Question

A layer of local top solid which provisions self-sustaining vegetation should have thickness of ____ cm.

(a) 50

(b) 60

(c) 70

(d) 80

The question was posed to me in my homework.

I want to ask this question from Landfill Disposal Guidelines in section Landfill Disposal of Hazardous Waste Management

Answer 1

Correct option is (b) 60

To explain I would say: A layer of local top solid which provisions self-sustaining vegetation should have thickness not less than 60cm and drainage layer thickness should be 30 cm or more.