7.9 Connection to Title Boundaries
The alignment of all 'as constructed' works must be related to title boundaries and road alignments by means of offsets and ties.
Where Works are a significant distance from title boundaries or road alignments and have been co-ordinated, the 'as constructed' MGA94(z55) co-ordinates should be recorded for both the start and finish of Works. If Works have not been co-ordinated and it is impracticable to relate to road/title boundaries by offsets and ties, bearings and distances to nearest intersecting title boundaries should be recorded for the purpose of locating the start and finish of the Works. All appropriate information must be annotated on the original design plans and be clearly distinguished from design offsets and ties, by prefixing the characters "A/C" (i.e. A/C 2.4).
Offset distances and tie distances must be quoted to one decimal place of a metre, with an accuracy tolerance being set at +/- 0.10m in respect to the adopted title boundary and be shown at all critical points, such as at manholes, changes in alignments, tangent points and road intersections. Where the associated subdivision has been co-ordinated then MGA94(z55) co-ordinates must be supplied for all manholes, outlet/inlet structures, tangent points, changes in alignment and appropriate title corners to verify the relationship between asset and title.
Dimensions that relate the asset to a title boundary must be certified by a licensed surveyor on the annotated original design plan (e.g. Pipelines within an easement would require relationship to title and therefore a licensed surveyor's signature, whereas a wetland within a reserve does not necessarily require a licensed surveyor's signature).
Note: The 'as constructed' asset is positioned within Melbourne Water's Geographical Information System relative to VicMap Property using offsets and ties. The actual MGA94(z55) co-ordinates are stored as attributes to ensure there is no loss of data integrity, especially where VicMap Property is only captured to an accuracy of 1:2500.
