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Suite <br /> Sequoia 619 Striker 9 1-96 0 <br /> (i) FAX <br /> '� Sacramento,CA 95634(916)921-9600Analytical ww (916)921-0100 <br /> w.sequolalabs.wm <br /> It <br /> Upgradient-Valley Springs Project: La Finca Partnership# 1 Sampled: 9/15/00 <br /> 336 Augusta Court Project Number: N/A Received: 9/15/00 <br /> Valley Springs,CA 95252 Project Manager: San Joaquin EHD Reported: 9/29/00 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit IN, Notes* <br /> Batch: 0090198 Date Prepared: 9/20/00 Extraction Method: EPA 5030B [MeOHI <br /> Blank 0090198-BLKI <br /> Tert-butyl alcohol 9/20/00 ND mg/kg 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol ND 150 _ <br /> Surrogate: 1,2-DCA-d4 " 2.50 1.98 60.0-140 79.2 <br /> LCS 0090198-BSI <br /> Methyl tert-butyl ether 9/20/00 2.50 2.45 mg/kg 70.0-130 98.0 <br /> Surrogate: 1,2-DCA-d4 2.50 2.03 60.0-140 81.2 <br /> Matrix Spike 0090198-MS] 5009066-02 <br /> Methyl tert-butyl ether 9/20/00 2.50_ 6.54 __ 8.15 mg/kg 60.0-140 64.4 <br /> Surrogate: 1,2-DCA-d4 2.50 1.77 60.0-140 70.8 <br /> Matrix Spike Duo 0090198-MSD1 S009066-02 <br /> Methyl tert-butyl ether 9/20/00 _ 2.50 _ 6.54 8.83 mg/kg 60.0-140 _ 91.6 25.0 34.9--- 1 <br /> Surrogate: 1,2-DCA-d4 2.50 1.84 60.0-140 73.6 <br /> Sequoia Analytical-Sacramento *Refer to end ofreportfor text ofnotes and definitions. <br /> Page 7 of 8 <br />