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, <br /> wic <br /> 3� <br /> _c <br /> e <br /> E1VYlRCH�fFNL1i <br /> CHUXAL ANAIM . LABORATORIES, INC. <br /> PE7rdOLFUif J.J.EGLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE RD., BAKERSFIELD,CALIFORNIA 93306 PHONE 327-4911 <br /> BTX/TW GASOLINE <br /> Quality Control Data <br /> Dams and Moore Spike ID: 7622-8 <br /> 9300 Tech Center Dr. Ste. 100 Analysis Date: 30-Sep-69 <br /> Sacramento, CA 95828 Sample Matrix: Soil <br /> Attention: Duane Balch Units. ug/g <br /> Quality Control <br /> for Lab Nos: 7622-1, 7622-2, 7622-3, 7622-4, 7622-5, <br /> 7622-6, 7622-7, 7622-8, 7622--9, 7622-10, <br /> - 7622-11, 7622-12, 7622-13, 7622-14, 7622-15, <br /> One saucple in twenty is selected as a representativq, 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 t:b <br /> analysis. <br /> Canc. Conc. Dup <br /> in Spike Added to Spike Spike Spike <br /> Constituent Sample Spike % Rec % Rec RPD <br /> Benzene 0.00 5.01 89.60 90.47 0.97 <br /> Toluene 0.00 5.03 95.02 99.76 4.87 <br /> Etlwl Benzene 0.00 5.09 87.99 92.79 5.31 <br /> p-]yiene 0.00 5.02 90.26 95.41 5.55 <br /> ` nr-Xylene 0.00 5.11 93.90 96.74 5.02 <br /> 0-Xylene 0.00 5.03 92.55 96.86 4.55 <br /> TPH Gas 0.00 301.06 90.71 95.58 5.23 <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 />