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680 Chesapeake Drive Redwood Cl' N94063 (650)3649600 FAX(650)3649233 <br /> Sequoia 404 N.Wiget Lane Walnut Cree, .94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (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/IT 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 <br /> Sequoia Analytical -Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Preparef Analyzed Method Notes <br /> ND4 (W909267-01)Soil Sampled: 13-Sep-99 00:00 Received: 14-Sep-99 14:40 <br /> Methyl tort-butyl ether 0.41 0.10 mg/kg 100 9I21015 20-Sep-9 22-Sep-99 EPA 8260A <br /> Surrogate:Dibromofluoromethane 116% 50-150 <br /> SD4(W909267-02)Soil Sampled: 13-Sep-99 00:00 Received: 14-Sep-99 14:40 <br /> Methyl tert-butyl ether ND 0.10 mg/kg 100 9121015 20-Sep-99 23-Sep-99 EPA 8260A <br /> Surrogate:Dibromofluoromethane 100% 50-150 " <br /> ESW4(W909267-03)Soil Sampled: 13-Sep-99 00:00 Received: 14-Sep-99 14:40 <br /> Methyl tert-butyl ether ND 0.10 mg/kg 100 9I21015 20-Sep-99 23-Sep-99 EPA 8260A <br /> Surrogate:Dibromofluoromethane 84.0% 50-150 <br /> SPL4(W909267-04)Soil Sampled: 13-Sep-99 00:00 Received: 14-Sep-99 14:40 <br /> Methyl tert-butyl ether ND 0.10 mg/kg 100 9121015 20-Sep-99 23-Sep-99 EPA 8260A <br /> Surrogate:Dibromofluoromethane 84.0% 50-150 <br /> NSW4(W909267-05)Soil Sampled: 13-Sep-99 00:00 Received: 14-Sep-99 14:40 <br /> Methyl tert-butyl ether ND 0.10 mg/kg 100 9121015 20-Sep-99 23-Sep-99 EPA 8260A <br /> Surrogate:Dibromofluoromethane 84.0% 50-150 " <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed i n accordance with the chain of <br /> custody document.This analytical report must be reproduced in its entirety. <br /> Dimp e <br /> Shama,Project Manager Page 5 of 1 1 <br />