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PRECISION <br /> RNVIRO-TECH <br /> Analytical Laboratory CERTIFICATE OFANALYSIS <br /> Tuesday,March 13, 2007 <br /> Attention: Guy W.Roy <br /> R&L Diesel Report Page 15 of23 <br /> P.0.8ox 2498 <br /> Danville, CA 94526 <br /> Metals by EPA 6000/7000 Series Methods-Quality Control <br /> Precision Enviro Tech <br /> Reporting S pike Source %REC RPD <br /> Analyte Result Limit Units L evel Result %REC Limits RPD Limit Notes <br /> Batch AC70504-General Pre <br /> Blank(AC70504-BLK1) Prepared&Analyzed:05-Mar-07 <br /> Selenium ND 0.0100 mg/kg <br /> Arsenic ND 0.0100 " <br /> Barium ND 0.0100 " <br /> Beryllium ND 0.0100 " <br /> Cadmium ND 0.00200 " <br /> Cobalt ND 0.0100 " <br /> Chromium ND 0.0100 " <br /> Copper ND 0.0100 " <br /> Molybdenum ND 0.0100 " <br /> !Nickel ND 0.500 " <br /> Antimony ND 0.0200 I <br /> Silver ND 0.0100 <br /> Thallium ND 0.0100 " + <br /> Vanadium ND 0.0100 " <br /> Zinc ND 0.0100 f <br /> Lead ND 0.0100 " <br /> LCS(AC70504-BSI) Prep ared&Analyzed:05-Mar-07 <br /> Beryllium 0.978 0.0100 mg/kg 1.DO 98 80-120 <br /> Silver 0.955 0.0100 1. 0 96 80-120 <br /> Barium 0.952 0.0100 1.p0 95 80-120 <br /> Cadmium 0.964 0.00200 1.00 96 80-120 <br /> Cobalt 0.969 0.0100 1.)0 97 80-120 k <br /> Chromium 0.957 0.0100 1. 0 96 80-120 <br /> Copper 0.970 0.0100 1.00 97 80-120 <br /> Molybdenum 0.962 0.0100 1.100 96 80-120 <br /> Lead 0.962 0.0100 1. 0 96 80-120 <br /> Antimony 0.975 0.0200 1. 0 98 80-120 <br /> Selenium 0.993 0.0100 1. 0 99 80-120 <br /> Thallium 0.999 0.0100 1. 0 100 80-120 <br /> Vanadium 0.938 0.0100 1.•0 94 80-120 <br /> Zinc 0.967 0.0100 1. 0 97 80-120 <br /> Nickel 0.969 0.500 1. 0 97 80-120 <br /> Arsenic 0.975 0.0100 1. 0 98 80-120 - <br /> mg/L=milligrams per Liter-ppm DLR=Detection Limit for Purpose afReporting <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 /> 3935 N. Coronado Ave Stockton CA. 95204 phone: (209) 47 -8105 Fax: (209) 477-8148 <br />