Site selection:

The history of the prior usage of the ground is important because of potential hazards. The ground can be a source of contamination by microbial pathogens and harmful chemicals during production particularly if the land has been used for activities other than agriculture.

Information regarding the prior use of the land for grazing animal or animal production is important and can assist in identifying the risk of contamination with microbial pathogens found in the intestinal tract of animals.

If the area is prone to flooding it should also be avoided. Heavy flooding can increase the source of contamination by introducing contaminants from other areas.

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