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. µ <br /> a <br /> 5iF <br /> h� <br /> fHVWbAYF17,EL <br /> Fx. <br /> OVUMAMLrus � LABORATORIES, INC. <br /> Pf�AOLfFY J.J.EaLIN,REG.CHEM.ENGR. <br /> 4100 PIERCE R9., BAKERSFIELD,CALIFORNIA 93308 PHONE 33:4911 <br /> TPH DIESEL <br /> Quality Control Data <br /> Dames and Moore <br /> 1-� 9300 Tech Centex Dr. Ste. 100 TPH Spike Iv: 7681-1 <br /> Sacrarrrento, CA 95828 Analysis Date: 03-oct-89 <br /> I ' Attention: Duane Balch Units: uglg <br /> Quality Control <br /> I + 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 /> J" 7622-11, 7622-12, 7622-13, 7622-14, .71322-15, <br /> One sample in twenty is selected as a representative roatrix which is <br /> spiked. Phe percentage recovery (; Pec) of the spike is a relative <br /> measure of the accuracy of the ana Isis. The =nparison of the spike <br /> with a duplicate spike is a measure of the relative precision of the <br /> I'•., analysis. <br /> Conc. Conc. Dup <br /> �» in Spike Added to Spike Spike Spike <br /> Constituent Sample Spike N Rec Rec RPU <br /> T -----------------------------------------.•--------------------------- <br /> Ew <br /> -r TPH Diesel 0.00 100.01 105.20 104.19 0.96 <br /> i <br /> QC Cormients: <br /> Spiked Sample Cr=entration Swple Concentration <br /> % Recovery = -------------------------------------------------- X 100 <br /> (Concentration of Spike) <br /> RPU (Relative Percent Difference) _ <br /> -" Spiked Sample Conc. - Spiked Duplicate Sample Conc. <br /> -----------(Avera e Concentration <br /> X NO <br /> g Concentration of Spikes) <br />