- Landfill Engineering and Environmental Services
Burns & McDonnell has provided engineering and environmental services to the Sheridan Landfill since 2007. Recent services include a rate study, new municipal solid waste (MSW) cell design and contract document preparation, a construction and demolition debris grinding pilot program evaluation, an alternative landfill cover design and permitting, and a solid waste strategic plan. Upcoming solid waste services include MSW disposal expansion permitting, including a hydrogeologic investigation and incorporating bioreactor technology.
- Facility strategic planning
- Expansion permitting
- Construction design and oversight
- Rate study
- Grant application assistance
Construction and Demolition Landfill Permit Application
The city identified an area adjacent to the existing solid waste disposal area for the location of a proposed construction and demolition (C&D) landfill. Burns & McDonnell assisted the city in submitting a permit application to the Wyoming Department of Environmental Quality (WDEQ) to obtain a permit to construct and operate the new C&D landfill. Burns & McDonnell completed project planning and project coordination for the proposed C&D landfill permitting, including schedule creation and management, coordination between project teams and the WDEQ, and general coordination and communication with the city's staff.
Burns & McDonnell prepared a major amendment to the existing solid waste permit, including a summary of the hydrogeologic investigation, an engineering report, drawings and technical specifications. A final application package will be submitted, including a permit amendment report and drawings and technical specifications pending the conclusion of the grinding pilot program.
Cell 10 Feasibility Study
The city identified an area for possible development of a MSW landfill, referred to as Cell 10. Burns & McDonnell performed a conceptual evaluation of Cell 10 to determine the feasibility of MSW landfill development in this area. Two conceptual development options were evaluated, and the feasibility of each one was determined based on these factors: stormwater drainage, depth to groundwater, access, leachate conveyance to existing sanitary sewer, and environmental monitoring system impacts.
Burns & McDonnell prepared a conceptual development memorandum for the city for both options. This included the pros and cons of each option, tentative Cell 10 layout, gross airspace volume calculations, and conceptual opinion of probable initial development cost.
Burns & McDonnell completed a hydrogeologic investigation at the landfill to incorporate comprehensive information into the city's existing monitoring network. Burns & McDonnell oversaw the installation of six monitoring wells and three piezometers, and completed the reporting associated with the installation activities as required by the WDEQ.
Regulatory Variance Request
Burns & McDonnell has completed a location demonstration and variance request per WDEQ requirements for the expansion of the MSW landfill and the development of a C&D landfill. Three variances were required, and Burns & McDonnell worked closely with the WDEQ to facilitate an unbiased and timely review.
Cell 9, Phase II Construction Design
Burns & McDonnell provided services involving the preparation of the construction contract documents for Cell 9, Phase II. Based on the existing topography, Burns & McDonnell prepared a remaining life estimate for Cell 9, Phase I.
Burns & McDonnell is providing assistance to the city during bidding, bid evaluation and bid award. Burns & McDonnell also prepared a construction cost estimate based on the 100 percent complete plan set, and incorporated comments from the WDEQ and the city. Construction quality assurance documentation will be provided.
Construction and Demolition Waste Grinding Pilot Program
Burns & McDonnell is evaluating the effectiveness of a pilot program for grinding C&D waste. Burns & McDonnell will determine the impact of grinding on overall landfill airspace and landfill life. Additionally, a comparison of operation costs will be completed, both with and without the grinding options. Following the calculations, Burns & McDonnell will provide recommendations regarding the future of grinding operations.
Area T6, T7, T8 Evapotranspirative Final Cover
The city has filled T7 and T8 to final waste grades, and phased closure is being planned. As an alternate to the prescriptive final cover, Burns & McDonnell has prepared a permit modification for an evapotranspirative (ET) cover for T6, T7 and T8.
Burns & McDonnell prepared a work plan, which included a cover thickness investigation in areas T6, T7 and T8, as well as a cover soil borrow source sampling and analysis plan. Following the work plan, Burns & McDonnell performed a soil borrow source investigation of the final cover material at the stockpile located south of T6, T7 and T8.
Burns & McDonnell then used the geotechnical information obtained to design the ET cover. The ET model was modeled using Win Unsat-H, to predict ET cover infiltration based on meteorological, soil, and vegetative properties. After the ET cover thickness was determined, a storm water analysis was performed to facilitate proper drainage at the site.
Solid Waste Strategic Plan
The city was interested in developing a strategic plan surrounding its solid waste management system. Burns & McDonnell worked with the city to develop a plan to provide the direction of future solid waste management related to solid waste disposal, construction and demolition debris disposal, recycling and diversion, and municipal collection. The plan projected considerations and decision points for the city over the next 30 years.
Solid Waste Planning
Burns & McDonnell prepared a local integrated solid waste management plan (ISWMP) for the city. The planning effort involved analyzing several local and regional solid waste disposal alternatives over a 20-year period. A regional ISWMP was also developed with two adjacent counties assess the feasibility of a regional landfill. Burns & McDonnell worked closely with the city, members of the public and the WDEQ during the development of the local and regional plans.
Burns & McDonnell prepared a landfill tipping fee and cost analysis for the city in 2011. The project team met with the city project staff to obtain existing information, review ongoing operations at the landfil, and review in detail the desired output from the work effort. Based on this meeting, Burns & McDonnell built a model to take into account the revenue and expense items included in the landfill budget.
These included capital/construction costs for the landfill cells and their closure, landfill operations costs, recycling operations costs, future post-closure costs, debt of service costs, and tipping fee revenues.
Burns & McDonnell used the information as model input to calculate a range of tipping fees required under various scenarios. After the city reviewed and commented on the initial outputs, final adjustments to the model and inputs were made and the final tipping fee projections were calculated. Burns & McDonnell prepared a final report documenting the evaluations and presenting the projected tipping fee requirements to the city.
The city is implementing and improving several recycling programs. Burns & McDonnell completed a subsurface investigation and design for a potential household hazardous waste building.
Burns & McDonnell has also been involved in preparing grant applications to aid in improving the city's existing recycling program.