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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 19 of 26 <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 AD51909-EPA 3050B <br /> Blank(AD51909-BLKI) Prepared&Analyzed: 19-Apr-05 <br /> Cadmium ND 0.00200 mg/kg <br /> Chromium ND 0.0100 <br /> Nickel ND 0.500 " <br /> Lead ND 0.0100 " <br /> Zinc ND 0.0100 " <br /> LCS(AD51909-BSI) Prepared&Analyzed: 19-Apr-05 <br /> Lead 0.503 0.0100 mg/kg 0.500 101 80-120 <br /> Zinc 0.510 0.0100 0.500 102 80-120 <br /> Nickel 0.507 0.500 0.500 101 80-120 <br /> Chromium 0.502 0.0100 0.500 100 80-120 <br /> Cadmium 0.505 0.00200 0.500 101 80-120 <br /> Matrix Spike(AD51909-MS1) Source:5041812-01 Prepared&Analyzed: 19-Apr-05 <br /> Nickel 53.1 0.500 mg/kg 40.0 18.8 86 75-125 <br /> Lead 56.4 0.500 40.0 20,8 89 75-125 <br /> Chromium 55.0 0.500 40.0 16.8 96 75-125 <br /> Zinc 69.5 0.500 40.0 37.9 79 75-125 <br /> Cadmium 41.8 0.100 40.0 0.100 104 75-125 <br /> Matrix Spike Dup(AD51909-MSDI) Source:5041812-01 Prepared&Analyzed: 19-Apr-05 <br /> Chromium 49.0 0.500 mg/kg 40.0 16.8 80 75-125 12 20 <br /> Nickel 50.0 0.500 40.0 18.8 78 75-125 6 20 <br /> Lead 50.8 0.500 40.0 20.8 75 75-125 10 20 <br /> Zinc 70.0 0.500 40.0 37.9 80 75-125 0.7 20 <br /> Cadmium 35.0 0.100 40.0 0.100 87 75-125 18 20 <br /> mg/L=milligrams per Liter=ppm DLR=Defection Limit for purpose of Reporting. <br /> ug/L=micrograms per Liter=ppb Exceptional sample matrices or interferences may <br /> result in higher detection limils. <br /> RESPECTFULLY SUBMITTED, <br /> Jonathan Le,Laboratory Director <br /> 7743 N. West Lane. Shite B2 Stockton C-4. 95210 phone: (209) 477-8105 Fax: 13091 477-8148 <br />