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680 Chesapeake Drive Redwood C' k 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Cret %94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> 455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical ',551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br /> Pimmacle/ r Project: Arco <br /> 2201 Broadway Suite 101 Project Number: Arco#6080 Reported: <br /> Oakland CA,94612 Project Manager: Joel Coffman 27-Sep-99 16:20 <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 9I27001: Prepared 27-Sep-99 Using EPA 3050B <br /> Blank(9127001-BLKI) <br /> Lead ND 1.0 mg/kg <br /> LCS(9127001-BS1) <br /> Lead 47.0 1.0 mg/kg 50.0 94.0 80-120 <br /> LCS Dup (9127001-BSD1) <br /> Lead 47.5 1.0 mg/kg 50.0 95.0 80-120 1.06 20 <br /> Matrix Spike(9127001-MSI) Source: W909505-01 <br /> Lead 70.0 1.0 mg/kg 50.0 25 90.0 80-120 <br /> Matrix Spike Dup (9127001-MSDI) Source: W909505-01 Q-01,Q-07 <br /> Lead 55.0 1.0 mg/kg 50.0 25 60.0 80-120 24.0 20 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the swnples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety. <br /> oid"MA,a <br /> D1mp a Shhriria,Project Manager Page 5 of 6 <br /> lu <br />