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FF k <br /> AGR,711lIVRf <br /> CNIMICAIANAIWS ® LABOR TC 7RIES, In.C. <br /> /fTkPlIUAI J.J.MAIN.REG.CHEM.ENGIL <br /> �. 4100 PIERCE ND., BAKERSFIELD,CALIFORNIA 93308 PHONE 327-4911 <br /> TPri DIESEL <br /> �» (Water) <br /> Quality Control Data <br /> Dames and Moore <br /> 9300 Tech Center Dr 7.04 Spike ID: 7987-1 <br /> Sacramento, CA 95826 Analysts Date: 12-Out-89 <br /> Attention: Duane Balch Units. ug/t, <br /> Quality Control <br /> .for Fab Nos: 7687-1 <br /> F One sample in twenty is selected ;�-s a representative matrix which is <br /> spiked. The percentage recovery (% Rec) of the spike is a relative <br /> mPasure of the ,accuracy of the analysis. The comparison of the spike <br /> w=th a duplicate spike is a measure of the relative precision of the: <br /> ana]ys,s. <br /> Cone. Cent. Dup <br /> in Spike Added to Spike Spike Spike <br /> Constituent Sample Spike % Rec % F.3c RPD <br /> TPH Diesel 0.00 100.01 99.24 107.29 7.80 <br /> _ QC Comments: p, <br /> Spiked Sample Concentration - Sample Concentration <br /> % Recovery = -------------------------------------------------- X 100 <br /> (Concentration of Spike) <br /> I' RED (Relative Percent Difference) = <br /> Spiked Sample Conc. - Spiked Duplicate Sample Conc. <br /> _LL X 100 <br /> (Average Concentration of Spikes) <br />