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f <br /> -A <br /> ENVIRONMENTAL <br /> CHE ICI ANALYSIS LABORATORIES, INC. <br /> -� PETROLEUM J.J.EGLIN.REG.CHEM.ENGA, <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 PHONE 327-4911 <br /> BTX/TPH GASOLINE <br /> Quality Gantrol Data <br /> Water Work Spike ID: 91.77-1 <br /> 1710 Main St Analysis Date: 28-Nov-89 <br /> Escalon, CA 95320 Sample Matrix: Soil <br /> Attention: Robert Juncal Units: ug/g <br /> Quality Control <br /> for Lab Nos: 9177-1, 9177--2, 9177-3, 9177-7 <br /> Cme 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 /> Cono. Conc. Dup <br /> y in Spike Added to Spike Spike Spike <br /> ti Constituent Sample Spike % Rec % Rec RPD <br /> ------------------------------------------------------------------- <br /> x.r <br /> Benzene 0.00 5.42 91.08 91.71 0:69 <br /> Toluene 0.00 5.16 95.33 94.50 0.87 <br /> I , <br /> Ethyl Benzene 0.00 5.61 94.16 85.01 10.21 <br /> p-Xylene 0.00 5.06 98.44 99.70 1.27 <br /> m--Xylene 0.00 5.01 102,46 105.49 2.91 <br /> o-Xylene 0.00 5.00. 200.50 109.43 8.51 <br /> TPH Gas 0.00 301.46 93.17 84.82 9.38 <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 Conc. of Spikes) <br />