- Comprehensive Landfill Services
Since 2007, Burns & McDonnell has provided full-service engineering, environmental, and planning services for the three landfills and transfer station owned by Campbell County, Wyoming. Landfill No. 1 is a closed landfill with ongoing operation, monitoring, and maintenance needs. The transfer station is also located at Landfill No. 1. Landfill No. 2 is an active municipal solid waste landfill and Landfill No. 3 is a construction and demolition (C&D) debris landfill. Among the major projects completed:
- Groundwater sampling, statistical analysis and reporting since 2007
- Landfill gas monitoring and active landfill gas system reporting, evaluation, and operation and maintenance assistance since 2007
- Engineering design and permitting for a horizontal and vertical expansion of Landfill No. 3; the expansion was approved in 2013
- Engineering design and permitting of a 20-acre expansion of Landfill No. 2, a municipal solid waste (MSW) landfill, in 2008
- Engineering design and permitting of a 55-acre expansion of Landfill No. 2 in 2016
- Detailed design, construction services and construction quality assurance (CQA) services for an 8-acre cell and new leachate pond at Landfill No. 2 in 2010
- Detailed design, construction services and CQA services for an 11-acre cell expansion and leachate evaporation system at Landfill No. 2 in 2015
- Renewal applications of operations permits for landfills No. 2 and No. 3; in 2016, a “lifetime” permit was obtained for Landfill No. 2 that set forth the landfill design, development, operations and closure requirements for the next 25 years
- Comprehensive hydrogeological investigation of data gaps at Landfill No. 2 in 2015, including approximately 40 borings
- Development of a sitewide water balance cover design in 2015 to be used throughout Landfill No. 2
- Detailed design of a water balance cover final closure for Phase I and portions of Phase II and Phase IIIE in 2016
- Detailed design of the reclamation/closure of Phase I of Landfill No. 3
- Monitoring well and landfill gas well installation
- Integrated solid waste planning
- Landfill cost of service study in 2009
- Transfer station permit renewal in 2011
- Preparation of landfill contamination nature and extent (N&E) investigation work plans for landfills No. 1 and No. 2
- Solid waste management
- Document preparation
- Construction oversight
- Regulatory negotiation
Additional hydrogeologic information was needed before permitting the MSW landfill expansion at Landfill No. 2. Burns & McDonnell oversaw the installation of three monitoring wells and four piezometers and completed the reporting associated with the installation activities as required by the Wyoming Department of Environmental Quality (WDEQ).
In summer 2009, Burns & McDonnell installed three monitoring wells at Landfill No. 1 to further assess the site's groundwater quality at the closed landfill. Ten methane probes were installed to evaluate the existing landfill gas extraction system. In spring 2011, Burns & McDonnell installed four additional monitoring wells at Landfill No. 1 to assess the site's groundwater quality.
Permitting and Design
Water Balance Cover (Evapotranspiration [ET] Cover)
An ET cover was designed and permitted for all of Landfill No. 2. After performing a borrow source investigation to determine soil suitability, WinUnsat-H software and published methodologies were used to evaluate the required thickness of the future vegetative cover. Main parameter inputs include meteorological data, soil properties and plant properties. Burns & McDonnell worked closely with the local Natural Resource Conservation Service (NRCS) office to select native vegetation that will enhance vegetative cover performance and thrive in the county's arid climate. An innovative approach to evaluating all potential soil types on-site was used to determine the required cover thickness for a range of soil types.
A lysimeter was designed and will be installed to monitor the cover performance. A lysimeter operations and maintenance (O&M) plan was created for the landfill operators to establish monitoring and maintenance protocol. Storm water modeling and design was included in the permit documents.
MSW Landfill No. 2
Burns & McDonnell prepared the landfill operating permit application and associated engineering drawings to expand the MSW landfill life by approximately 65 years. Features of the expansion include a composite liner system, leachate collection, a leachate force main, and storm water management as well as site development sequencing and phased closure requirements.
C&D Landfill No. 3
Burns & McDonnell completed a permit update for the existing C&D landfill in spring 2009 and again in 2015. Burns & McDonnell completed a major permit amendment for a horizontal and vertical expansion to the existing C&D landfill to accommodate future waste disposal in the fall of 2011. The horizontal and vertical expansion provides additional capacity for approximately 9.1 years of waste disposal.
Burns & McDonnell prepared the bid documents for the C&D landfill expansion and provided the county with assistance during the bidding phase of the project. Burns & McDonnell will also provide construction phase services including submittal review and preparation of record drawings.
Burns & McDonnell completed a permit renewal application for the existing transfer station located at Landfill No. 1 in spring 2012. The previous permit renewal application included the transfer station and Landfill No. 1, but since the County is pursuing closure for Landfill No. 1, Burns & McDonnell prepared the permit renewal application for the transfer station only.
Landfill No. 1 Remediation and Closure
Burns & McDonnell prepared a N&E work plan to investigate the contamination on site. The investigation is planned for the second half of 2016. After completion of the investigation, an active landfill gas system, landfill cover retrofit, and possibly groundwater remediation will be completed. We will also prepare a CQA report to demonstrate to the WDEQ closure construction was completed in substantial accordance with the closure permit accepted in 2004.
Burns & McDonnell performed construction management and CQA services for several projects at landfills No. 2 and No. 3. This includes preparing construction documents and associated engineering drawings and providing the county with assistance during the bidding phase of the projects. Burns & McDonnell also provided construction phase services including field oversight, approval of submittals and CQA.
Solid Waste Planning
Burns & McDonnell prepared a local integrated solid waste management plan (ISWMP) for the county. 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 county, members of the public and the WDEQ during the development of the local and regional plans.
Solid Waste Strategic Plan
Burns & McDonnell prepared a solid waste strategic plan for MSW, C&D and recycling operations. The plan addressed the optimizing existing assets and strategically plan for the future. Burns & McDonnell worked with an appointed advisory committee, the public and the county during the development of this plan.
Solid Waste Rate Study
Burns & McDonnell prepared a solid waste rate study which identified current and future solid waste utility costs and revenues over a 20-year planning period to determine a recommended tipping fee at the landfill along with proposed increases in the tipping fee through 2028.
Groundwater and Landfill Gas Monitoring
Burns & McDonnell provides groundwater and general environmental compliance-related monitoring, statistical analysis and reporting services for landfills 1, 2 and 3. Included is quarterly and semi-annual groundwater reporting for all three, monthly and quarterly methane monitoring for landfills 1 and 2, and annual environmental monitoring report to address the status and performance of the active gas collection system at Landfill No. 1. Additionally, operation and maintenance support of the active landfill gas system at Landfill No. 1 is provided.