CHMM - Certified Hazardous Materials Manager Site Remediation Questions and Answers

Question 1

A site is contaminated with volatile organic compounds (VOCs), such as trichloroethylene (TCE), primarily within the unsaturated (vadose) zone.
The contamination is relatively shallow and widespread.
Which of the following in-situ remediation technologies is most commonly selected and effective for this specific scenario?

Accepted Answer

Soil Vapor Extraction (SVE)

Answer

Pump and Treat

Answer

Solidification/Stabilization

Answer

Excavation and Off-site Incineration

Question 2

In the CERCLA (Superfund) process, which key document is issued after the completion of the Remedial Investigation/Feasibility Study (RI/FS) to formally select the remedy for a contaminated site and provide the legal basis for the cleanup action?

Accepted Answer

Record of Decision (ROD)

Answer

Preliminary Assessment (PA)

Answer

Conceptual Site Model (CSM)

Answer

RCRA Facility Investigation (RFI)

Question 3

Which of the following represents a primary advantage of using in-situ remediation technologies over ex-situ technologies for treating contaminated soil?

Accepted Answer

They minimize site disruption and potential worker exposure from handling contaminated media.

Answer

They typically achieve cleanup goals in a shorter timeframe.

Answer

They offer greater control over environmental variables like temperature and pH.

Answer

They are universally effective for all contaminant types, including non-volatile metals.

Question 4

A remediation manager needs to address a plume of dissolved chlorinated solvents in groundwater that is slowly migrating. The goal is to install a passive, long-term treatment system that cleans the water as it flows through a subsurface treatment zone without continuous energy input. Which technology best fits this description?

Accepted Answer

Permeable Reactive Barrier (PRB)

Answer

Pump and Treat

Answer

Dual-Phase Extraction

Answer

Air Sparging

Question 5

What is the fundamental difference in applicability between the RCRA Corrective Action program and the CERCLA (Superfund) program?

Accepted Answer

RCRA Corrective Action applies to operating or recently closed hazardous waste treatment, storage, and disposal facilities (TSDFs), while CERCLA addresses abandoned or uncontrolled hazardous waste sites.

Answer

CERCLA is a federally managed program, whereas RCRA Corrective Action is exclusively managed by individual states.

Answer

RCRA Corrective Action is used for petroleum releases only, while CERCLA is used for all other hazardous substances.

Answer

Only CERCLA sites are eligible for placement on the National Priorities List (NPL).

Question 6

A site remediation plan calls for the use of bioaugmentation to treat soil contaminated with a specific, persistent industrial chemical. Which of the following activities does bioaugmentation involve?

Accepted Answer

Introducing specific, pre-cultured microorganisms into the contaminated soil to enhance the degradation of the target chemical.

Answer

Adding nutrients like nitrogen and phosphorus to stimulate the growth of existing native microorganisms.

Answer

Planting specific types of vegetation that can absorb and break down the contaminant.

Answer

Injecting air into the subsurface to increase oxygen levels for aerobic biodegradation.