$($a$)$ The following analysis was obtained on samples from different source water supplies that could be used as raw water to a drinking water treatment plant.

$($i$)$ Indicate the likely nature of each of the sources $($is it ground water or river water, treated effluent, etc.$)$ and give reasons for your answer. $(9)$

$($ii$)$ Assess the quality of each source as feed water to a drinking water treatment plant. Identify the constituents that need to be adjusted to make the source water fit for drinking water, and name suitable treatment processes $($give motivation for your selection$)$ that could be employed to make each supply fit for human consumption and also chemically stable. $(12)$