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To the water conditions
Plan
Layer 1 --- herb / vegetable
Layer 2 --- about 12 inches loam (fine and pond scum)
Layer 3 --- about 2 inches of sand
Layer 4 --- about 4 inches Dills
Layer 5 --- about 12 inches pit
Layer 6 --- take down drains
Layer 7 --- Ground Bottom drains - out to sea
Example In 2009 Lee Kau Yan School Construction Supplies
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