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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Tuesday,April 12,2005 <br /> Attention: Francis X. Bean <br /> Kleinfelder,Inc. <br /> Report Page 31 of 39 <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 AD51114-EPA 3050B <br /> Blank(AD51114-BLKI) Prepared&Analyzed: 11-Apr-05 <br /> Cadmium ND 0.00200 mg/kg <br /> Chromium ND 0.0100 " <br /> Nickel ND 0.500 " <br /> Zinc ND 0.0100 <br /> Lead ND 0.0100 " <br /> LCS(AD51114-BSI) Prepared&Analyzed:11-Apr-05 <br /> Lead 1.01 0.0100 mg/kg 1.00 101 80-120 <br /> Nickel 0.998 0.500 1.00 100 80-120 <br /> Chromium 0.995 0.0100 1.00 100 80-120 <br /> Cadmium 1.00 0.00200 1.00 100 80-120 <br /> Zinc 1.00 0.0100 1.00 100 80-120 <br /> Matrix Spike(AD51114-MSI) Source:5041107-05 Prepared&Analyzed:11-Apr-05 <br /> Lead 45.6 0.500 mg/kg 50.0 6.40 78 75-125 <br /> Nickel 59.8 0.500 50.0 22.3 75 75-125 <br /> Zinc 63.7 0.500 50.0 30.6 66 75-125 <br /> Chromium 65.6 0.500 50.0 25.0 81 75-125 <br /> Cadmium 42.0 0.100 50.0 ND 84 75-125 <br /> Matrix Spike Dup(AD51114-MSD1) Source:5041107-05 Prepared&Analyzed:11-Apr-05 <br /> Nickel 60.6 0.500 mg/kg 50.0 22.3 77 75-125 1 20 <br /> Lead 46.3 0.500 50.0 6.40 80 75-125 2 20 <br /> Zinc 64.2 0.500 50.0 30.6 67 75-125 0.8 20 <br /> Chromium 66.7 0.500 50.0 25.0 83 75-125 2 20 <br /> Cadmium 43.2 0.100 50.0 ND 86 75-125 3 20 <br /> mg L=milligrams per Liter=ppm DLR=Detection Limitfor Purpose of Reporting. <br /> ug L=micrograms per Liter=ppb Exceptiomil sample mainces or interferences may <br /> result in higher detection limits. <br /> RESPECTFULLY SUBMITTED, <br /> �j/04' _. <br /> Jonathan Le,Laboratory Director <br /> 7743 N. gest Lane. Suite B2 Stockton CA. 95210 nhone• (209) 47--8105 Fay: (209) 47-7-8148 <br />