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QUALITY ASSURANCE SUMMARY <br /> 1 (Duplicates Analyses) <br /> Site: Sunrise & Lodi Landfills <br /> P.O. # : E-0052-70-1061-01-B & E0050 70Y87010 <br /> ERT Project # : E537-306 <br /> M&A Project # : 70106101-5 & 70Y87010 <br /> Well Gas Samples <br /> E Date Received: March 3 , 1988 <br /> Date Analyzed: March 4 , 1988 <br /> Duplicates Analyses Mean % Diff. <br /> Component Run #1 Run #2 Conc. from Mean <br /> (Concentration, %) <br /> Nitrogen 81. 118 80. 974 81. 046 0. 089 <br /> 77 . 693 77 . 855 77 . 774 0. 10 <br /> Oxygen 1. 256 1. 258 1. 257 0. 080 <br /> 21. 834 21. 874 21. 854 0. 092 <br /> Carbon Dioxide 1.978 2 . 023 2 . 000 1. 1 <br /> I <br /> 15.427 15. 423 15. 425 0. 013 <br /> Methane 2 . 149 2 . 128 2 . 138 0.49 <br /> 1 <br /> (Concentration in ppb) <br /> Benzene <500 <500 --- --- <br /> Vinyl Chloride <500 <500 --- --- <br /> Dichloromethane <60 <60 --- --- <br /> Trichloromethane <2 <2 <br /> 1, 1, 1-trichloro- <10 <10 --- --- <br /> ethane <br /> Tetrachloromethane <5 <5 --- --- <br /> 1, 2-dichloroethane <20 <20 ___ --- <br /> Trichloroethene <10 <10 <br /> Tetrachloroethene <10 <10 --- --- <br /> 1, 2-dibromoethane <1 <1 --- --- <br /> t <br /> A set of 2 samples, laboratory numbers 80638- (1-2) was <br /> analyzed for Calderon components. Agreement between duplicate <br /> analyses is a measure of precision and is shown above in the <br /> column "% Difference from Mean" . Duplicate analyses are an <br /> important part of ERT's quality assurance program. The average <br /> Difference from Mean for 7 duplicate measurements from the <br /> sample set of 2 well gas samples is 0`. 28 % . <br /> 0 <br />