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ENV/RONNENTAL <br /> CHEMICAL ANALYSIS : LABORATORIES, INC. <br /> r <br /> PETROLEUM J.J.EGLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> BTX/TP'H GASOLINE <br /> r Quality Control Data <br /> I i <br /> Water Work Spike ID: 8283-5 ! <br /> 1710 Main St Analysis Date: 24-Oct-89 <br /> j Escalon, CA 95320 Sample Matrix: Soil <br /> I Attention: Robert Juncal its: ug/g <br /> Quality Control <br /> " for Lab Nos: 8283-2, 8283-3, 8283-4, 8283-5, 8283-6, 8283-7 <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 j <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 RTD <br /> L -------------------------------------------------------------------- <br /> Benzene 0.00 5.02 84.20 85.94 2.05 <br /> " r <br /> Toluene 0.00 5.16 89.98 91.52 1.70 <br /> i <br /> Ethyl Benzene 0.00 5.01 95.56 96.41 0.89 <br /> p-Xylene 0.00 5.06 94.86 95.37 0.54 <br /> m-Xylene 0.00 5.01 99.34 99.60 0.26 <br /> L <br /> j <br /> o-Xylene 0.00 5.00 96.63 97.58 0.98 <br /> I <br /> TPH Gas 0.00 301.06 92.46 85.81 7.46 <br /> j QC Comments: <br /> Spiked Sample Concentration - <br /> Sample-Concentration <br /> % Recovery = ---------------------------------- X 100 <br /> j� (Concentration of Spike) <br /> l <br /> RPD (Relative Percent Difference) = <br /> Spiked Sample Conc. - Spiked Duplicate Sample Conc. <br /> --------------------- X 100 ' <br /> (Average' Conc. of Spikes) <br />