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Carlos, <br /> Industrial Road <br /> Sequoia <br /> San Carlos,CA 94070-4111 <br /> (650) 232-9600 <br /> 'Wr Analytical FAX(650)232-9612 <br /> Sequoia-Walnut Creek Project: Melissa Brewer Sampled: 9/8/99 <br /> 404 N.Wigett Lane Project Number: W909150 Received: 9/8/99 <br /> Walnut Creek,CA 94568 Project Manager: Dimple Reported: 9/9/99 <br /> MTBE by EPA Method 8260A/Quality Control <br /> Sequoia Analytical-San Carlos <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9090010 Date Prepared: 9/1/99 Extraction Method: EPA 5030B 1P/T1 <br /> Blank 9090010-BLK1 <br /> Methyl tert-butyl ether 9/1/99 ND mg/kg 0.100 <br /> Surrogate: 1,2-Dichloroethane-d4 " 2.50 2.13 It <br /> 70.0-121 85.2 <br /> Blank 9090010-BLK2 <br /> Methyl tert-butyl ether 9/8/99 ND mg/kg 0.100 <br /> Surrogate: 1,2-Dichloroethane-d4 2.50 2.70 70.0-121 108 <br /> LCS 9090010-BS1 <br /> Methyl ter -butyl ether 9/1/99 2.50 2.66 mg/kg 70.0-130 106 <br /> Surrogate: 1,2-Dichloroethane-d4 " 2.50 2.22 of 70.0-121 88.8 <br /> LCS 9090010-BS2 <br /> Methyl tert-butyl ether _ 9/8/99 2.69 mg/kg 70.0-130 <br /> Surrogate: 1,2-Dichloroethane-d4 112.50 2.73 70.0-121 109 <br /> Matrix Spike 9090010-MS1 L908210-01 2 <br /> Methyl tert-butyl ether 9/1/99 2.50 ND 2.25 mg/kg 60.0-140 90.0 <br /> Surrogate: 1,2-Dichloroethane-d4 112.50 1.88 70.0-121 75.2 <br /> Matrix Spike Dup 9090010-MSD1 L908210-01 2 <br /> Methyl tert-butyl ether 9/1/99 2.50 ND 3.20 mg/kg 60.0-140 128 25.0 34.9 <br /> Surrogate: 1,2-Dichloroethane-d4 It2.50 2.48 70.0-121 99.2 <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 12 of 13 <br /> 7 <br />