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Rf4ISI OR DIVIIRO4K1 <br />Analytical Laboratory <br />3935 N. Corona& Ave, Stockton CA. 95204 Phone: (209) 477-0105 <br />CERTIFICATE OF ANALYSIS <br />[Analyte Result RPD Notes <br /> <br />Reporting Spike Sourcc <br /> <br />Limit Units Level Result %REC <br />Chesney Consulting <br />P. 0. BOX 3794 <br />Turlock, CA 95381 <br />Project Number: Chevron -Thornton <br />Project Name: Chevron -Thornton <br />Project Manager: Don Chesney <br />Work Orticr <br />Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br />Blank (AC21711-BLK1) <br />Biochemical Oxygen Demand <br />Duplicate (AC21711-DUP1) <br />Biochemical Oxygen Demand <br />Reference (AC21711-SRM1) <br />Biochemical Oxygen Demand <br />Duplicate (AC21712-DUP1) <br />Dissolved Oxygen <br />Duplicate (AC21713-DL PI) <br />PH <br />Reference (AC21713-SRM1) <br />pH <br />Duplicate (AC21714-DUP1) <br />Specific Conductance (EC) <br />Reference (AC21714-SRM1) <br />Specific Conductance (EC) <br />ND 2.0 mg L <br />3800 2 () mg L. 4000 6 <br />200 2.0 mg/L. 198 99 <br />2.88 0.10 mg/L. 2.89 0.3 <br />7.70 0.0100 pH Units 7.70 0.01 <br />7.00 0.0 I 00 p11 Units 7.00 100 <br />613 1.00 um hos/cm 614 0.2 <br />101 1.00 umhos/cm 102 100 <br />Precision Enviro-Tech. California ELAP Cert. #2387 <br />Page 4 of 10