CEA Soil Contamination Assessment 2

Question 1

Which EPA method is most commonly used for the extraction of semivolatile organic compounds (SVOCs) from soil samples?

Accepted Answer

EPA Method 3550C

Answer

EPA Method 3550C (Ultrasonic Extraction) is the standard extraction method for SVOCs from soil prior to analysis by methods like 8270.

Question 2

A Phase II ESA soil boring reveals petroleum hydrocarbons at 500 mg/kg at 5 feet bgs. The site is in a residential zone. What is the immediate next step?

Accepted Answer

Compare results to applicable state residential soil cleanup standards

Answer

Detected concentrations must be compared to applicable state residential cleanup standards to determine if further action is required.

Question 3

Which parameter best describes the tendency of a contaminant to volatilize from soil into the overlying air?

Accepted Answer

Henry's Law constant (H)

Answer

Henry's Law constant describes the equilibrium partitioning of a compound between the aqueous phase and vapor phase, indicating volatilization potential.

Question 4

What is the purpose of a 'soil background concentration' study during a contamination assessment?

Accepted Answer

To establish baseline levels of naturally occurring substances for comparison with site data

Answer

Background concentration studies establish naturally occurring or ambient levels of substances so that site-related contamination can be distinguished from natural conditions.

Question 5

Soil vapor intrusion risk is GREATEST under which site condition?

Accepted Answer

Shallow groundwater contaminated with chlorinated VOCs beneath a building

Answer

Shallow groundwater contaminated with chlorinated VOCs directly beneath a building maximizes the vapor intrusion pathway to indoor air.

(CEA) Certified Environmental Auditor Practice Test

(CEA) Certified Environmental Auditor Practice Test

CEA Soil Contamination Assessment 2