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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Wednesday,April 20,2005 <br /> Attention: Doug Heard <br /> Kleinfelder,Inc. Report Page 10 of 16 <br /> 2825 Myrtle St. <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 AD51913-General Prep <br /> Blank(AD51913-BLKI) Prepared&Analyzed: 19-Apr-05 <br /> Hexavalent Chromium ND 0.10 mg/kg <br /> LCS(AD51913-BSI) Prepared&Analyzed: 19-Apr-05 <br /> Hexavalent Chromium 0.0480 0.10 mg/kg 0.0500 96 80-120 <br /> Matrix Spike(AD51913-MSI) Source:5041907-01 Prepared&Analyzed: 19-Apr-05 <br /> Hexavalent Chromium 0.0500 0.10 mg/kg 0.0500 ND 100 75-125 <br /> Matrix Spike Dup(AD51913-MSD1) Source:5041907-01 Prepared&Analyzed: 19-Apr-05 <br /> Hexavalent Chromium 0.0500 0.10 mg/kg 0.0500 ND 100 75-125 0 20 <br /> mg/L—milligrams per Liter=ppm DLR=Detection Limitfor 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 /> ''43 N. [Fest Lane. Suite B2 Stockton CA .952.10 phone: (209) 477-8105 Fax: (20.9) 477-8148 <br />