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ENVIRONMENTAL <br /> CHEMICALANALYSISLABORATORIES, INC. <br /> PETROLEUM J.J.EGLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> BTX/TPH DIESEL <br /> Quality Control Data <br /> Water Work BTX Spike ID: 9177-1 <br /> 1710 Main St TPH Spike ID: 9294-1 <br /> Escalon, CA 95320 Analysis Date: 27-Nov-89 <br /> Attention: Units: ug/g <br /> Quality Control <br /> for Lab Nos: 9294-1, 9294-2 <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 RPD <br /> -------------------------------------------------------------------- <br /> Benzene 0.00 5.02 91.08 91.71 0.69 <br /> Toluene 0.00 5.16 95.33 94.50 0.87 <br /> Ethyl Benzene 0.00 5.01 94.16 85.01 10.21 <br /> p-Xylene 0.00 5.06 98.44 99.70 1.27 <br /> rO--Xylene 0.00 5.01 102.46 105.49 2.91 <br /> o-Xylene 0.00 5.00 100.50 109.43 8.51 <br /> TPH Diesel 0.00 100.01 93.97 93.58 0.42 <br /> QC Corrnents: <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 Cone. <br /> ---------------------------------------------------- X 100 <br /> (Average Concentration of Spikes) <br />