[Cob] RE:marlin's rubble trench revisited

[Mary Lou McFarland]

One more question about the river rock.  If memory serves me correctly at 
our local concrete plant (the only place around here to buy aggregate) the 
river rock was more expensive than any of the crushed product, so would it 
work out okay to compact the rock than run a layer of urbanite in the trench 
than compact another layer of river rock over that, like a lasagna.  I would 
have to rent a compactor but it would certainly help out on the cost of the 
rock.