3tbs
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Since one foot is 12 inches a four percent slope is .04X12 = 0.48 inch drop
You need (8 x (520/1000)) lbs ie 4.16 lbs so you only need 1 bag but won't use much more than half of the contents.
Quite possibly 512 cubic inches!
5 lbs at 1/4 inch joint.
Acidic like gardenia and ixora.