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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, 92 95834- <br /> (916)9za-96M9600 <br /> FAX(916)921-0100 <br /> Analytical wwwsequoiaiabs.com <br /> IT Corporation-Sacramento Project: Tosco 4409,Stockton,CA Sampled: 7/20100 to 7121100 <br /> 1433 N.Market Blvd.,Ste. 1 Project Number: N/A Received: 7124100 <br /> Sacramento,CA 95834 Pro ect Manager: Mark Capps Reported: 819100 <br /> MTBE Confirmation by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 0080025 Date Prepared:_ 8/3/00 Extraction Method: EPA 503013 1MeOHl <br /> Blank 0080025-BLKI <br /> Methyl tert-butyl ether 813/00 ND mg/kg 0.100 <br /> Surrogate. 1,2-DCA-d4 " 1.50 1.53 to 60.0-140 101 <br /> LCS 0080025-BS1 <br /> Methyl tert-butyl ether. 8/3/00 2.50 2.42 mg/kg 70.0-130 96.8 <br /> Surrogate: 1,2-DCA-d4 It2.50 1.66 60.0-140 106 <br /> Matrix Spike 0080025-MSI S007267-09 <br /> Methyl tert-butyl ether 8/3/00 2.50 ND 2.04 mg/kg 60.0-140 81.6 <br /> Surrogate: 1,1-DCA-d4 2.50 2.15 60.0-140 86.0 <br /> Matrix Spike Dun 0080025-MSDI S007267-09 <br /> Methyl tert-butyl ether 8/3/00 2.50 ND 2.06 mg/kg 60.0-140 82.4 25.0 0.976 <br /> Surrogate: 1,2-DCA-d4 " 2.50 2.15 " 60.0-140 86.0 <br /> Batch: 0080074 Date Prepared: 814/00 Extraction Method: EPA 5030E FPITI <br /> Blank 0080074-BLKI <br /> Methyl tert-butyl ether 8/4/00 ND ug/I 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 57.6 60.0-140 115 <br /> LCS 0080074-BSI <br /> Methyl tert-butyl ether 814/00 50.0 47.0 ug/1 70.0-130 94.0 <br /> Surrogate: 1,2-DCA-d4 " 50.0 56.4 It 60.0-140 113 <br /> LCS Dup 0080074-BSDI <br /> Methyl tert-butyl ether 8/4/00 50.0 47.4 ug/i 70.0-130 94.8 25.0 0.847 <br /> Surrogate: 1,2-DCA-d4 " 50.0 56.6 If 60.0-140 113 <br /> Matrix Spike 0080074-MSI S007296-10 <br /> Methyi ter-butyl ether 8/4/00 50.0 ND 46.6 ug/1 60.0-140 93.2 <br /> Surrogate: 1,2-DCA-d4 50.0 49.0 60.0-140 98.0 <br /> Matrix Spike Dui) 0080074-MSDI S007296-10 <br /> Methyl tert-butyl ether 814/00 50.0 ND 45.4 ug/1 60.0-140 90.8 25_0 2.61 <br />--, - - - - - - -- <br /> Surrogate: 1,1-DCA-d4 50.0 47.4'--„ 60:0=140 94:$ � <br /> .Batch: 0080119 Date Prepared: 818/00 Extraction Method: EPA 5030B [MeOH] <br /> Blank 0080119-BLKI <br /> Methyl tert-butyl ether 8/9/00 ND mg/kg 0.100 <br /> Surrogate: 1.1-DCA-d4 2.50 2.39 60.0-140 95.6 <br /> Sequoia Analytical-Sacramento "Refer to end of report for text of notes and definitions. <br /> Page 11 of 13 <br />