2023-09-12-minutes-solid-waste-and-maintenance

Home Browse Search

SCOPE OF WORK (continued) TASK 03 — LPL CLOSURE ENGINEERING SERVICES Objective This task will encompass the items needed to complete construction of the closure for the existing LPL so that the post -closure period may begin. This includes bid assistance and limited construction services as discussed below. The construction is assumed to be in phases, the first of which is assumed to be in 2025. Included items include the following: The County will have a full-time inspector on site during the construction. The Consultant shall assist in answering construction questions and reviewing submittals and requests for information (RFIs). The Consultant engineer will also attend the pre -construction meeting in person and do one site visit at the end of the project. The County will perform a drone survey before and after construction so that we can demonstrate to DOH and Ecology that the full cover depth has been applied. The County will analyze the survey and submit the information to the regulators. Services During Construction • Responses to RFIs and Submittals • Pre -construction meeting attended by engineer (on site) • Final walk through by engineer TASK 04 — EVALUATION OF BORROW SOILS FOR OTHER USES Objective We understand that Kittitas County Solid Waste is planning to close the Phase 1 area at its Ryegrass LPL and set up a biosolids recycling facility on site. Closure of the Phase 1 area would consist of placement and compaction of a soil cap comprised of two layers: 1) a low permeability barrier soil layer, and 2) an upper vegetative soil layer. Concurrently, the County will be constructing a new transfer station, which will require extensive removal of settlement prone soil. The intent of this geotechnical evaluation is to determine whether the soil removed from the transfer station site will be suitable for use as final cover soil components at the Ryegrass LPL. In addition, representative soil samples will be evaluated by a local agricultural laboratory (SoilTest of Moses Lake, WA) to provide baseline parameters for soil fertility (for the vegetative cover soil layer) and for use in the biosolids recycling process. Activities Herein, we present an abbreviated scope of the evaluation for HWA to perform: • Conduct geotechnical testing on three bulk samples that HWA obtained at the Transfer station site during foundation explorations conducted for the design of the new transfer station. The samples represent soil composited from 3 areas where deep excavations will occur at the new transfer station s ite. • Geotechnical testing will include compaction (proctors), shear strength (direct shears) and remolded permeability. Kittitas County Solid Waste Groundwater Monitoring Well, LPL Closure, Biosolids Expansion 5 September 2023 Area, and Air Permit