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• 404 N.Wiget Lane <br /> S e qu o l a Walnut Creek,CA 94598 <br /> 1C) (925)988-9600 <br /> V„W Analytical FAX(925)988-9673 <br /> Pinnacle/IT Project: Arco <br /> 2201 Broadway Suite 101 Project Number: Arco#6080,Lathrop Reported: <br /> Oakland CA,94612 Project Manager: Joel Coffman 14-Sep-99 10:28 <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 9I09002: Prepared 09-Sep-99 Using EPA 3050B <br /> Blank(9I09002-BLK1) <br /> Lead ND 0.500 mg/kg <br /> LCS(9I09002-BSI) <br /> Lead 50.0 0.500 mg/kg 50.0 100 80-120 <br /> LCS Dup(9I09002-BSD1) <br /> Lead 50.0 0.500 mg/kg 50.0 100 80-120 0 20 <br /> Matrix Spike(9I09002-MS1) Source:W909148-011 <br /> Lead 105 0.500 mg/kg 50.0 55.0 100 80-120 <br /> Matrix Spike Dup(9I09002-MSD1) Source:W909148-0IIA <br /> Lead 90.0 0.500 mg/kg 50.0 55.0 70.0 80-120 15.4 20 Q-01 <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 /> Dimple Sharma,Project Manager Page 9 of 10 <br />