GAP Water Quality & Management 3

Question 1

According to FDA's FSMA Produce Safety Rule, what is the geometric mean (GM) standard for generic E. coli in agricultural water used for direct contact with covered produce?

Accepted Answer

126 CFU/100 mL

Answer

The FSMA Produce Safety Rule sets a geometric mean of 126 CFU/100 mL for generic E. coli in untreated surface water used for direct produce contact.

Question 2

What is the purpose of maintaining a 'buffer zone' or setback between a water source and production fields under GAP?

Accepted Answer

To reduce the risk of surface runoff carrying contaminants from neighboring areas into the water or field

Answer

Buffer zones physically separate the water source or crop from potential contamination sources such as animal operations, roads, or flooded areas.

Question 3

A grower uses well water for irrigation and wants to assess contamination risk. Which site assessment factor is MOST important to evaluate?

Accepted Answer

Proximity of the well to septic systems, animal operations, or latrines

Answer

Nearby septic systems or animal operations are the most significant contamination risk factors for a well because pathogens can travel through soil to the water table.

Question 4

How should water test samples be collected to ensure representative results for GAP compliance?

Accepted Answer

At the point of use, such as the irrigation emitter or spray nozzle output

Answer

Sampling at the point of use captures any contamination introduced within the distribution system and reflects what actually contacts the crop.

Question 5

Which condition most commonly causes spikes in microbial contamination levels in surface water sources used for irrigation?

Accepted Answer

Heavy rainfall events that increase runoff from surrounding land

Answer

Rainfall events mobilize pathogens from animal waste, soil, and other sources through runoff into surface water bodies, causing sudden contamination spikes.

(GAP) Good Agricultural Practices Certified Practice Test

(GAP) Good Agricultural Practices Certified Practice Test

GAP Water Quality & Management 3