WAMITAB - Chartered Institution of Wastes Management Landfill Management Operations Questions and Answers

Question 1

A landfill site manager observes that leachate levels in a monitoring well have risen above the maximum permitted level specified in the site's environmental permit.
What is the most critical immediate operational action to take?

Accepted Answer

Increase the rate of leachate extraction from the collection system to lower the level.

Answer

Record the reading and schedule a review for the next weekly meeting.

Answer

Notify the Environment Agency of a potential permit breach within 24 hours.

Answer

Install additional gas wells to see if there is a related pressure issue.

Question 2

Landfill gas is a natural byproduct of the decomposition of organic waste. Which two gases comprise the vast majority (typically 90-98%) of landfill gas?

Accepted Answer

Methane and Carbon Dioxide

Answer

Hydrogen Sulphide and Ammonia

Answer

Oxygen and Nitrogen

Answer

Carbon Monoxide and Sulphur Dioxide

Question 3

According to UK landfill regulations, which of the following waste types is explicitly banned from being accepted at any landfill?

Accepted Answer

Liquid waste, including wastewater but excluding sludge.

Answer

Asbestos waste in a dedicated cell.

Answer

Contaminated soils meeting hazardous WAC.

Answer

Non-hazardous construction and demolition waste.

Question 4

An environmental technician detects a sustained, significant increase in methane concentrations at a perimeter monitoring borehole located just outside the engineered containment system. What is this a likely indicator of?

Accepted Answer

Failure or inefficiency of the landfill gas collection system.

Answer

A recent increase in atmospheric pressure.

Answer

A breach in the surface water drainage channel.

Answer

Successful decomposition within the waste mass.

Question 5

In the construction of a modern landfill's basal lining system, what is the primary function of a Geosynthetic Clay Liner (GCL)?

Accepted Answer

To provide a low-permeability hydraulic barrier to prevent leachate escape.

Answer

To filter fine particles and prevent clogging of the leachate drainage layer.

Answer

To reinforce the side slopes and ensure geotechnical stability.

Answer

To protect the primary geomembrane liner from being punctured by sharp objects.

Question 6

Which of the following activities is a core legal requirement during the aftercare period of a closed landfill site under an Environmental Permit?

Accepted Answer

Continued monitoring and management of landfill gas and leachate.

Answer

Excavating and reprocessing the waste for materials recovery.

Answer

Building residential properties on the capped surface.

Answer

Ceasing all expenditure on the site to prepare for permit surrender.