The sketch plan need not conform to any rigid standards; nevertheless,
it shall include sufficient data to enable the Commission to interpret
and give advice concerning the preliminary plat. It is recommended
that the sketch plan be a simple pencil sketch on a topographic survey
showing the proposed layout of streets, lots and other features in
relation to existing conditions. The sketch plan shall be prepared
by a person professionally trained to execute such a map, and five
copies shall be submitted to the Commission at least two weeks prior
to the meeting at which such plan is to be discussed.