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El r <br /> o superior Precision Analytical, Inc. <br /> '„ 1555 Burke, Unit I - San Francisco, California 94124 ■ (4 15) 647-.2081 /fax (41 5) 821-7123 <br /> Oil and Grease by EPA Method 5520F <br /> Quality Assurance and Control. Data - Soil <br /> Laboratory Number 14810 <br /> Method Spike <br /> Compound Blank RL Recovery Limits RPD <br /> (mg/kg) . (mg/kg) M M M <br /> f . <br /> Oil and Grease: ND<50 50 68/64 47-97 6% <br /> x <br /> I <br /> Definitions : <br /> ND =' Not Detected <br /> RPD = Relative Percent Difference . <br /> RL = Reporting Limit <br /> mg/kg = Parts per million (ppm) Senior Chemist <br /> QC File No. 14810 Account Manager <br /> Page 3 of 3 <br /> Certified Laboratories <br />