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ENVIRONMENTAL <br /> CHEMICAL ANALYSIS = L,A g O RATO <br /> RIES, I N.C. <br /> PETROLEUM J.J.EGLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> 4 <br /> r- <br /> BTX/TPH GASOLINE <br /> Quality Control Data <br /> Water Work Spike ID: 8283-1 <br /> 1710 Main St Analysis Date: 26-Oct-89 <br /> Escalon, CA 95320 Sample Matrix: Soil <br /> Attention: Robert Juncal Units: ug/g <br /> Quality control <br /> for Lab Nos: 8283-1 <br /> I_ <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 Se Spm <br /> Constituent SampleSpike % Rec % Rec RPD <br /> -- - <br /> Benzene 0.00 5.02 89.61 85.03 5.25 <br /> 1 Toluene <br /> 0.00 5.16 94.88 84.77 11.26 <br /> Ethyl Benzene 0.00 5.01 92.98 87.58 5.98 <br /> p-Xylene 0.00 5.06 93.83 89.13 5.14 <br /> m-Xylene 0.00 5.01 96.85 91.61 5.56 <br /> o-Xylene 0.00 5.00 94.44 84.02 11.68 <br /> TPH Gas 0.00 301.06 87.17 88.76 1.81 <br /> QC Comments: <br /> Spiked Sample Concentration- Sample Concentration <br /> % Recovery = -------------------------------------------------- X 100 <br /> ----------- <br /> (Concentration of Spike) <br /> RPD (Relative Percent Difference) <br /> Sped Sample Conc. - Spiked Duplicate Sample Conc. <br /> ------------------- X 100 <br /> --------------------- <br /> (Average Conc. of Spikes) <br />