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ME <br /> �_� ; <br /> w <br /> A <br /> ENW'RONMENTAL <br /> CHEMICAL.ANALYSIS v LABORATORIES, INC. <br /> J.J.EGLIN.REG.CHEM.EMGR. <br /> ^ PETROLfi1N <br /> 4100 PIERCE RD., BAKERSFIELD, CALIFORNIA 93308 F�40NE 327-4911 <br /> BTX/TPH GASOL?NE <br /> Quality Control Data <br /> Water Work Spike YD: 9419-2 <br /> 1730 Main St Analysis Date: 28-.Nov--89 <br /> Escalon, CA 95320 Sample Matrix: Soil <br /> Attenticn: Robert Juneau- Units. ug/g <br /> `A duality Control <br /> for Lab Nos: 9177-6, 9177-8 <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 /> i ; <br /> Conc. Conc. Dup <br /> in Spike. Added to Spike Spike Spike <br /> Constituent le Spike l Rec % Rec RPD <br /> ..- ---------------- �---- ------------------ _-------- .. - - <br /> Benzene 0.00 5.02 106.72 104.12 2:47. <br /> Toluene 0.00 5.16 102.79 100.28 2.47 <br /> Ethyl Benzene 0.00 5.01 106.197 104.20 2.62 <br /> p-Xylene 0.00 5.06 ` 105.04 102.54 2.41 <br /> rD--Xylene 0.00 5.01 109.47 106.70 2.56 <br /> t. <br /> o-Xylene 0.00 5.00 `108.97 106.45 2.34 <br /> 1{ �TPH Gas 0.00 301.06 85.27 87.04 2.05 <br /> -- - - QC m <br /> Coments' - - -- - - - - - -- -- - - <br /> Spiked Samrple Concentration Sample Concentration <br /> % .Recovery ------------------------- ----- -------___ __ -_ <br /> X 100 . <br /> (Concentration of Spike). <br /> k <br /> r <br /> RFD (Relative Percent Difference) _ <br /> Spiked Sample Conc. Spiked Duplicate Sample Conc. <br /> X 100 <br /> (Average .Cone. of Spikes) <br />