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40 PRECISIO <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OFANALYS <br /> Tuesday,July 12, 2005 <br /> Attention: Doug Heard ' <br /> Kleinfelder, Inc. <br /> 2825 Myrtle St. Report Page 96 of 103 <br /> Stockton, CA 95205 ! <br /> Metals by EPA 6000/7000 Series Methods- Quality Control <br /> Precision Enviro-Tech 1 <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AG51101 -EPA 3050B <br /> Matrix Spike Dup(AG51101-MSDI) Source:5070716-14 Prepared: 11-Jul-05 Analyzed: 12-Jul-05 -A <br /> Barium 612 0.500 mg/kg 50.0 574 76 75-125 0 20 <br /> Chromium 170 0.500 50.0 129 82 75-125 0 20 <br /> Arsenic 60.0 0.500 50.0 11.8 96 75-125 9 20 <br /> Nickel 156 0.500 50.0 118 76 75-125 0 20 ' <br /> Selenium 47.5 0.500 50.0 ND 95 75-125 2 20 <br /> Zinc 184 0.500 50.0 144 80 75-125 0.5 20 <br /> Lead 60.1 0.500 50.0 16.7 87 75-125 4 20 <br /> Cadmium 46.0 0.100 50.0 ND 92 75-125 2 20 1 <br /> Silver 49.0 0.500 50.0 ND 98 75-125 14 20 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> mg/L=milligrams per Liter=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 /> �j/Ot-r� <br /> 1 <br /> Jonathan Le,Laboratory Director <br /> 7743 N. West Lane. Suite B2 Stockton CA. 95210 phone: (209) 477-8105 Fax: (209) 477-8148 1 <br />