Couldn't resist commenting on your post... last weekend the "pea soup" with the new students was about 30ft of visibility with about 10 classes going... there is either a higher caliber of student at White Star on the weekends or it is just clearer most of the time (the sediment there settles pretty fast) I will admit though the weekdays are about 60ft of vis which is WAY better.
Hope to see you
Rich
unfortunately, it was at the 'other' quarry not to be mentioned....but I was supporting a DAN event