surrogate 4-BFB 00501 00500 100 60-140 <br /> Matrix Spike(3010002-MSI) Source 5212674-12 Prepared&Analyzed 01/01/03 <br /> Methyl tert-butyl ether 00338 00050 mg/kg 00448 AFD 74 60-140 <br /> Benzene 00212 00050 00272 ND 78 60-140 <br /> Toluene 0 173 00050 0 167 ND 103 60-140 <br /> Gasoline(C6-C 10) 209 1 0 220 ND 95 60-140 <br /> Surrogate 12-DCA-d4 00405 00500 81 60-140 <br /> Surrogate Toluene-d8 00607 00500 111 60-140 <br /> Surrogate 4-BFB 00525 00500 105 60-140 <br /> atrix Spike Dup(3010002-MSD1) Source 5212674-12 Prepared&Analyzed 01/01/03 <br /> Methyl tert-butyl ether 00332 00050 mg/kg 00448 ND 73 60-140 2 25 <br /> Benzene 00218 0 0050 00272 ND 80 60-140 3 25 <br /> Toluene 0 175 0 0050 0 167 ND 104 60-140 1 25 <br /> Gasoline(C6-C10) 2 13 1 0 220 ND 97 60-140 2 25 <br /> Surrogate 1 2-DCA-d4 00376 00500 75 60-140 <br /> Surrogate Toluene-d8 00554 00500 111 60-140 <br /> Surrogate 4-BFB 00500 00500 100 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 14 of 15 <br />