Which statistical sampling method targets known contaminant hotspots in a site?

Which statistical sampling method targets known contaminant hotspots in a site?

• A. Simple random
• B. Stratified random
• C. Systematic grid sampling
• D. Hot spot sampling

Answer: (D)

Targeted sampling where the problem is expected to be greatest. When prior data or observations point to specific areas with higher contamination, focusing sampling efforts on those hotspots allows you to quickly characterize the peak concentrations, extent, and potential risk in the most critical zones. This makes the investigation more efficient and informative for remediation decisions. Simple random sampling spreads samples across the whole site without bias toward known problem areas, so hotspots may be missed or undercharacterized. Stratified random sampling gives representation across predefined subareas but doesn’t inherently concentrate effort where contamination is already suspected. Systematic grid sampling covers the site evenly in a pattern, which is good for mapping overall spatial trends but again isn’t aimed at prioritizing known hotspots.

Targeted sampling where the problem is expected to be greatest. When prior data or observations point to specific areas with higher contamination, focusing sampling efforts on those hotspots allows you to quickly characterize the peak concentrations, extent, and potential risk in the most critical zones. This makes the investigation more efficient and informative for remediation decisions.

Simple random sampling spreads samples across the whole site without bias toward known problem areas, so hotspots may be missed or undercharacterized. Stratified random sampling gives representation across predefined subareas but doesn’t inherently concentrate effort where contamination is already suspected. Systematic grid sampling covers the site evenly in a pattern, which is good for mapping overall spatial trends but again isn’t aimed at prioritizing known hotspots.