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

Soil Vapor Extraction (SVE) is an in-situ technology specifically designed to remove volatile organic compounds (VOCs) and some semi-volatile organic compounds (SVOCs) from the vadose zone. It works by applying a vacuum to the soil, which induces airflow and strips the volatile contaminants from the soil pores. Pump and Treat is used for contaminated groundwater, Solidification/Stabilization is typically used for metals and inorganic contaminants, and Excavation is an ex-situ method.

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

The Record of Decision (ROD) is a public, legal document that explains which cleanup alternative will be used to remediate a Superfund site. It is prepared after the RI/FS and the public comment period on the Proposed Plan. A Preliminary Assessment is an initial step, a Conceptual Site Model is a tool used during the investigation, and an RFI is part of the RCRA Corrective Action process.

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

In-situ remediation treats contaminants in place, which avoids the need for excavation, transportation, and off-site disposal. This significantly reduces site disturbance, lowers the risk of spreading contaminants during handling, and minimizes potential exposure for workers and the community compared to ex-situ methods that require moving the contaminated material. Ex-situ methods often offer faster treatment and greater control, but at the cost of higher disruption and exposure risks.

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

A Permeable Reactive Barrier (PRB) is a passive, in-situ treatment zone of reactive material installed across the flow path of a contaminant plume. As groundwater passes through the barrier, the contaminants are degraded or captured. This method is passive and does not require ongoing pumping. Pump and Treat, Dual-Phase Extraction, and Air Sparging are all active remediation technologies that require continuous energy input to operate pumps or blowers.

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

The RCRA Corrective Action program is designed to address releases of hazardous waste at active and closing facilities that treat, store, or dispose of hazardous waste (TSDFs). In contrast, CERCLA (Superfund) was created to respond to releases at abandoned, inactive, or uncontrolled sites where a responsible party may not be readily identifiable or viable.

CHMM - Certified Hazardous Materials Manager Practice Test

CHMM - Certified Hazardous Materials Manager Practice Test

CHMM - Certified Hazardous Materials Manager Site Remediation Questions and Answers