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

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Ryegrass LPL and Ryegrass Balefill Landfill Upgradient Groundwater Investigation Kiltitas County Solid Wmia I . Introduction This report presents the work plan for completion of one new monitoring well at the Kittitas County (County) Ryegrass Facility (Facility) in 2024, Kittitas County Solid Waste owns and operates the Ryegrass Limited Purpose Landfill (LPL) and performs post -closure care of the Ryegrass Balefill Municipal Solid Waste (MSW) Landfill (Balefill Landfill) located in Kittitas County, Washington. The Facility is addressed at 25900 Vantage Highway in Ellensburg, Kittitas County, Washington. Figure 1 displays the location of the Facility, including the LPL, Balefill Landfill, leachate evaporation ponds, leachate pump station, liquid waste evaporation lagoons (LWELs) and biosolids land application fields, The Facility Is within Section 16 of Township 17 North Range 21 East. Figure 2 displays the details of the Facility. The work plan outlined in this technical memorandum is to drill and construct one new monitoring well, B8, upgradient of both the LPL and the Balefill Landfill (Figure 3). 2, Background 2A Facility Description The Facility encompasses 640 acres of land located within Section 16 of Township 17 North, Range 21 East on Kittitas County parcel identification numbers 040833 and 956102 (Figure 1). The Facility is accessed from a paved roadway off Vantage Highway north of the Facility. The facility includes the active 13.5-acre LPL, the closed 27-acre Balefill Landfill, a leachate pump station, two lined 500,000-gallon leachate evaporation ponds, two lined 500,000-gallon LWELS, and biosolids land application fields. The surrounding area is predominantly vacant arid land. The Wild Horses Wind and Solar Facility office building is located approximately 3,500 feet north of the LPL. The nearest residential structures are located approximately 4,600 feet east of the LPL. The LWELs and leachate evaporation ponds are located on the northern portion of the Facility (Figure 2). The LPL is located west of the lagoons and the Balefill Landfill is located south of the LWELs and leachate evaporation ponds (Figure 2). Leachate from the Balefill Landfill is collected at two locations, conveyed by gravity to the leachate pump station, and pumped up to the leachate evaporation ponds (Figure 2). 2.2 Site History 2.2.1 Ryegrass BalefW Landfill The Balefill Landfill, also referred to by the Washington State Department of Ecology (Ecology) as the Ryegrass Landfill (Ecology 1998), is a closed MSW landfill that was originally permitted and operated under Chapter 173-304 WAC from 1980 to 1997. The landfill received compressed bales of MSW from the Ellensburg Transfer Station and Baler plant. The bales, yard waste, construction debris, and tires were placed in the landfill. From 1983 to 1988, dally cover consisted of a mixture of native soil mined from the Facility mixed with biosolids. The sail and biosolids mixture was prepared in an area northwest of the Balefill Landfill {just south of the LPL). From 1988 until closure in 1997, daily cover April 2024 1 553.1763-010 Revises! May 2024