*EXAMPLE: the volume of sand required for aggregate around a 6.6m diameter tank: *

A. Calculate the tank footprint area i.e. 6.6m diam. (pi x r²) 3.14159 x 3.3 x 3.3 = 34.2m²

B. Calculate the area of the sand pad footprint i.e. 8.6m diam. 3.14159 x 4.3 x 4.3 = 58.0m²

C. C = Area of the aggregate footprint: B minus A = C 58m² – 34.2m² = 23.8m²

D. Volume (100mm deep) aggregate required: C x 0.1m 23.8m² x 0.1m = 2.38m³ (order 2.5m³)

**Order 2.5m³ (rounded off) of aggregate**