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Dr <br /> a— ) <br /> Siqsss Ja 95 37Se 11U1a Mari HI©,CA 95037 Analytical (408)776-9600 <br /> FAX 408 7$2-6308 <br /> www sequoialabs can <br /> URS Corporation[1] Project ARCO#2093,Tracy,CA MLL0772 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO 92093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 01/07/03 14 23 <br /> Gasoline1BTEX\Oxygenates by EPA method 8260E- 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 2120501 -EPA 5030B IP/T] <br /> Blank(2120501-BLK2) Prepared&Analyzed 01/01/03 <br /> Surrogate 4-BFB 00494 mg/kg 00500 99 60-140 <br /> Laboratory Control Sample(2120501-BSI) Prepared&Analyzed 12/31/02 <br /> Methyl tert-butyl ether 00333 00050 mg/kg 00448 74 60-140 <br /> Benzene 00210 00050 00272 77 70-130 <br /> Toluene 0 172 00050 0 167 103 70-130 <br /> Gasoline(C6-C10) 208 10 220 95 70-130 <br /> Surrogate 12-DCA-d4 00391 00500 78 60-140 <br /> Surrogate Toluene-d8 00574 00500 115 60-140 <br /> Surrogate 4-BFB 00512 00500 102 60-140 <br /> Laboratory Control Sample(2120501-BS2) Prepared&Analyzed 01/01/03 <br /> Itelhyl tert-butyl ether 00332 00050 mg/kg 00448 74 60-140 <br /> enzene 00214 00050 " 00272 79 70-130 <br /> Toluene 0 171 00050 0 167 102 70-130 <br /> Gasoline(C6-C 10) 205 1 0 220 93 70-130 <br /> Surrogate 1 2-DCA-d4 00394 00300 79 60-140 <br /> Surrogate Toluene-d8 00574 00.500 115 60-140 <br /> Surrogate 4-BFB 00536 00.500 107 60-140 <br /> Matrix Spike(2120501-MSI) Source MLL0772-08 Prepared&Analyzed 12/31/02 <br /> Methyl cert-butyl ether 00362 00050 mg/kg 00448 ND 80 60-140 <br /> Benzene 00219 00050 00272 ND 81 60-140 <br /> Toluene 0 189 00050 0 167 ND 113 60-140 <br /> Gasoline(C6-C10) 189 1 0 220 ND 86 60-140 <br /> Surrogate 12-ACA-d4 0 0403 00500 81 60-140 <br /> Surrogate Toluene-d8 00613 00500 123 60-140 <br /> Surrogate 4-BFB 00549 00500 110 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 1 i of 15 <br />