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Liquids and Landfill Stability – 2021 Solid Waste Webinar Series

July 20, 2021 @ 1:00 pm - 2:00 pm EDT


Presented by Michael Yacyshyn, Eric Chiado, and Tim Mitchell

Accumulation of liquids in a landfill can effect landfill stability.  Management of liquids in a landfill is traditionally limited to the operation and maintenance of the leachate collection and removal system (LCRS) to remove free liquids that drain vertically through the waste mass.  However, some liquids can accumulate in the waste mass and be impeded to flowing to the LCRS due to: excessive stormwater infiltration, varying waste permeability, inconsistent flow patterns, groundwater intrusion into unlined upgradient cells in canyon fills, or varying waste compositions (i.e. wet waste).  Methods to analyze and mitigate the impacts of high landfill liquid levels will be presented.   

Featured Speakers

Michael Yacyhysn, P.E.

Senior Principal

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Mr. Yacyshyn has 41 years of experience in geotechnical engineering, landfill design, consulting, and contracting. He serves as a Senior Principal Engineer in our Nashville, TN office. His experience covers a broad range of civil/infrastructure projects, including hazardous and non-hazardous waste landfills, earth dams, tunnels, retained earth structures, tanks, heavy foundations, and highways. He has gained broad experience in waste management issues over the last 25 years, and has extensive first-hand knowledge of regulatory and technical issues associated with landfill siting, permitting, design, construction and closure. Michael’s experience also includes all aspects of landfill design, including slope stability, settlement, gas control, and surface and groundwater control issues. Prior to Mr. Yacyshyn’s waste management involvement, he was a practicing geotechnical engineer and geotechnical specialty contractor in the western United States for more than 14 years. In addition to his waste management experience, he has designed numerous foundation systems for a wide variety of structures and analyzed existing and proposed slopes for a variety of facilities. He also worked for an international specialty geotechnical contractor who specializes in site improvement techniques for poor ground condition sites.
Eric Chiado, P.E.

Vice President

Eric Chiado
Tim Mitchell, P.E.

Senior Project Manager

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Mr. Mitchell is a Project Manager with CEC, who has 13 years of experience in solid waste engineering. He has engineering experience associated with the design, permitting, and construction of municipal and residual waste disposal, transfer, and processing facilities. He has managed or performed design and/or permitting services for the solid waste industry to include preparation of permit drawings, landfill construction plans and details; analyses and design of landfill liner systems; analyses and design of erosion and sedimentation control systems; slope stability analysis of soils and geosynthetic systems; analysis of solid waste landfill gas (LFG) generation, collection and control systems; and leachate collection, control, storage; and pumping systems. Mr. Mitchell has experience in the preparation of technical specifications for the procurement, installation, and testing of multi-layer geosynthetic/soil landfill liner and cap systems, and large earthworks. He has managed and/or performed construction observations and certification of numerous landfill construction projects related to soil geosynthetic liner system materials; cap systems; leachate collection, pumping and storage systems; gas extraction systems; and erosion and sedimentation control systems. He has prepared regulatory documentation, including record drawings and reports, for approval of state environmental agencies. Additionally, he has provided various engineering support services to waste industry clients including managing and performing forensic investigations for waste mass slope failures.


July 20, 2021
1:00 pm - 2:00 pm EDT
Event Category:


Online Webinar
United States