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i <br /> fXVlAOk11EM.1 i <br /> CHMAL ANAUSS a LABORATORIES, INC. <br /> PE79.%EVM J.J.EGLIN.REG.CHEM.ENGR. <br /> _ 4100 PIERCE RD., BAKERSFIELD,CALIFORNIA 93308 PHONE 327-4911 <br /> BTX/TPH GA.SOLIN'R <br /> -- Quality Control Data <br /> Mmes and Moore Spike ID: 7601-8 <br /> _ 9300 Tech Centar Dr. Ste. 100 Analysis Date: 30-Sep-89 <br /> Sacramento, CA 95828 Sample lutrix: Soil <br /> Attention: Duane Balch Units: ug/g <br /> Quality Control <br /> for Lab Nos: 7622-21, 7622-22, 7622-23, 7622-24 <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 /> Cone. Conc. Dup <br /> in Spike Added to Spike Spike Spike <br /> Constituent Sample Spike % Rec % Rec RPD <br /> Benzene 0.00 5.01 96.65 96.43 0.23 <br /> Toluene 0.00 5.03 105.66 105.27 0.56 <br /> Ethyl Benzene 0.00 5.09 97.42 96.15 1.31. <br /> p--Xylene 0.00 5.02 100.70 99.08 1.62 <br /> m-Xylene 0.00 5.11 103.75 102.31 1.40 <br /> 1 <br /> o-Xylene 0.00 5.03 103.07 104.01 0.91 <br /> TPH Gas 0.00 301.06 99.43 94.16 5.44 <br /> QC Coments: <br /> Spiked Sample Concentration - Sample Concentration <br /> °6 Recovery ---------------------- _------------------------- X 100 <br /> (Concentration of Spike) <br /> I <br /> RFD (Relative Percent Difference) = <br /> :- Spiked Smmple Conc. - Spiked Duplicate Sample Conc. <br /> ------------------------------------------------------ X 100 <br /> (Average Conc. of Spikes) <br />