2025-03-11-minutes-solid-waste-and-maintenance

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Ryegrass Limited Purpose Landfill and Balefill Closed Landfill Groundwater and Leachate Sampling and Analysis Plan Kittitas County Solid Waste The Balefill Landfill was originally permitted and operated under Chapter 173-304 WAC from 1980 to 1997. The Balefill Landfill closed in 2005 under Chapter 173-351 WAC under the 1998 Agreed Order (Ecology 1998, 2012). The Balefill Landfill accepted compressed baled MSW waste from the Ellensburg Transfer Station and Baler Plant. Additionally, yard waste, construction debris, and automotive tires were placed in the landfill. 1.4 History of Groundwater Monitoring Groundwater monitoring at the Facility started in 1993. Three monitoring wells, B2, B3, and B4, were installed south of the Balefill Landfill. A fourth location, B1, was abandoned and a well was not constructed due to limited groundwater accumulation in the open borehole (PGG 1991). Well B2 includes shallow and deep completions. The shallow completion is 38 feet deep and dry. In 2000, additional wells B5 and B6 were added further south of the Balefill Landfill as part of the RI/FS. In 2004, B7 was added located west of the LPL following re -permitting of the CDL landfill into an LPL. There are several nearby springs of groundwater discharging to surface water where the Vantage Interbed and bottom Gingko Flow zone outcrop at land surface in the nearby shallow channels. This includes Upper Clerf, Lower Clerf, Clerf #3, Clerf #4, and Poison Spring (Figure 2). Monitoring for the LPL is completed quarterly at monitoring wells B3 and B7 and the Clerf #4 spring in accordance with WAC 173-350-400 and the SAP (HWA 2020). Monitoring for the Balefill Landfill is completed at wells B2 (deep), B3, B4, B5, and B6 and Poison Spring on a semi-annual basis in accordance with the Post -Closure Monitoring Plan (HWA 2018). The Post -Closure Monitoring Plan called for quarterly monitoring but in 2018, post -closure monitoring of the Balefill Landfill was reduced to semi-annually (HWA 2018). Figure 3 displays the location of the monitoring wells and spring sampling points. Monitoring well logs are attached in Appendix A. Photographs of the spring outlets are also attached in Appendix A. Monitoring well logs are attached in Appendix A. 1.5 History of Leachate Monitoring In accordance with the AO, the engineered leachate collection and treatment system conveys leachate from the Balefill Landfill up to the easternmost lined leachate pond (Figure 2). Leachate has not been historically sampled except for prior to the development of the system. Leachate was sampled in 2023 (Parametrix 2024). 1.6 Project Organization Individuals responsible for ensuring the quality of the field operations and the collection of data are identified in this section. Parametrix on behalf of Kittitas County will provide oversight of all project activities and will be the point of contact with KCPHD and Ecology. Sampling activities, data evaluation, and reporting will be performed by Kittitas County or their consultants. Laboratory analysis will be done by Ecology -certified laboratories. April 2024 1 553-1763-010 1-3 Revised May 2024