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0 • <br /> PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Tuesday,April 12,2005 <br /> Attention: Francis X. Bean <br /> Kleinfelder, Inc. Report Page 32 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 /> 1,11alyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch AD51115-CA WET-Title 22(DI) <br /> Blank(AD51115-BLK1) Prepared&Analyzed:11-Apr-05 <br /> Hexavalent Chromium ND 0.10 mg/kg <br /> LCS(AD51115-BS1) Prepared&Analyzed:11-Apr-05 <br /> Hexavalent Chromium 0.242 0.10 mg/kg 0.250 97 80-120 <br /> Matrix Spike(AD51115-MS1) Source:5041107-01 Prepared&Analyzed:11-Apr-05 <br /> Hexavalent Chromium 0.240 0.10 mg/kg 0.250 ND 96 75-125 <br /> Matrix Spike Dup(AD51115-MSD1) Source:5041107-01 Prepared&Analyzed:11-Apr-05 <br /> Hexavalent Chromium 0.235 0.10 mg/kg 0.250 ND 94 75-125 2 20 <br /> mg'L=milligrams per Liter=ppm DLR=Defection Limit for Purpose of Reporting. <br /> ug,L=micrograms per Lifer=ppb Exceptional sample matrices or interferences may <br /> result in higher defection limits. <br /> RESPECTFULLY SUBMITTED, <br /> Jonathan Le,Laboratory Director <br /> 7743 N. West Latae. Suite B2 Stockton CA. 95210 nhotte: (209) 4-7-8105 Fax: (209)4'17-8148 <br />