CPWM - Certified Professional in Waste Management Landfill Design and Operations Questions and Answers

Question 1

A landfill operator is managing stormwater runoff at an active municipal solid waste landfill.
Which of the following is the most critical initial step to prevent surface water contamination and minimize leachate generation?

Accepted Answer

Constructing diversion berms and channels to direct run-on away from the waste disposal area.

Answer

Installing a final vegetative cover over the active cell.

Answer

Combining the stormwater management system with the leachate collection system for efficiency.

Answer

Relying solely on sediment fences and straw bales around the perimeter of the active face.

Question 2

According to RCRA Subtitle D regulations, what is the primary purpose of applying a minimum of six inches of earthen material as daily cover at the end of each operating day?

Accepted Answer

To control disease vectors, fires, odors, blowing litter, and scavenging.

Answer

To provide a stable foundation for the next lift of waste.

Answer

To accelerate the decomposition of organic waste.

Answer

To create a permanent, impermeable barrier to water infiltration.

Question 3

Which two gases are the primary components of landfill gas (LFG) generated during the anaerobic decomposition phase?

Accepted Answer

Methane and Carbon Dioxide

Answer

Oxygen and Nitrogen

Answer

Hydrogen Sulfide and Ammonia

Answer

Volatile Organic Compounds (VOCs) and Water Vapor

Question 4

A new municipal solid waste landfill is being designed. What is the fundamental purpose of the composite liner system at the bottom of the landfill cell?

Accepted Answer

To prevent the migration of leachate into groundwater and underlying soil.

Answer

To promote the rapid breakdown of waste materials.

Answer

To serve as a collection point for landfill gas.

Answer

To provide structural support for the waste mass.

Question 5

A landfill cell has reached its final permitted elevation and is ready for closure. Which component of the final cover system is specifically designed to collect and remove precipitation that infiltrates the topsoil before it can reach the low-permeability barrier layer?

Accepted Answer

Drainage Layer

Answer

Vegetative Layer

Answer

Geomembrane Liner

Answer

Gas Vent Layer

Question 6

When designing a landfill in a seismically active region, RCRA Subtitle D requires specific considerations. The design must demonstrate stability against the ground motion of the:

Accepted Answer

Maximum Horizontal Acceleration (MHA) with a 90% probability of not being exceeded in 250 years.

Answer

Most recent seismic event recorded in the county.

Answer

Maximum Considered Earthquake (MCE) with a 2% probability of exceedance in 50 years.

Answer

Average background seismic activity for the geologic region.

A landfill operator is managing stormwater runoff at an active municipal solid waste landfill.Which of the following is the most critical initial step to prevent surface water contamination and minimize leachate generation?

A landfill operator is managing stormwater runoff at an active municipal solid waste landfill.
Which of the following is the most critical initial step to prevent surface water contamination and minimize leachate generation?