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Mr.4"uYSI LABORATORIES, INC. <br /> PP7A0llilY J.J.Er.UN.REa CHEM.ENGR. <br /> 4100 PIERCE RG., BAKERSFIEL 0,CALIFORNIA$3308 PHONE 327-4811 <br /> TPH DIESEF, <br /> Qcality control Data <br /> Dams and Moore <br /> 9300 Tech center Dr. TPH Spike ID: 7622-1 <br /> Sacramento, CA 95826 Analysis Date: 29-Sep-89 <br /> Attention: Duane Balch Units: uglg <br /> Quality Control <br /> for Lab Nos: 7662-1 <br /> One sample in twenty is selected as a representative matrix which is <br /> spiked. The percentage recover, (% Rec) of the spike is a relative <br /> measure of the accuracy of the analysis. The comparison of the spike <br /> with a duplicate spike is a measure of the relative precision of the <br /> analysis. <br /> Conc. Conc. Dup <br /> in Spike Added to Spike Spike Spike <br /> Constituent Sample Spike Rec Rec- RPD <br /> --------------- ------------------------------------------------- <br /> TPF[ Diesel 0.00 100.01 111.81 102.46 8,73 <br /> QC Comments: <br /> Spiked Sample Concentration - <br /> Sample Concentration <br /> Recovery = ------------------------------------------------- X 100 <br /> (Concentration of Spike) <br /> RPD (Relative Percent Difference) = <br /> Spiked Sample Conc. - SpUtel Tk3piivata Sample Cone. <br /> ------------------------------------------------ X 100 <br /> (Average Concentration of Spikes) <br />