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680 Chesapeake Drive Redwood Ci* -A 94063 (650)364 4 <br /> 9600 FAX(650)369233 <br /> S e u o i a 404 N.Wiget Lane Walnut Cret .94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,upt 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 12:01 <br /> Total Metals by EPA 6000/7000 Series Methods - 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 9I21016: Prepared 21-Sep-99 Using EPA 3050B <br /> Blank(9121016-BLKI) <br /> Lead ND 0.50 mg/kg <br /> LCS(9121016-BSI) <br /> Lead 49.5 0.50 mg/kg 50.0 99.0 80-120 <br /> LCS Dup(9121016-BSDI) <br /> Lead 49.0 0.50 mg/kg 50.0 98.0 80-120 1.02 20 <br /> Matrix Spike(9121016-MSI) Source:W909129-06 <br /> Lead 80.0 0.50 mg/kg 50.0 35 90.0 80-120 <br /> Matrix Spike Dup(9121016-MSDI) Source:W909129-06 <br /> Lead 80.0 0.50 mg/kg 50.0 35 90.0 80-120 0 20 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety. <br /> n <br /> Dimple Sharma,Project Manager Page 10 of 11 <br />