Waste Management
Hillside Landfill, TCEQ Permit No. MSW-523B
Grayson County, Texas

Biggs and Mathews has provided professional engineering, hydrogeologic characterizations, and construction phase services at the Hillside Landfill located in Grayson County. 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 stormwater control facilities, access roads, site offices, and entrance 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 with Waste Management and Biggs and Mathews demonstrates a professional commitment to the long-term success of the Waste Management’s Hillside Landfill.

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 Hillside Landfill. The permit projects included civil engineering design, geotechnical engineering, and regulatory coordination. The permit modifications have included revisions to cost estimates for closure and postclosure care and updates to the monitoring systems, groundwater sampling and analysis plan, and site operating plan.

Environmental Services
Biggs and Mathews provided installation of groundwater monitoring wells and 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, usage projections and optimization studies, interim fill and grading plans, and erosion control plans for the Hillside Landfill.  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 new gatehouse and scales and site offices at the Hillside Landfill.

Construction Management
Biggs and Mathews has managed the construction of over $3,000,000 of improvements and development at the Hillside Landfill.  We supported Waste Management with coordinating bids, selecting 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 and construction management services at the Hillside Landfill 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 GCCS troubleshooting and LFG remediation services as necessary at the site.

Drone Services
Biggs and Mathews has collected drone aerial topography data at the Hillside Landfill for the purpose of estimating airspace consumption and waste settlement rates.


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