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680 Chesapeake Drive Redwood City ' 94063 (650)3649600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek, 4598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA X5834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Pinnacle/TT Project: Arco <br /> 2201 Broadway Suite 101 Project Number: Arco#6080 Reported: <br /> Oakland CA,94612 Project Manager: Joel Coffman 28-Sep-99 12:07 <br /> MTBE by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 9I21015: Prepared 20-Sep-99 Using EPA 5030B [MeOH] <br /> Blank(9121015-BLKI) <br /> Methyl tert-butyl ether ND 0.10 mg/kg <br /> Surrogate:Dibromofluoromethane 2.85 2.50 114 50-150 <br /> LCS(9121015-BSI) <br /> Methyl tent-butyl ether 3.08 0.10 mg/kg 2.50 123 70-130 <br /> Surrogate:Dibromofluoromethane 2.90 2.50 116 50-150 <br /> Matrix Spike(9121015-MSI) Source:W909279-C3 <br /> Methyl tert-butyl ether 3.47 0.10 mg/kg 2.50 ND 139 60-150 <br /> Surrogate:Dibromofluorotnethane 2.60 2.50 104 50-150 <br /> Matrix Spike Dup(9121015-MSD1) Source:W909279-103 <br /> Methyl tert-butyl ether 3.60 0.10 mg/kg 2.50 ND 144 60-150 3.68 25 <br /> Surrogate:Dibromofluoromethane 3.00 2.50 120 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in mcordance with the chcdn of <br /> custody document.This analytical report must be reproduced in its entirety. <br /> Dimple Sharma,Froject Manager Page 9 of 1 1 <br />