Table 1.

Experimental plan and description of non-food-contact sample sites over 2 years within three tree fruit packinghouses (P1, P2, and P3).

Area	No. of samples	Description of sampling sites
Cold storage	11	Floors, floor cracks and seams, and foot of fruit storage bins
Packing line	25	Bin loading/unloading equipment, top rim of dump tank, cull bins, equipment over brush bed (spray bars, apple flow partitioning dividers, and structural supports), and equipment under brush bed (drip pans, drip pan drainage funnels, brush scraper bars, structural supports, and floors) Potential cross-contamination sites: high traffic floors, catwalks, drains, and forklifts
Packaging line	4	Sorting/grading equipment, packaging equipment, and floors
Total	40