On 11/5/10 11:05 AM, Richard Mann wrote:
Gravel/sand/clay come from river beds, generally. Quarries are when
you blast half a hill away.
But I'm not an engineer...
gravel around here comes from excavating in the sides of hills
that are actually piles of debris left by glaciers in a previous ice
age.
in the southeast US, clay comes from pretty much anywhere you
use a shovel.
richard
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