14. A soakage trench would be appropriate under the same conditions as a:
Deep pit latrine.
15. Grease traps are constructed on the principle that:
Fats are soluble in water.
Fats are lighter than water.
Fats and oils pass readily through porous materials.
Fats and oils separate readily from liquids when hot.
16. Which kitchen liquid waste disposal should be used if the soil is not sufficiently
porous and the air is dry?
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