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Ryegrass LPL and Ryegrass Balefill Landfill Upgradient Groundwater <br />Investigation <br />Kittitas County Solid Waste <br />5. Water Quality Analysis <br />Water quality sampling of the new well will be accomplished following the updated Sampling and <br />Analysis Plan (Appendix B). The new well will be representative of conditions upgradient of both the <br />Balefill Landfill and LPL. Wells B3, B7, B8 and spring of Clerf #4 will be analyzed for WAC 137-350- <br />500 parameters on a quarterly basis. B2, B3, B4, B6, and Poison Spring will be analyzed for WAC <br />173-351-430 and WAC 173-351-990 Appendix I and Appendix II parameters on a semi-annual <br />basis. B8 will be analyzed quarterly for the WAC-173-351 parameters until eight quarters have been <br />completed then monitoring will be reduced to semi-annually. <br />The water quality samples will be submitted to an analytical laboratory for all parameters except <br />those collected in the field which include temperature, conductivity, pH, dissolved oxygen, oxidation- <br />reduction potential, and turbidity. Water quality from the initial sampling event will be compared to <br />the existing monitoring wells and summarized in the installation report. <br />Following eight quarters (2 years) of data collection, the data from B8 will be evaluated for statistical <br />analysis to assess whether interwell comparisons are suitable for the Facility. Currently data from the <br />Facility is analyzed by intrawell comparisons to background data (i.e. well data are compared to their <br />own historical data). The statistical parameters for upper prediction limits and control charts were <br />calculated for the 2023 annual report. Monitoring well B8 will likely be installed following the 2nd <br />quarter of 2024 indicating the first re-evaluation usingthe new well could be completed in the 2026 <br />annual report (due April 1, 2027). <br />6. Reporting <br />A summary well installation report will be completed documenting the results of the investigation. <br />The well drilling report will include the following: <br />■ Well Drilling and Construction Logs <br />■ Well Development and Testing Results <br />■ Well Survey Information <br />■ Investigative Derived Waste disposal details <br />■ Field notes and other observations <br />■ Any deviations from this work plan <br />■ Geochemical evaluation, including cation -anion balancing and trilinear and/or stiff diagrams <br />comparing water chemistry between wells. <br />■ Groundwater monitoring laboratory and field data. <br />■ Updated groundwater gradients and contour maps <br />■ Recommendations <br />April 2024 1 553-17 63-010 <br />Revised May 2024 <br />