Municipal PCD Draft Credit 4: Landfill Stormwater management (x points)

Intent:

To effectively manage stormwater at a landfill to minimize run-off exposure to waste and production of leachate.

Requirements:

Develop a comprehensive stormwater management plan that

• minimizes stormwater penetration of open and closed cells
• provides for regular inspection of stormwater control measures
• meets the performance objectives of the system described below stormwater management system
• keeping and maintaining comprehensive operations, maintenance, and discharging records

Demonstrate that the landfill has an effective stormwater management system in place to prevent rainwater precipitation from entering the waste, including:

• Landfill must not be sited:
  • in wetlands
  • in the 100-year flood plain of adjacent rivers or streams
• Leachate and stormwater management systems must be separate
• Stormwater run-on must not come within 100 yards of the base of capped or active cells.
• Stormwater runoff must not exit site untreated

Potential Strategies:

• Design of the daily cell to minimize ponding and run-off into the waste
• Maintaining the slopes of the landfill to minimize erosion and increased runoff
• Define existing and intermittent flow channels and the area and characteristics of the contributing watershed;
• Schedule landfilling operations to minimize disturbed areas (i.e., phase-in operations);
• Attempt to limit the handling of topsoil or cover materials to only one operation;
• Construct and stabilize stormwater controls in advance of landfilling;
• Stop flowing water from entering the active fill area with permanent perimeter diversions;
• Establish a complete sequence of controls (i.e. interception, conveyance, transportation, energy dissipation and sediment disposition);
• Use stormwater detention to improve the quality and reduce the intensity of stormwater runoff;
• Plan for the National Pollutant Discharge Elimination System (NPDES) stormwater permit by keeping good operations records and monitoring discharges off the site;
• Avoid, if possible, combining leachate and stormwater management systems;
• Use a surface water collection/ removal (SWCR) system immediately above the hydraulic barrier in the final closure cap. Geonets, geocomposites and/or granular material can be used for this purpose;
• Inspect and maintain controls after each significant storm
• Integrate run-off/run-on and erosion and sediment control into every phase of the landfill operation.

Resource on how to measure/manage stormwater:

https://www.waste360.com/mag/waste_fighting_elements_keys