1. Joseph P. Curro, PE, BCEE Principal Engineer
Elimination of Positive Pressure Under a Landfill Cap Using Flat, Corrugated, Perforated Collector Piping
Boston, MA

4. Quantification of problem
Cap bubbling
Positive pressure under cap
Dead grass
Elevated surface emissions
Odors – high H2S gas
Cap material overlap – not sealed

6. Remediation plan Locate extent of problem Determine best solution
Horizontal gas collector
Choose from collector types
Flat, corrugated, perforated pipe
Cap modification/repairs

7. Flat, corrugated, perforated pipe
Panel pipe
Filter fabric wrapped
Supplied in a roll
Large width / contact surface
Structural strength
Ease of installation
No stone pack required

16. Conclusions Problem-free implementation Speed of installation
Minimal disruption / odors
Thriving grass
Low surface methane emissions
Reasonable cost
Success!