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

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Ryegrass LPL and Ryegrass Balefill Landfill Upgradient Groundwater Investigation Kimilas County Solid Wave was mined locally from the Faci city or taken from treated soils from the historical on -site petroleum contaminated soil (PCS) treatment area operated by Taneum Recovery (Figure 2). In 1990, Parametrix developed a plan for three phases of landfilling (Parametrix 1990); however, only portions of Phase 1 and part of Phase 3 were completed. Documents from the 1990 planning show buried asbestos waste is located south of the existing equipment shed. By 1996, active leachate seeps were observed flowing from the southwest and southeast portions of the landfill and sampling showed the presence of several heavy metals including arsenic, antimony, barium, cadmium, chromium, cobalt, cyanide, lead, and manganese. Groundwater was also found with concentrations exceeding Chapter 173-200 WAC criteria for arsenic, chloride, nitrate, and total dissolved sollds (TDS) in downgradient monitoring wells. In 1998, Ecology issued an Agreed Order (AO) for resolution of the leachate seeps, engineered closure of the landfill, and completion of a Remedial Investigation/Feasibility Study (Ri/FS; Ecology 1998). R,W. Beck, Inc. developed the post -closure plan for the Balefill Landfill. Final closure of the Balefill Landfill was completed in 2005 with construction of the leachate collection and treatment system (Figure 3) including the two lined 500,000-gallon leachate evaporation ponds, gas vents, and engineered cover system under Chapter 173-351 WAC and the 1998 AO. HWA completed a RI/FS in 2004 (HWA 2004). In 2012, Ecology issued a notification of satisfaction of the AO (Ecology 2012) citing the completion of the final cover, leachate management, no surface flow, an engineering closure plan, and completion of the RI/FS. 2.2.2 Ryegrass Limited Purpose Landfill The LPL was originally permitted and operated as a construction demolition and land clearing (CDL) debris landfill under Chapter 173-304 WAC from 1996 to 2005. The landfill was re -permitted under Chapter 173-350 WAC in 2005 as an LPL. Records indicate prior to construction of the landfill the area was used for biosolids application (Figure 3). In 1999, it was discovered that soils transferred to the LPL by Taneum Recovery contained untreated PCS. The KCPHD issued a cease -and -desist order to Taneum Recovery and a plan was made to remediate the soil and transfer it back to the PCS treatment facility. This was documented in a closure report (R.W.Beck 1999) and Ecology Issued a No Further Action (NFA) in October 1999. 2.2,3 Other Facility Operations The PCS treatment facility was operated by Taneum Recovery, Inc. Just east of the Balefill Landfill. PCS was treated until below cleanup levels and soils were deposited Into the Balefill Landfill until 1997 then the LPL until 1999. Figure 2 displaysthe approximate location of the historical treatment facility. Much of the topsoil historically up to 2-feet In depth on the northeast portion of the Facility was mined for use as daily cover within the Balefill Landfill. Other areas of the Facility were also mined for rock and materials removing the natural topsoii In some areas. Six historical unlined blosollds lagoons were located on the northern portion of the Facility Upgradient of the landfills. The oldest four were located near the entrance to the Facility (Figure 2), Unlined replacement septage lagoons were constructed just west of the leachate lagoons and operated until 2006. By 2000, the western lined leachate lagoon was being used for biosoiids due to the limited amount of leachate produced from the Balefill Landfill (Figure 2). In 2006, two additional AP01 2024 1553-1763.010 Peviged May 2024