Sino Agro Food Inc (fka SIAF)

[melehuna]

IIRC, there were four open ponds, with liners and visible filtration equipment. Two were inside the gate, and two others were just outside the buildings containing the indoor tanks. The latter two ponds mirrored one another - symmetrical with walkways all around and through the middle. I posted a couple of photos (plus the entry gate) here:

http://www.flickr.com/photos/88032963@N07/sets/72157631689278144/

I'm not certain why the pond liners are used. The surrounding area clearly has a high water table (unpaved ponds or canals everywhere around), yet PF2's ponds are already constructed of concrete, so why another barrier or liner? How would it prevent contamination? Someone more technical than I may have the answer.