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two <br /> /r ENVIRONMENTAL <br /> CHEMICAL ANALYSIS :COO- LA g p RATO R I ES, INC. <br /> AETROLEYM J.J.EGLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> M%/TFIi DIESEL <br /> Qaality Control Data <br /> Dames and Moore Spike ID: 6095-3 <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 Nos: 6095-3, 6095-5, 6095-6, 6095-27, <br /> 6095-29, 6095-31 <br /> LOne 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 /> LConc. Conc. Dup <br /> in Spike Added to Spike Spike Spike <br /> Constituent Sample Spike % Rec % Rec RPD <br /> -------------------------------------------------------------------- <br /> TPH Diesel 0.00 100.01 109.40 107.18 2.05 <br /> L <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 Sample Conc. <br /> ------------------------------------------------------ X 100 <br /> (Average Concentration of Spikes) <br />