As current staff at the same grade, I can say that 10k is about the middle of the salary band (slightly above the mid-way mark). So if that is the pay grade they are offering you, then 10k is not unreasonable, provided you are either very capable or have many years of relevant experience.

If you are a civil servant, NUS E&P Grade 3 (Associate Dir designation) is roughly equivalent to to MX10 on the MX salary scale.