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OIT am**-ifta <br />Analytical Laboratory <br />3935 N. Comnado Ave. Stockton CA. 95204 Phone: (209) 4774105 <br />CERTIFICATE OF ANALYSIS <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 Order No.: <br />Conventional Chemistry Parameters by APHA/EPA Methods - Quality Control <br />Analyte Result <br />Reporting <br />Limit Units <br />Spike <br />Level <br />Source <br />Result %R OC RPD Notes <br />Matrix Spike (AC22107-MS1) <br />Total Kjeldahl Nitrogen 7.74 0.600 mg/L 10.0 0.495 72 <br />Matrix Spike Dup (AC22107-MSD1) <br />Total Kjeldahl Nitrogen 7.71 0.600 mg/L 10.0 0.495 72 0.4 <br />Blank (AC22122i-BLIC1) <br />Magnesium ND 1.50 mg/L <br />Sodium ND 2.00 <br />I,CS (AC22122-BS1) <br />Magnesium 25.1 1.50 mg 1. 25.0 100 <br />Sodium 25.0 2.00 „ 25.0 100 <br />LCS Dup (AC22122-BSD1) <br />Magnesium 24.3 1.50 mg/L 25.0 97 3 <br />Sodium 24.3 2.00 25.0 97 3 <br />Matrix Spike (AC22122-MS1 <br />Magnesium 28.6 (.5(1 mg/L 25.0 3.98 99 <br />Sodium 37.1 2.0(1 25.0 12.8 97 <br />Matrix Spike Dup (AC22122-MSD1) <br />Magnesium 28.7 1.50 mg/L 25.0 3.98 99 0.3 Sodium 37.0 2.00 25.0 12.8 97 0.3 <br />Reference (AC22122-SRMO <br />Magnesium 41.0 1.50 mg/L 40,0 103 <br />Sodium 40.1 2.00 40.0 100 <br />Precision Enviro-Tech. <> California ELAP Cert. #2387 <br />Page 7 of 10