$1.$ Which of the soil types would be suitable for $($a$)$ liner, $($b$)$ drainage layer, and $($c$)$ gas venting?

a$.$ Gravel $(>2\mathrm{.}5$ cm diameter$)$

b$.$ Glacial till $($K $=10-7$ cm$/$sec$)$

c$.$ Clay $($K $=10-9$ cm$/$sec$)$

d$.$ Silt $($K $=10-6$ cm$/$sec$)$

e$.$ Coarse sand $($K $=0\mathrm{.}1$ cm$/$sec$)$

f$.$ Fine sand $($K $=0\mathrm{.}001$ cm$/$sec$)$

$2.$ Discuss at least two aspects of concern of a municipal waste landfill.

$3.$ Discuss the characteristics of waste that are favorable for biological treatment, thermal

treatment, recycling and landfilling.

$4.$ Calculate the volumetric flowrate of leachate through a compacted clay liner if the area of the

landfill is $21$ ha and the liner thickness is $1\mathrm{.}3$ m$.$ The hydraulic conductivity is $2\mathrm{.}5$x$10-10$ m$/$sec$.$

Assume that the head of water is $0\mathrm{.}8$ m$.$