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QUALITY ASSURANCE SUMMARY <br /> (Duplicates Analyses) <br /> Site: Skinrise & Lodi Landfills <br /> P.O. E-0052-70-1061-01-B & E005.0 70Y87010 <br /> ERT Project E537-306 <br /> M&A Project 70106101-5 & 70Y87010 <br /> well Gas Samples <br /> Date Received: March 3, 1988. <br /> Date Analyzed: March 4, 1,988 <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 77-85,5 77.774 0.10 <br /> Oxygen 1.256 1.258 1.257 0.080 <br /> ."n .21.834 2.1 21.854.874 0.`092 <br /> Carbon Dioxide 1.978 2.023 2.000 1.1 <br /> 15.427 15,.423 15.425 0.013 <br /> -Methane 2.4149 2.128, 2. 138 0.49 <br /> AND& <br /> (Concentration in ppb) <br /> 1. Benzene <500 <500 --- --- <br /> Vinyl Chloride <500 <500 <br /> Oichloromethane .<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 /> A set of 2 samples, laboratory numbers 80638 was <br /> analyzed for Calderon components. Agreement between duplicate <br /> analyses is a measure of precision and is shown above in the <br /> column 11% 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 sot of 2 well gas samples is 0. 28 <br />