Fred Weber Landfill
Location: St. Louis County, Mo.
Client: Fred Weber Inc.
The Fred Weber Sanitary Landfill is a 78-acre facility located in a 200-foot deep limestone quarry. For this existing facility, Burns & McDonnell has designed a gas monitoring system, provided technical assistance for permitting and construction of individual cells, and designed components of a gas migration control and recovery system.
Burns & McDonnell currently provides semi-annual groundwater monitoring, landfill gas compliance monitoring, construction quality assurance of the compacted sidewall soil liner, and general on-going consulting services, as needed. In 2000, Burns & McDonnell designed and permitted a 154-acre expansion to the landfill that provides approximately 66.5 million cubic yards of refuse disposal capacity.
Several subsurface investigations have been conducted to collect geologic and hydrogeologic information on the existing and proposed expansion areas of the landfill. The investigations have included rock and soil drilling, in-situ hydraulic conductivity testing, monitoring well installation and well development. Several bedrock wells have been installed to depths in excess of 250 feet. The results of the investigations were used to characterize the site in sufficient detail to provide data for the design and operation of an environmentally sound landfill facility.
Burns & McDonnell developed the groundwater monitoring plan for the Fred Weber Sanitary Landfill. The groundwater monitoring plan summarizes the geologic and hydrogeologic data, details the monitoring well system, and provides other relevant background information. The plan provides direction for the field sampling, laboratory analysis, reporting, data validation and statistical analysis. The plan was developed in response to requirements of Subtitle D of the Resource Conservation and Recovery Act.
Burns & McDonnell provides semi-annual groundwater monitoring services for the Fred Weber Sanitary Landfill. A team of professionals experienced in groundwater issues join their efforts to complete the variety of tasks associated with routine groundwater monitoring. These tasks include field sampling, laboratory data validation, statistical analysis and reporting.
Beneficial Use of Landfill Gas
Burns & McDonnell has conducted a technical feasibility study for increasing the supply of landfill gas (LFG) provided to an on-site asphalt plant's aggregate dryer. The study determined that LFG could be used to supply at least three-fourths of the fuel for the 80 million BTU/hours dryer without replacement of the existing dual-fuel burner. Redesign specifications included a larger gas blower, and modification to the dual-fuel burner and the gas piping system. Recommendations were made for upgrading the collection system and for additional gas collection wells.
In 1999, Burns & McDonnell completed the construction specifications for several modifications to the existing LFG utilization system. The goal of these modifications was to maximize the usage of the existing gas blower, which had originally served only the aggregate dryer. By modifying the gas transmission pipeline, implementing LFG cleanup and odor injection equipment, and installing safety controls, Weber was able to supply LFG to the asphalt plant's hot oil boiler, to on-site greenhouses and to the nearby high school's hot water boiler. As a result, the high school will realize approximately $35,000 per year in fuel savings. The plans and specifications were submitted to the Missouri Public Service Commission to demonstrate compliance with state safety standards.
The Fred Weber Landfill routinely installs a compacted sidewall soil liner in advance of raising the landfill elevation within the 200-foot deep limestone quarry. Burns & McDonnell provides the field testing and construction oversight to assure the soil liner is constructed in accordance with the liner specification. The liner placement criteria was developed after extensive laboratory testing to determine the moisture/density relationship necessary to meet the hydraulic conductivity requirement for the compacted soil liner. The inspector follows the Construction Quality Assurance (CQA) plan prepared by Burns & McDonnell geotechnical engineers.
Burns & McDonnell designed and permitted the 154-acre North Pit Expansion of the Fred Weber Landfill to provide the largest single site disposal capacity in the State of Missouri. The design includes a groundwater underdrain system that will operate in perpetuity to ensure that groundwater in the area of the landfill is below the landfill liner. The expansion site is divided into seven disposal areas, each of which is provided with a system to collect leachate and remove it from the excavated quarry pit over 200 feet deep. Operation of the North Pit Expansion began in 2005.