Waste Management
DFW Recycling and Disposal Facility
Denton County, Texas TCEQ Permit No. MSW-1025B

Biggs and Mathews has provided professional engineering, hydrogeologic characterizations, and construction phase services at the DFW Recycling and Disposal Facility (RDF) located in Denton County since 2000. The professional services provided include permitting, geology and hydrogeology, environmental services, planning, engineering design, and construction management for numerous projects. Projects have included revisions to the permit, construction of liners, leachate collection systems, stormwater control facilities, final covers, access roads, and truck wash facilities. The success of these projects are based on solid communication with Waste Management in the decision process for permitting and design approach and establishing construction budgets. The continued professional relationship between Waste Management and Biggs and Mathews demonstrates a professional commitment to the long-term success of the Waste Management’s DFW RDF.

The Biggs and Mathews project team, consisting of the engineer of record, geologist of record, and geotechnical engineer of record, have prepared numerous municipal solid waste permit modifications for the DFW RDF. The permit projects included civil engineering design, geotechnical engineering, and regulatory coordination. The permit modifications have included revisions to excavation grades, leachate collection system, sequence of development, cost estimates for closure and postclosure care, monitoring systems, the groundwater sampling and analysis plan, site operating plan, and surface water management facilities.

Environmental Services
Biggs and Mathews provided installation of groundwater monitoring wells and landfill gas probes at the site.  We continue to provide comprehensive environmental services including groundwater sampling, analytical laboratory testing, statistical analysis and reporting.

Biggs and Mathews provides routine airspace estimates, airspace usage projections and optimization studies, interim fill and grading plans, and erosion control plans for the DFW RDF.  We also provide evaluations and cost projections for the future development of the waste fill and soil borrow areas.

Engineering Design
Biggs and Mathews has provided engineering design and construction documents for over 10 acres of Subtitle D lined cells and 70 acres of presubtitle D, Subtitle D and alternative water balance final covers at the DFW RDF.  We have also provided the design and construction documents for site improvements such as external and internal roads, drainage facilities, truck wash facilities, and wetland mitigation areas.

Construction Management
Biggs and Mathews has managed the construction of over $10,000,000 of improvements and development at the DFW RDF.  We supported Waste Management with coordinating bids, selection of the contractors and awarding contracts.  During construction we coordinated with the TCEQ, Waste Management, and the contractors.  In addition, we reviewed submittals, issued change orders, resolved conflicts during construction, prepared the final construction reports, and administered the construction contracts.

Landfill Gas Services
Biggs and Mathews has provided landfill gas design/construction management services at the DFW RDF since 2013.  This includes life of site GCCS design and budgeting, design and permitting of GCCS expansions, bidding assistance, construction management, survey, and CQA services during GCCS installations, and preparation of record drawings at the conclusion of each project.  In addition, Biggs and Mathews also assists Waste Management with NSPS compliance, GCCS troubleshooting, and LFG remediation services as necessary at the site.

Drone Services
Biggs and Mathews has collected drone aerial topography data at the DFW RDF to gather data and prepare airspace consumption and waste settlement rate estimates.


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