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Ryegrass Limited Purpose Landfill and Balefill Closed Landfill <br />Groundwater and Leachate Sampling and Analysis Plan <br />Kittitas County Swid Waste <br />information on the quality of the data. The MSD will follow EPA MSD guidelines specified in SW-846 <br />(EPA 2018). <br />2.6 2.,5 Nl itrix 1),iPiic-ate <br />A minimum of one laboratory matrix duplicate will be analyzed per 20 samples, or one per sampling <br />batch (whichever is greater) when samples are analyzed for metals or conventional parameter to <br />provide information on the precision of chemical analysis. The matrix duplicate will follow EPA <br />duplicate guidelines specified in SW-846 (EPA 2018). <br />2. F - 3 Data Verification and Validation <br />Data evaluation will include checking holding times, method blank results, surrogate recovery <br />results, field and laboratory duplicate results, completeness, detection limits, LC5 results, and Chain - <br />of -Custody forms. After the data have been checked, results will be entered into the project database <br />with any assigned data qualifiers. The Project QA Officer will review the following: <br />■ Chain -of -custody documentation <br />■ Holding times <br />■ Equipment/trip blank results <br />■ Field duplicate results <br />■ Method blank results <br />A limited review (minimum 10 percent) of the following laboratory QC results will be conducted in <br />accordance with EPA guidance (EPA 2020a, 2020b). <br />P Laboratory MS/MSD and/or matrix duplicate results <br />■ Laboratory surrogate recoveries <br />a Laboratory check SampleS <br />If, based an this limited review, the QC results Indicate potential data quality problems, further <br />evaluations will be conducted. <br />ZB.3.1 Precision <br />Precision measures the mutual agreement among individual measurements of the same property, <br />usually under prescribed similar conditions. QA/QC sample types that measure precision Include <br />field duplicates, MSD, and matrix duplicates. The estimate of precision of duplicate measurements is <br />expressed as a Relative Percent Difference (RPD), which is calculated: <br />RPD = Di- Dz x 100 <br />(Di + Dz) t 2 <br />Where D1= First sample value <br />D2 = Second sample value. <br />The RPDs will be routinely calculated and evaluated in accordance with EPA guidance (EPA <br />2020a, b). <br />April 2024 1553-1763-010 2-10 <br />Revised May 2024 <br />