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This project will contribute to understanding when does the regulatory aftercare or PCC period at a closed municipal solid waste (MSW) landfill end which a specific focus on slurry-wall landfills. The primary goal of this study is to understand the extent of groundwater impacts and evaluate the appropriate PCC period for SW landfills. The specific objectives of this study are (1) collect and compile groundwater quality data and leachate pumping and quality data from SW landfills, (2) statistically assess the long-term trends in the collected data at SW, (3) use the data analysis tools capable of determining when and how landfills meet regulatory limits with and without climate change impacts, and (4) modelling contaminant transport through the slurry (in the event that leachate pumping is optimized or stopped).
Task 1: State of Practice of Florida Slurry-Wall Landfills
Task 1: State of Practice of Florida Slurry-Wall Landfills
Compile operational data including leachate (if applicable), landfill gas, and groundwater quality data.
Data from these sites will be summarized to provide regulators and industry with a state of practice on how SW landfills are currently performing.
These data will be used to understand the state of practice of SW landfills from each site during the PCC period.
Task 2: Analysis of Groundwater and Leachate Quality
Task 2: Analysis of Groundwater and Leachate Quality
Analysis and Summary of Groundwater Quality
Detected parameters will be summarized by mean, median, mode, number of hits for each well, and determine if there is statistically significant indication of contamination (US EPA, 2009).
Statistical trend analysis (Stoline, 1993) will be completed for all detected parameters to estimate the changes in concentration over time and project concentrations in the future.
Task 3. Comparing Groundwater Quality Trends to State and Federal Regulatory Limits
Task 3. Comparing Groundwater Quality Trends to State and Federal Regulatory Limits
Data will be compared to:
Minimum Criteria for Ground Water (62-520.400, F.A.C.),
Primary or Secondary Drinking Water Standards (62- 550.310, F.A.C. and 62-550.320, F.A.C.), or
Ground Water Cleanup Target Levels (62-777.170(1)(a), F.A.C.).
Landfill gas and leachate quality (where applicable) will be correlated to groundwater quality to develop performance indicators that will be coupled to provide more comprehensive performance indicators.
Task 4. Developing Tools for Projections for PCC Periods in the Context of Climate Change
Task 4. Developing Tools for Projections for PCC Periods in the Context of Climate Change
Climate-change sensitivity assessment to evaluate the likelihood for the climate change hazards of concern to reduce effectiveness of existing post closure monitoring activities.
Simulations will be performed on slurry wall landfills to introduce climate change “boundary conditions” on these facilities using the developed tools to determine how and when landfills will meet PCC regulatory limits.
Task 5. Investigating contaminant transport through the slurry wall
Task 5. Investigating contaminant transport through the slurry wall
Modelling contaminant transport through the slurry (in the event that leachate pumping is optimized or stopped)
Business as usual (inward gradient +1 ft)
No gradient
Outward gradient (-1 ft)
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