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ENVIRONMENTAL _ <br /> CHEMICAL ANALYSIS - LABORATORIES, INC. <br /> PETROLEUM J.J.EGLIN. REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> BTX/TPH GASOLINE <br /> Quality Control Data <br /> Water Work Spike ID: 8218-1 <br /> 1710 Main St Analysis Date: 18-Oct-89 <br /> Escalon, CA 95320 Sample Matrix: Soil <br /> Attention: Robert Juncal Units: ug/g <br /> Quality Control <br /> for Lab Nos: 8121-1, 8121-2, 8121-3, 8121-4, 3121-5 <br /> 8121-6, 3121-7, 8121-8, 8191-9 <br /> One sample in twenty is selected as .a representative iRatrix 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 90.35 91.62 0.84 <br /> Toluene 0.00 5. 16 93.36 93.86 0.53 <br /> Ethyl Benzene 0.00 5.01 97.15 96.29 0.39 <br /> p-Xylene 0.00 5.06 96.22 94.63 1.67 <br /> m-Xylene 0.00 5.01 99.58 99. 17 0.41 <br /> o-Xylene 0.00 5.00 101.23 99.08 2. 15 <br /> TPH Gas 0.00 301.06 105.53 107.01 1.39 <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 /> ----------------------------------------------------- <br /> X 100 <br /> (Average Conc. of Spikes) <br />