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PRECISION <br /> ENVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OF ANALYSIS <br /> Tuesday,April 19, 2005 <br /> Attention: Doug Heard <br /> Kleinfelder, Inc. Report Page 11 of 17 <br /> 2825 Myrtle St. <br /> Stockton, CA 95205 <br /> Polychlorinated Biphenyls by EPA Method 8082-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 AD51914-Solvent Extractions <br /> Blank(AD51914-BLKl) Prepared&Analyzed: 19-Apr-05 <br /> PCB-1016 ND 33.0 ug/kg <br /> PCB-1221 ND 33.0 " <br /> PCB-1232 ND 33.0 " <br /> PCB-1242 ND 33.0 " <br /> PCB-1248 ND 33.0 " <br /> PCB-1254 ND 33.0 " <br /> PCB-1260 ND 33.0 " <br /> Surrogate:Decachlorobiphenyl(DCB) 30.0 33.3 90 65-135 <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 /> Jonathan Le,Laboratory Director <br /> �?43 N. I'Vest Lane. Shite 1.32 Stockton CA. 95210 phone: (209) 477-8105 FaA (209) 4 7?-8148 <br />