CGM Remediation & Mitigation Strategies 4

Question 1

What is 'thermal desorption' as a soil remediation technology?

Accepted Answer

Heating contaminated soil to volatilize organic contaminants for off-gas treatment

Answer

Thermal desorption heats excavated or in-situ soil to temperatures that volatilize organic contaminants, which are then captured and treated in a separate off-gas system.

Question 2

A grounds facility has chronic bare soil areas under dense tree canopy. Which long-term mitigation strategy is most sustainable?

Accepted Answer

Applying mulch and establishing shade-tolerant groundcovers

Answer

Mulch suppresses weeds and retains moisture while shade-tolerant groundcovers eventually stabilize the area without competing unsuccessfully with tree roots for light.

Question 3

Which regulatory framework most directly governs the cleanup of contaminated sites in the United States?

Accepted Answer

Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA/Superfund)

Answer

CERCLA, commonly known as Superfund, authorizes the federal government to respond to releases of hazardous substances and compels responsible parties to clean up contaminated sites.

Question 4

What is a 'permeable reactive barrier' (PRB) used for in groundwater remediation?

Accepted Answer

A subsurface wall of reactive material that treats contaminated groundwater as it flows through

Answer

A PRB is installed perpendicular to groundwater flow; as contaminated water passes through the reactive medium (e.g., zero-valent iron), contaminants are degraded or immobilized.

Question 5

Integrated Pest Management (IPM) serves as a mitigation strategy primarily by:

Accepted Answer

Reducing pest pressure through combining cultural, biological, and chemical controls to minimize environmental impact

Answer

IPM combines multiple tactics in a decision-based framework to manage pests effectively while minimizing pesticide use and environmental risk.

(CGM) Certified Grounds Manager Practice Test

(CGM) Certified Grounds Manager Practice Test

CGM Remediation & Mitigation Strategies 4