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F <br /> ENVIRONMENTAL <br /> i <br /> CHEMICAL ANALYSIS LABORATORIES, INC. i <br /> PETROLEUM J.J.EGLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> i <br /> BTX/TPH DIESEL <br /> Quality Control Data <br /> Dames and Moore Spike ID: 6095-2 <br /> 1320 E. Shaw Ave Ste. 110 Analysis Date: 16-Aug-89 <br /> Fresno, CA 93710 <br /> Attention: Burton Gilpin Units: ug/g <br /> Quality Control <br /> for Lab Fos: 6095-2, 6095-8, 6095-13, 6095-16, 6095-17, <br /> 6095-24, 6095-28, 6095-30, <br /> One sample in twenty is selected as a representative matrix which is <br /> spiked. The percentage recovery (% 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 BPD <br /> -----_------------------------------------------------------------------ <br /> TPH Diesel 0.00 100.01 103.51 107.91 4.16 <br /> QC Comments: <br /> Spiked Sample Concentration - Sample Concentration <br /> % Recovery = --------------------------------------------------- X 100 <br /> (Concentration of Spike) <br /> RPD (Relative Percent Difference) = <br /> Spiked Sample Conc. - Spiked Duplicate <br /> Sample Conc. <br /> ---------------------------------------------------- X 100 <br /> (Average Concentration of Spikes) <br />