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PRECISION <br /> ' EATWRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Wednesday,March 2,2005 <br /> Attention: Francis X. Bean <br /> Kleinfelder,Inc. Report Page 10 of 21 <br /> 2825 East Myrtle Street <br /> Stockton, CA 95205 <br /> ' Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Precision Enviro-Tech <br /> ' Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AC50120-General Prep <br /> Blank(AC50120-BLKI) Prepared&Analyzed:01-Mar-05 <br /> Hexavalent Chromium ND 0.10 mg/kg <br /> 1 <br /> uug/L=milligrams per Lifer=ppm DLR=Detection Limit for Purpose of Reporting. <br /> ug/L=micrograms per Liter=ppb Exceptional sample matrices or interferences may <br /> ' result in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> Jonathan Le,Laboratory Director <br /> 774:1 N. TVest Lane. Shite B2 Stockton CA. 95210 phone: (209) 477-8105 Fax: (209) 477-8148 <br />